Therapeutic Management: When and What

Migraine is a widespread brain disease that is classified as the second most disabling condition and has the third highest prevalence of all medical conditions. Despite its non-emergent or life-threatening nature, migraine can progress to chronic type, a subform associated with significant morbidity and drug overuse. In the management of migraine, it is important therefore to introduce early prophylactic treatment in order to limit migraine chronification. In this chapter, we will go through all the treatment options, both acute and preventive, pharmaceutical and non-pharmaceutical following this flowchart: 1. Introduction; 2. General principles; 2.1 Symptomatic therapy; 2.2 Prophylactic management; 3. Pharmaceutical therapies; 3.1 Symptomatic; 3.1.1 Disease-specific; 3.1.2 No disease-specific; 3.2 Prophylactic; 3.2.1 Disease-specific; 3.2.2 No disease-specific; 3.3 Non-Pharmaceutical therapies; 3.4 Neuromodulation; 3.4.1 Invasive; 3.4.5 Noninvasive; 3.5 Nutrient (nutraceuticals); 3.6 Dietary interventions; 3.7 Acupuncture; 3.8 Physical therapy; 5. Patient centricity and patient education.


Introduction
The last decade heralded a new era in migraine therapeutics, with the emergence of novel targeted therapies. Recent advances in the field of migraine research have resulted to newly available acute and preventive treatment options, including gepants (calcitonin gene-related peptide (CGRP)-receptor antagonists), anti-CGRP/R monoclonal antibodies (mAbs), and ditans (5-HT 1F receptor agonists). Several advances were also achieved in non-pharmaceutical therapeutics, with the advent of devices for vagus nerve stimulation (VNS), external trigeminal nerve stimulation (eTNS), and transcranial magnetic stimulation (TMS) [1]. This chapter provides a comprehensive overview of available therapeutic approaches in migraine (pharmaceutical and nonpharmaceutical), summarizing both acute and prophylactic options.
The therapeutic management of migraine is multidisciplinary, including both pharmaceutical and non-pharmaceutical approaches. The choice of pharmaceutical treatment should be individualized, taking into consideration the characteristics of the migraine attack, the patients' comorbidities, and treatment preferences [2, 3].
The symptomatic migraine treatment aims to rapidly relief headache, restore function, and prevent recurrence. To date, simple analgesics, nonsteroidal anti-inflammatory drugs (NSAIDs), and triptans are the most widely prescribed medications for acute migraine [1]. Triptans (selective serotonin 5-HT 1B/1D receptor agonists) have shown to inhibit the release of calcitonin gene-related peptide (CGRP) and were first approved for acute migraine therapy in the early 1990s [4]. However, these drugs are not efficient in all patients and might have vasoconstrictive properties that could be a contraindication [1], leaving room for new, disease-specific symptomatic treatments. The development of two novel classes of drugs, gepants (CGRP receptor antagonists) and ditans (serotonin 5-HT1F receptor agonists), for the symptomatic treatment of acute migraine allows management of patients that do not tolerate or respond to the above agents [1].
Every year about 3% of patients convert from episodic to chronic migraine (≥15 headache days per month, of which ≥8 migraine days) [1]. It is important therefore to introduce early prophylactic treatment in order to limit migraine chronification. The calcitonin gene-related peptide (CGRP) antagonists were approved in 2018 and represent the first class of novel targeted medications specifically designed and approved for migraine prevention. The newly approved monoclonal antibodies against the ligand CGRP or its receptor (anti-CGRP/R mAbs) are fremanezumab, erenumab, and galcanezumab, while eptinezumab is waiting for approval in 2020 [5]. Ubrogepant, lasmiditan, and rimegepant are emerging acute migraine therapies that are also waiting to be added to the arsenal of current migraine management [6].
The use of non-pharmaceutical approaches is recommended as adjunct therapy or as alternative to the first-line pharmaceutical treatment [7,8]. Complementary interventions are used to minimize the overuse of acute pain medication or adverse effects (AEs) and as alternative when preventive pharmaceutical therapy fails or is contraindicated. Non-pharmaceutical strategies suggested include approved devices for migraine, cognitive behavioral therapies, physical therapy, improving quality of sleep, acupuncture, and dietary solutions [9][10][11].
Overall, novel therapies signify a paradigm shift in migraine management and not only bring new hope to patients suffering for migraine but also change the clinician's approach to the treatment of migraine [1]. While migraine therapy is currently undergoing tremendous development, unmet needs of patients remain, which, if addressed, have the potential to further enhance available treatment options and improve the quality of life of migraineurs. Identification of predictive biomarkers for responders and nonresponders to therapies, and elucidation of underlying migraine pathophysiology are still lacking, and are essential for the development of novel therapeutic targets and individualized migraine prevention.

General principles
To date, there is no cure for migraine, but migraine can be successfully treated in many cases.
Therefore, education of patients is of great significance. This could be achieved by thoroughly explaining patients' disorder, purpose, and means of management. Patient information leaflets on migraine and management are available from the Headache Federations (Lifting The Burden) [12]. Prior to treatment and during follow-up assessments, patients should be monitored and evaluated using recommended assessment tools: the HALT-30 Index that assesses burden in terms of lost productive time, the Migraine Disability Assessment Test (MIDAS), the Headache

Symptomatic therapy
When migraine attacks are not severe or disabling for less than 4 days per month, only symptomatic therapy is considered [2]. It is important to know when to treat a migraine attack and which therapy and route of administration are preferred, especially in patients experiencing nausea and vomiting. Generally, patients are advised to receive the abortive treatment as early as possible in the attack to reduce the intensity and duration of migraine as well as the accompanying features. In case of an inadequate response, it can be repeated after two hours (same or other treatment). There is a restriction on the duration of usage of symptomatic treatment due to the probability of developing medication overuse headache (MOH). Thus, taking into account the criteria of ICHD-III [19], intake of symptomatic treatment should not exceed 10 days per month for ergotamine, triptans, or combinations of drugs, or 15 days per month for NSAIDs, paracetamol, and aspirin.
Non-opioid analgesics (eg. NSAIDs, aspirin and paracetamol, or combinations with caffeine) with the addition of antiemetics (if needed), are the first-line treatment for mild to moderate attacks. Analgesics should be administered early in the attack and in adequate dosage, and during the aura phase for the case of migraine with aura. When vomiting is present, rectal forms of analgesics and use of antiemetics might be suggested. It is noted that paracetamol (1 g) on its own has lower efficacy and it should not be considered as first-line treatment alone. Opioids are thought to be ineffective and potentially addictive; thus, they should be avoided [12].
Triptans are recommended as first-line treatment for patients with moderatesevere migraine attacks, or where analgesics failed. Triptans are more effective when administered while headache is mild, but their use during aura is controversial for safety reasons. Combination therapy using triptans and NSAIDs should also be considered when triptans alone are not efficient to control migraine attacks. Subcutaneously injected sumatriptan (6 mg) should be considered when every other symptomatic treatment has failed, as a rescue medication. Triptans are associated with recurrence of migraine attack within 48 hours in up to 40% of patients that responded and with moderate consistency of efficacy across the attacks. Triptans should be avoided in uncontrolled hypertension, coronary heart disease, cerebrovascular disease or peripheral vascular disease, multiple risk factors for coronary or cerebrovascular disease. Finally, the use of triptans in the elderly should be with great caution due to comorbidities, preferably by headache specialists [12]. There are many strategies from stratified treatment to individual/tailored approach [20]. We suggest that a tailored approach is better as many subgroups of migraineurs exist and many patients exhibit adverse event in one or more therapies [12,21]. All pharmaceutical symptomatic treatment is summarized in Table 1.

Prophylactic management
Preventive treatment of migraine attacks is recommended when attacks are severe or frequent (more than 4 days per month) or there are contraindications, adverse effects, failure, or inadequate response of proper use of acute medication. The aim is to reduce frequency, duration, and severity of attacks and conversely increase the effect of acute treatment. The most important in preventive treatment of migraine is to know when to start the treatment and to manage and monitor the migraine patient, so that the disease does not switch from episodic to chronic, a subform associated with significant morbidity and drug overuse [22] and/or complicate with medication overuse headache (MOH). Today, we have both pharmaceutical and non-pharmaceutical (devices, nutrients, etc.) treatment options in our arsenal.
Drugs that appear ineffective should be discontinued only after 2-3 months at minimum, in order to achieve and observe efficacy. Failure of one drug does not predict failure of others in a different class. Tapered withdrawal may be considered after 6 months of good control, and should be considered no later than after 1 year [12]. To increase adherence, it is recommended to start with a low dose and slowly increase the dosage to the preferable one.
The anti-CGRP/R monoclonal antibodies have demonstrated good efficacy and excellent tolerability in phase II and III clinical trials with only injection site reactions to be the most common treatment-related adverse events [22].
The available treatments have different efficacy and adverse events/contradictions, and each option must be individualized and tailored in the patient's profile and needs. All pharmaceutical prophylactic treatment is summarized in Table 2.

Pharmaceutical therapies
As previously stated, the pharmaceutical treatment of migraine is divided into symptomatic/acute (to stop the migraine crisis and alleviate the concomitant symptoms, e.g., nausea, vomiting) and preventive/prophylactic (to reduce the frequency, intensity, and severity of the attacks). Drugs from both categories are further divided into substances that have been designed specifically for migraine and to drugs that are used primarily for the treatment of other diseases (non-specific).

Ergots
Ergotamine and dihydroergotamine are the two main drugs of this category, and they exert their action via activating 5-HT1B/D receptors located on intracranial blood vessels. They also have affinity for dopamine and noradrenaline receptors [2]. Evidence shows that dihydroergotamine is more effective than ergotamine. DOI: http://dx.doi.org/10. 5772/intechopen.93096 Nowadays, there are some preparations of ergotamine and dihydroergotamine alone or in combinations (usually with antiemetics or caffeine) [23,24]. Ergots can also induce medication overuse headache (MOH) with very low doses and their use must be limited to less than 10 days per month. Contraindications are coronary artery disease due to the constriction of the coronal vessels [25], arterial hypertension, and cerebrovascular diseases. Due to their impact on the vascular system, they should not be used in combination with other vasoconstrictor drugs. Other contraindications include Raynaud disease, renal or hepatic failure, pregnancy, and lactation.

Dihydroergotamine (DHE)
It is available for oral, intravenous (IV), intramuscular (IM), subcutaneous (SC), and intranasal use, whereas the latter route of administration is less reliable and nasal irritation is a common adverse effect [26]. However, its availability varies across countries significantly. The combination of DHE with antiemetics (where the preparation is available) seems to be effective for the treatment of acute migraine. Intravenous formulation of DHE is very effective and well-tolerated for the treatment of migraine [27]. It is proposed as an acute management of chronic migraine in the primary care to the subgroup of patients who do not respond to NSAID-triptan combinations (1 mg of subcutaneous or intramuscular dihydroergotamine) [26]. Nevertheless, two points must be taken into account: (i) DHE route of administration is mostly parenteral, and self-administration is difficult and takes time for the patient to learn. (ii) It is not clear if the addition of an antiemetic (metoclopramide) in the preparation is responsible for the efficacy of DHE (unknown if there is an additive action) [24]. Doses vary depending on the route of administration, i.e., 1 mg SC, 2 mg intranasal, and 2.5 mg per os.

Ergotamine
Ergotamine is an ergopeptine and the second migraine drug of the ergot family. The most common combination launched in the market is ergotamine tartare + caffeine. Ergotamine has been in clinical practice over 70 years, but there is no common ground for the use of this agent. There are many trials in the literature, which attempts to validate the efficacy of ergotamine. It is recommended for the treatment of acute headache, only in patients with prolonged attacks (>48 hours) or in whom headache recurrence is a substantial issue [28]. This recommendation is in accordance with the European Federation of Neurological Societies' (EFNS) guidelines [20]. EFNS also stated that status migrainosus can be treated by dihydroergotamine (low level of evidence). In many clinical trials [29][30][31][32], ergot derivatives showed lower efficacy than triptans and more adverse events (AE). Therefore, these substances should be dealt with caution [2]. Major AEs are nausea, vomiting, and should be avoided in patients who report these common associated symptoms of migraine, or later than >2 hours after the onset of migraine when the gastric stasis has already occurred. Other AEs are paraesthesia, and ergotism (due to long-term use or ergot derivatives).

Triptans
Triptans are 5-HT1B/1D receptor agonists and very effective for the acute management of migraine. They are specific to treat migraine as they act at the pathophysiology of migraine, inducing vasoconstriction, inhibiting pain pathways, and reducing the input to the trigeminal nucleus caudalis. There are many available triptans, i.e., sumatriptan, naratriptan, zolmitriptan, rizatriptan, almotriptan, eletriptan, and frovatriptan. With the exception of sumatriptan (oral, subcutaneous, and intranasal) and zolmitriptan (oral and intranasal), the other triptans are for oral use only. Generally, triptans are recommended for moderate to severe attacks and there is good evidence (level A) that combining a NSAID with a triptan will prevent from migraine recurrence [2,12,20,21]. The choice of triptan is and should be individualized. Triptans have different pharmacokinetic and pharmacodynamic profile. Subcutaneous sumatriptan (6 mg) is more effective than oral sumatriptan and is preferred when associated symptoms, such as nausea and vomiting, occur. Intranasal spray has fewer side effects than intramuscular sumatriptan (discomfort, nasal irritation, and unpleasant taste). Comparative studies show that eletriptan has the highest efficacy with short-term and sustained effect. The above conclusion is consistent in many studies. Rizatriptan and zolmitriptan are thought to come in second and third place, respectively, in terms of efficacy, although further analysis shows that sumatriptan, rizatriptan, almotriptan, and zolmitriptan are very similar regarding clinical outcome. Naratriptan and frovatriptan have less but longer efficacy than sumatriptan and are relatively safer than other triptans. Naratriptan, frovatriptan, and almotriptan are also preferred for symptomatic treatment in patients that migraine attack recurs after successful treatment (pain free and most bothersome symptom free in 2 hours posttreatment) [2,12,20,21,24,[33][34][35][36]. Triptans can be given in combination with NSAIDs and the effect is considered to be additive. The most common and well-documented combination is that of sumatriptan with naproxen and is the one indicated for migraine attacks that do not respond to oral high efficacy triptans (e.g., eletriptan 40 or 80 mg, or rizatriptan 10 mg) [21]. Another combination that showed effectiveness in acute treatment is frovatriptan with dexketoprofen. Generally, triptans are safe and effective. Due to the vasoconstrictive action, triptan should be avoided to migraineurs with uncontrolled arterial hypertension, cardiovascular and/or cerebrovascular disease, and peripheral vascular disease. Systematical reviews and cohort studies showed that there is not any correlation between the use of triptans and higher cardiovascular risk, however [37,38]. Nonetheless, the use of triptans is not recommended in highrisk patients. Finally, as with ergots, the use of triptans should be limited to 10 days per month to avoid medication overuse headache [2, 19-21].

Ditans
Ditans are a relatively new and different class of specific acute migraine management. The first and only approved by the Food and Drug Administration (FDA) until now is lasmiditan, a selective 5-HT1F receptor agonist, which shows minimal to zero vasoconstrictor activity in contrast to triptans. It is a suitable candidate for migraineurs where triptans are contraindicated or not well tolerated. Lasmiditan is given orally (starting dose of 50 mg and subsequently increase up to 200 mg if there is no benefit). Because lasmiditan penetrates the blood-brain barrier; it presents common AEs from the central nervous system (CNS, dizziness, somnolence, fatigue, and nausea) that restricts its use to those who drive or operate heavy machinery [39][40][41][42].

Gepants
The study of CGRP and its implication to the pathophysiology of migraine has led to discovery of a new class of drugs that are CGRP receptor antagonists. Gepants are suitable for treatment of acute migraine in patients who do not tolerate the triptans or when triptans are contraindicated. The first attempts for the manufacture of DOI: http://dx.doi.org/10.5772/intechopen.93096 these type of drugs led to a dead end, as many of the trials were terminated due to hepatotoxicity. Now, we have two gepants that received FDA approval, ubrogepant (2019) and rimegepant (2020) for the treatment of acute migraine in adult patients. However, more clinical trials and real-world evidence are needed to prove their efficacy and tolerability [43].

Nonsteroidal anti-inflammatory drugs
The most well-studied drugs of this category include acetylsalicylic acid (ASA) (aspirin 900-1000 mg), ibuprofen (200-800 mg), naproxen (275-825 mg), diclofenac (50-100 mg), tolfenamic acid (200 mg), and dexketoprofen (50 mg) [44][45][46][47][48][49][50][51]. The difference in dosage depends on the available formulation for each country and the proposed guidelines of each Headache Society [2,12,20,21,24]. The use of NSAID should be as soon as possible to achieve maximal effect and to preempt the gastric stasis. If the migraineur does experiences nausea or vomiting, parenteral formulations (suppository, intramuscular, and intravenous) of the above drugs should be given with combination of a prokinetic (see below Prokinetics) [12]. For moderate to severe attacks, combinations of NSAID with triptans are recommended. All NSAIDs have more or less (depends on the COX-2 selectivity) the same adverse events including GI bleeds, peptic ulceration, hemorrhagic cerebrovascular accidents, and renal impairment. They should not be given in patients with uncontrolled hypertension or history of peptic ulcer. In case of peptic ulcer, they can be prescribed for a small period of time together with protein pump inhibitors (PPIs).

Acetaminophen
Acetaminophen (paracetamol 1000 mg) is a NSAID with different mechanism of action. It is effective in some patients although it has weaker recommendation than NSAIDs for the management of acute headache [12]. On the other hand, the combination of paracetamol with ASA and caffeine is more effective than single drugs and is recommended for the treatment of mild to moderate severity attacks [20,21,[52][53][54].

Antiemetics/Prokinetics
Many antiemetics (metoclopramide, domperidone, chlorpromazine, prochlorperazine, droperidol, ondansetron, and granisetron) have been studied for the treatment of acute migraine, both as monotherapy as well as adjuvants. The main action as prokinetics is via their dopamine receptor antagonism. Many of them show anti-migrainous action. With the exception of metoclopramide and domperidone, the other antiemetics have a higher risk of QT prolongation and higher rates of acute dystonic reactions, akathisia (extrapyramidal action) and mild sedation, and besides their efficacy (even some of them over triptans) [55][56][57][58][59], they are not recommended for the treatment of migraine. On the other hand, metoclopramide is a mild analgesic when given orally and more efficient when given intravenously. Despite monotherapy with antiemetics is not recommended, adjuvant therapy [45], especially when associative symptoms like nausea or vomiting are present, or latter in the course of migraine (gastric stasis has already occurred), is strongly suggested. The usual dose is for domperidone 10 mg (supportive evidence of efficacy is for 20 mg) up to three times per day or 30 mg (by suppository up to twice per day) and for metoclopramide 10 mg (up to three times per day). Metoclopramide 20 mg is recommended for adults and adolescents, whereas domperidone 10 mg for children due to the possible side effects (dyskinesia, akathisia) [12,20].

Other drugs
Other drugs with low level of evidence that are found to be effective in the acute treatment of migraine attacks are intravenous valproate (dose up to 800 mg) [60][61][62], adjunctive therapy with parenteral dexamethasone (intramuscular or intravenous) for treatment of acute migraine and status migrainosus [20,21,63,64], and a combination of paracetamol with intravenous tramadol [65].

Anti-calcitonin-gene-related peptide/receptor monoclonal antibodies (anti-CGRP/R mAbs)
All four anti-CGRP/R mAbs share several pharmacokinetic advantages over small anti-CGRP/R molecules (e.g., greater target specificity and prolonged halflife, making them suitable for monthly administration to prevent migraine). Three of these macromolecules target the CGRP ligand (fremanezumab, galcanezumab, and eptinezumab), while a fourth (erenumab) targets the CGRP receptor [66][67][68]. They require parenteral administration and have a preferential peripheral site of action, since only 0.1-0.5% of the mAb cross the blood-brain barrier due to their large size (molecular weight around 150 kDa) [66,[69][70][71][72]. All four mAbs have shown particular effectiveness for the prevention of both episodic and chronic migraine [71,72]. Besides the initial skepticism regarding their safety and their potential cardiovascular effect (due to preclinical data that came from studying and blocking CGRP,66) and liver toxicity that emerged after the initial failure of gepants, no safety flags occurred during the large program of their development and all four anti-CGRP/R mAbs have shown similar tolerability and safety in Phase II and III trials. The most common AEs, which were reported during clinical trials, are injection site pain, erythema, respiratory infection, nasopharyngitis, sinusitis, influenza, urinary infection, fatigue, nausea, vomiting, joint pain, back pain, headache, abdominal pain, dysmenorrhea, and dry mouth. Real-world evidence revealed constipation as one of the common adverse effects (not in clinical reporting). Anti-CGRP/R mAbs should be avoided in pregnant and nursing women, as well as in patients with psychiatric, pulmonary, and cardiovascular medical history, until more data are available. Regarding their efficacy, there is not much evidence or head-to-head clinical trials to support the superiority of one drug against the other. Due to their mechanism of action, pharmacokinetics, clinical effect, and cost, Headache societies have formulated practical guides on the proper use of anti-CGRP/R mAbs [5, 12, 21].

Erenumab
Erenumab is the first drug of the anti-CGRP/R category and the only until now that prevents native CGRP ligand binding to the CGRP receptor. It is an IgG2 antibody and the only fully human anti-CGRP/R mAb. At 70 mg, the estimated elimination half-life of erenumab is 21 days, supporting monthly subcutaneous dosing and, thus, betterment in patient compliance [73][74][75]. It is recommended for both DOI: http://dx.doi.org/10.5772/intechopen.93096 episodic and chronic migraine, as well as the treatment of MOH [76]. There are two formulations of erenumab (70 and 140 mg) with almost similar efficacy, and there is a suggestion of starting with the lower dose and increase if there is little efficacy [77]. A review of 3 randomized trials and their extensions suggested that erenumab 140 mg monthly might be preferred over the 70 mg monthly dose in patients with EM or CM and prior preventive treatment failures (>2) [77]. It is administered subcutaneously (SC) once per month, thus achieving better adherence among migraine patients compared to oral daily medications.

Fremanezumab
Fremanezumab is a fully humanized IgG2 mAb that potently and selectively binds to both α and β isoforms of CGRP [78]. It is effective for the prevention of episodic and chronic migraine. It is administered SC and has one formulation of 225 mg, which can be administered either once per month, or three consecutive doses (total of 675 mg) every 3 months. Both dosage options have shown similar efficacy and adverse events [79].

Galcanezumab
Galcanezumab is a humanized IgG4 mAb with a long half-life (~28 days) that binds to both α-and β-CGRP isoforms with approximately equal affinity [80]. Again, several trials have proven its efficacy for the preventive treatment of migraine [81][82][83]. As the other two aforementioned mAbs, galcanezumab is subcutaneously administered. The suggested starting dose is 240 mg (2 consecutive doses of 120 mg formulation) as a starting dose and then 120 mg subcutaneously every month [84].

Eptinezumab
Eptinezumab is the last anti-CGRP/R mAb discovered till now. It is a humanized IgG1 antibody that potently and selectively binds to both α and β forms of human CGRP [85]. The plasma half-life of eptinezumab after an intravenous infusion of 1000 mg is 31 days. There are two clinical trials (PROMISE-1 and PROMISE-2) that support its efficacy in episodic and chronic migraine prevention [86,87]. Eptinezumab is the only intravenously anti-CGRP/R mAb and the recommended dose is 100 mg over 30 minutes every 3 months. It is not yet approved by the FDA or EMA (under development).

No disease-specific
Several drug classes, originally developed for other diseases (e.g., epilepsy, hypertension), have shown efficacy for the preventive treatment of migraine. Repurposed drugs may lack the disease-specific mechanism of action and have several adverse effects and contraindication, but show comparable efficacy to CGRP mAbs and are less expensive. As with the use of disease-specific treatments, when using nonspecific drugs, our main goal is individualizing our choice, taking into account the clinical characteristics, medical history, and comorbidities of the patient (e.g., sex, weight, anxiety/depression, hypertension, endocrinological disorders, pregnancy, etc.). The main categories are anticonvulsants, antihypertensive and antidepressant drugs, and other agents (e.g., onabotulinumtoxinA, butterbur, coenzyme Q10, NSAIDs, and others).

Topiramate
Topiramate is one of the most studied drugs for the prevention of migraine, with several clinical studies, systematical reviews, and meta-analysis, showing its efficacy for both episodic and (fewer evidence) chronic migraine [26,[88][89][90][91][92][93]. Usual dosage ranges between 25 and 100 mg daily (in two divided doses) and there is suggestion, with the risk of more adverse events, of increasing the total dose up to 200 mg daily when the effect is suboptimal [2,12,20,21,26]. Main AEs of topiramate are paresthesia/numbness (results in intolerance), fatigue, anorexia/ weight loss, memory and concentration difficulties, and renal calculi (uncommon but serious adverse effect). It is contraindicated in pregnant women as it increases the risk of facial clefts and lowers birth weight. Due to the weight loss, topiramate is recommended to obese migraine patients [89,90,94].

Valproate
Whereas valproate is indicated for the preventive treatment of episodic migraine, its side effects (nausea, somnolence, dizziness, weight gain, and hair loss) and the contraindication to women in childbearing age and pregnancy (teratogenic) have limited its use. Usual doses range between 500 and 1800 mg per day and there is limited evidence of intravenous administration of valproate in status migrainosus [2, 12, 20, 21, 95].

Other anticonvulsants
Other anticonvulsants, such as gabapentin, have not proven their efficacy for prevention of episodic migraine and therefore are not recommended [96,97] .

Antihypertensive
The two major categories of antihypertensive drugs that show migraine preventive effect are beta-blockers and calcium channel blockers. Most of the evidence emerged from studies regarding hypertension reported fewer headaches in the intervention group vs. the placebo group [98].

Beta-blockers
Beta-blockers that are available in almost every country and are recommended from almost all Headache Societies for the preventive treatment of episodic migraine are metoprolol (50-200 mg daily) and propranolol (40-240 mg daily). Other beta-blockers with fewer studies are atenolol (25-100 mg daily), nadolol (20-240 mg daily), timolol (10-30 mg daily), and bisoprolol (5-10 mg daily). Betablockers are recommended in hypertensive patients who are under 60 years old or nonsmokers [94,99,100]. Due to their mechanism of action and their dosage that is proven to be efficacious for migraine prevention, are not well tolerated and are contraindicated in patients with bradycardia, low blood pressure, cardiac conduction blocks, asthma, depression, and Raynaud phenomenon [2, 12, 20, 21, 101].

Calcium channel blockers
The only drug of this category with good level of evidence is flunarizine, a nonspecific calcium channel blocker, with calmodulin binding properties and histamine DOI: http://dx.doi.org/10.5772/intechopen.93096 H1 blocking activity. Recommended dose ranges between 5 and 10 mg daily and is prescribed to hypertensive patients older than 60 or smokers, as well as to patients with Raynaud syndrome. The most common AEs are weight gain, daytime sedation, stomach complaints, and dry mouth, and while there are reports of depression and extrapyramidal symptoms, there is no confirmation [102]. Verapamil is another calcium channel blocker with migraine preventive properties, but it has conflicting supporting data and many Headache Societies do not accept its use for episodic migraine [2, 12, 20, 21, 103].

Angiotensin receptor blockers (ARBs)/angiotensin converting enzyme (ACE) inhibitors
There is also data supporting the use of ACE inhibitors and ARBs as preventive migraine treatments. Candesartan, a specific ARB, has shown positive results in smallscale crossover studies and is used for migraine prophylaxis (16-32 mg) [104,105]. The most common AEs include back pain, dizziness, flu-like symptoms, sore throat, and nasal congestion. Similarly, a small-scale double-blind cross-over study, found lisinopril (ACE inhibitor) to be effective in episodic migraine [106]. The above data are not universally approved [2, 12, 20, 21].

Antidepressants
Antidepressants are recommended as a second-line drugs with level B documentation [20]. The two drugs of this category are amitriptyline and venlafaxine. Among the two amitriptyline, a tricyclic antidepressant has been studied the most [103]. The usual dose ranges between 10 and 150 mg. Its sedative properties have limited its use and it is suggested only at bedtime and especially to those who suffer from insomnia. It also has a place as a second choice drug for chronic migraine [26]. Except sedation, amitriptyline's AEs include dry mouth, urinary retention, constipation, weight gain, blurred vision, and tachycardia. Venlafaxine, a serotonin-norepinephrine reuptake inhibitor, has a weaker recommendation as migraine prophylaxis and is preferred to those who suffer from depression and/or anxiety and those who have also tension-type headaches (TTH). The usual dose ranges between 37.5 and 150 mg daily [2, 12, 20, 21, 94].

OnabotulinumtoxinA
Whereas many randomized trials did not prove onabotulinumtoxinA's efficacy for treating episodic migraine (EM) and it is not recommended [107][108][109], data extracted from chronic migraine (CM) trials recommend onabotulinumtoxinA as an effective and well-tolerated treatment. OnabotulinumtoxinA has a good level of documentation (Level A), and there is specific protocol regarding its use (PREEMPT protocol), monitoring of the patients, and evaluating their response. It should be administered according to the PREEMPT injection protocol, i.e., injecting 155 U-195 U to 31-39 sites every 12 weeks. The most common reported AEs are neck pain, muscular weakness, eyelid ptosis, and injection-site pain, and the sub-analysis of the PREEMPT studies found that adverse events decreased over time [26,[110][111][112]. Its use in CM with MOH is debatable after a recent trial that showed no superiority against acute withdrawal alone [113].

Non-pharmaceutical therapies
Like the pharmaceutical, the non-pharmaceutical treatments-neuromodulation devices in particular-gain even more ground in the treatment of migraine.
A set of variables arrange this alternative so far, therapeutic approach. First, the pathophysiology of migraine refers to a multidisciplinary spectrum of mechanisms; second, the disease is among the most disabling medical conditions requiring application of all available treatment options; third, the existing medicinal selections (symptomatic or preventative) are related with poor adherence due to safety and poor response rates ; and finally, there is an international movement encouraging non-pharmaceutical interventions in medicine, including the community mitigation strategies. Patients' preferences rate the non-pharmaceutical interventions for migraine highly [3]. All these factors create large space for non-pharmaceutical treatment options in migraine, which can be used alone or as adjunct therapy to pharmacological agents minimizing unnecessary drug exposure. There is good evidence for neuromodulation and biobehavioral therapies, including cognitive behavioral therapy (CBT), biofeedback, and relaxation training. Less evidence suggests physical therapy, sleep management, acupuncture, and dietary modifications.

Neuromodulation
Neuromodulation approaches for migraine treatment includes invasive and noninvasive ones. Both procedures act by stimulating the nervous system centrally or peripherally, leading to pain relief, either acutely or preventively. They are constantly gaining space in the treatment of migraine and are addressed either to refractory patients or to patients who do not want medical treatment. All neuromodulation devices are summarized in Table 3.

Invasive
There are three invasive neurostimulation methods investigated for migraine and available, yet in very limited use because of the high cost of the device, the surgical implementation needed, and the lack of good evidence of efficacy. In addition, their accessibility and reimbursement vary by country significantly. Thus, they are recommended for patients with refractory forms of CM only. The most common AEs include migration of the leads, infection, and paraesthesias [7].

Invasive occipital nerve stimulation (iONS)
Invasive occipital nerve stimulation (iONS) has been used to treat refractory CM cases. The exact mechanism of the neuromodulation effect in CNS remains unclear. From three randomized, sham-controlled studies [114][115][116], only one showed a significant improvement of migraines in the treated group comparing to sham group or the medication treated group [115]. Electrodes must be implanted subcutaneously above the great occipital nerve (GON), which present great anatomical variability among individuals [117]. The leads are implanted bilaterally, while a small generator is implanted subaxillary. The AEs include lead migration, paraesthesias, infections, and battery depletion, but safety data look better than the other invasive procedures [116].

Vagal nerve stimulation (VNS)
Vagal nerve stimulation (VNS) is already applied in patients with refractory epilepsy. The stimulation of vagal afferents decreases the activity of the nociceptive neurons of the spinothalamic and spinoreticular tract, which, in their turn, inhibit the nociceptive transmission in spinal and trigeminal nucleus complex, leading to 15 Therapeutic Management: When and What DOI: http://dx.doi.org/10.5772/intechopen.93096 cephalic pain control. There is data from case series with refractory CM only showing that patients with implanted VNS (iVNS) reached more than 50% reduction in headache frequency and severity [118,119]. The scarce clinical experience in this field make iVNS not a common treatment option, for the time being, since it is an invasive procedure with adverse effects (infection, muscle cramps, local pain, and battery depletion), though the clinical experience in the field of epilepsy shows to be safe.

High cervical spinal cord stimulation
This invasive procedure trialed in open label studies in patients suffering from CM and showed a significant reduction in headache frequency and intensity in treated patients, but further investigation is required [120,121].

Noninvasive
Noninvasive neuromodulation devices provide a safe and well-tolerated therapeutical option in symptomatic and prophylactic treatment of migraine alone or in combination with pharmaceutical treatment. Their evidence of efficacy is moderate to good and almost equivalent to that of drug treatments, while their safety profile may outperform them. There are accessibility, reimbursement, and price issues, however.

Supraorbital nerve stimulation
This is a peripheral noninvasive nerve stimulation or an external trigeminal nerve stimulation device which initiates transcutaneously a mild electric current via leads that are placed on the forehead, stimulating supraorbital and supratrochlear nerves. There is evidence of dysregulated central and peripheral pathways in migraine and evidence that external trigeminal nerve stimulation may normalize function of these pathways [122]. Sham-controlled studies showed that 1-hour stimulation with this device reliefs headache pain during a migraine attack significantly [123], while daily 20-minute treatment decreases the monthly migraine days in patients suffering from EM [124]. The device is FDA approved and CE marked as preventive and acute therapy in migraine. Only mild AES are reported and despite some concerns related to the methodology followed in the preventive trial, its efficacy seems comparable to pharmaceutical preventive treatments [122,125].

Transcranial magnetic stimulation (TMS)
TMS is a well-established and safe procedure already applied in other neurological diseases, modulating the excitability of cortical neurons dependently on the frequency of the stimulus. Thus, only the single-pulse stimulation (sTMS) and the repetitive-pulse stimulation (rTMS) are used to treat migraine.
sTMS is proved to inhibit both mechanical and chemically-induced cortical spreading depression in animals [126]. In addition, sTMS attenuates the evoked firing rate of third-order thalamocortical projection neurons, indicating the probable neuromodulatory effect in migraine [126]. Overall, sTMS interrupts the brain hyperactivity associated with migraine. sTMS devices are portable and patient-controlled and are applied over the occipital cortex in patients with either migraine with aura (MwA) or migraine without aura (MwoA) for acute or preventive treatment. One sham-controlled study showed that sTMS caused higher rates in 2-hour pain relief posttreatment than the sham group in patients with MwA [127]. Open-label studies have shown an efficacy either in acute or preventive treatment in MwA or MwoA [128][129][130][131]. The most common AEs recorded in the trials were lightheadedness (3.7%), tingling (3.2%), and tinnitus (3.2%) [131]. The device is FDA approved for acute and preventive treatment of migraine for people aged more than 12 years. rTMS and especially high frequency rTMS seem to have a positive effect in the prevention of both EM and CM. Treatment with rTMS caused a significant decrease of monthly headache days over sham-treated patients, for both cases of CM [132] and EM [133], but another sham-controlled study did not confirm the results in CM, probably because of a large effect size [134]. Overall, the majority of rTMS studies reported reductions in headache frequency, duration, intensity, abortive medication use, depression, and functional impairment, with no significant adverse events [135]. Further investigation is needed, however.

Noninvasive vagus nerve stimulation (nVNS)
As in iNVS, the nVNS results in an ascending antinociceptive on trigeminal nucleus complex. In addition, nVNS inhibits cortical spreading depression in rats [136]. In migraineurs, the device is applied on the neck, and it produces an electrical stimulus of adjustable intensity, and therefore, stimulates transcutaneously the cervical part of vagus nerve. The evidence of efficacy in symptomatic treatment of migraine is good [8]. One sham-controlled, class 1 study has showed its efficacy in acute treatment of migraine [137], whereas its efficacy in migraine prevention remains debatable [138][139][140]. It is used in acute treatment of migraine with consisted results similar to the use of NSAIDs or triptans [141]. In a small-size open-label study, nVNS showed promising results as mini-prophylactic treatment of the menstrual migraine [142]. Reported AEs are neck twitching, change in voice, and redness at the site of stimulation. It is generally well tolerated by the patients, however. The portable nVNS device has received FDA approval and is CE marketed for the symptomatic treatment of migraine.

Remote electrical neuromodulation (REN)
Not only cranial nerves but also peripheral somatic nerve stimulation may also modulate cephalic pain processing, via descending endogenous analgesic mechanisms (conditioned pain modulation). There is evidence that the stimulation of upper arm peripheral nerves (median and musculocutaneous) controls cephalic pain [143]. A noninvasive, portable, and wireless device, applied on the lateral upper arm between the bellies of deltoid and triceps muscles, delivers electrical stimuli that alleviate migraine pain [144]. The device has been tested for acute migraine treatment in one randomized, sham-controlled study showing superiority over sham stimulation in achieving pain relief and freedom and relief of most bothering symptoms without significant AEs [145]. Notably, the treatment efficacy is comparable with this of the current use pharmaceutical ones [146]. Its use is contraindicated to patients with other active implantable medical devices and it is FDA approved for the symptomatic treatment of migraine.

Transcranial direct current stimulation (tDCS)
There is some evidence suggesting that tDCS modulates cortical hyperexcitability and therefore it serves as a preventive treatment for CM and EM. The small-size, sham-controlled studies based on both rationales of anodal stimulation (excitatory) and cathodal (inhibitory) on visual cortex mostly have shown positive effect-with limitations-on reduction in monthly migraine days, headache frequency, pain duration, and severity. Contradictions include previous stroke or epilepsy and comorbidity with psychiatric disorders, among others. This procedure is under investigation currently [147][148][149][150].

Percutaneous mastoid stimulation
There is evidence suggesting that the stimulation of fastigial nucleus displays neuroprotective, in particular the stimulation of fastigial nucleus elicits longlasting suppression of periinfarction depolarizing waves and protect rats against cerebral ischemia [151]. Because cortical spreading depression shares characteristics with periinfarction depolarizing waves, it was speculated that this stimulation of this nucleus may be useful in migraine prevention [152]. The new device for this purpose has electrodes that are placed on the bilateral ear mastoid over the skin.
After few open label studies, one sham-controlled showed a significant reduction in migraine days and response rate vs. sham group in patients suffering from EM, without AEs [152]. The device is under development and further studies are needed.

Nutrient (nutraceuticals)
Nutraceuticals have been defined as, "a food (or part of a food) that provide medical or health benefits, including the prevention and/or treatment of a disease" [153]. There is an increasingly and demanding use of them by sufferers of chronic diseases including migraine [154], for which there is evidence supporting cerebral energy deficiency [155]. Nutraceuticals may cover this metabolic gap in brain, but the equality of data is low to moderate, however.

Riboflavin
Riboflavin (vitamin B2) is an essential component and precursor of riboflavin 5-phosphate, and modulates the electron transport chain, contributing in energy production in mitochondria. There is evidence indicating that oxygen metabolism is impaired in migraineurs' mitochondria resulting in energy insufficiency [155]. Results from placebo-controlled studies showed efficacy in reducing the frequency of headache days in adult migraineurs [156], but not children [157], or when administered as component in compliment [158]. According to available evidence, riboflavin could be suggested as preventive treatment in adults with EM in a daily dose of 400 mg [20,159,160].

Coenzyme Q10
Coenzyme Q10 has a similar action with riboflavin. In placebo-controlled studies, CoQ10 reduced the monthly headache days in adults with EM [161] but its efficacy in children and adolescents remains unclear [115]. There is Level C recommendation for its use as prophylactic treatment in EM [20,160], and strong recommendation from the Canadian Headache Society (CHS) [159] in a dosage of 100 mg TID.

Magnesium
Magnesium deficiency may increase migraine susceptibility. Oral magnesium has been studied in migraine prophylaxis largely [162], as the intravenous MgSO 4 for the symptomatic treatment of migraine [163]. Oral magnesium is suggested for migraine prophylaxis with level B or C of evidence [20,160], in a daily dose of 600 mg. A later meta-analysis downgraded the level of evidence, however [162]. Adverse events with magnesium are soft stool, diarrhea, and flushing. For the symptomatic treatment of migraine, intravenous MgSO 4 has failed to show beneficial effect in terms of reduction of pain and rescue medications, while several adverse effects reported questioning the clinical relevance of this symptomatic treatment [163].

Petasites hybridus or Butterbur
Petasites is a herbal extract, with moderate to good evidence of efficacy in migraine prevention [164,165]. However, there are safety issues related with liver toxicity [166]. Yet, it is recommended as a second-choice treatment for the prevention of migraine [20,167]. Feverfew is a medicinal plant that has been investigated for the migraine prophylaxis with controversial results. A recent review presents some positive findings in comparison to previous ones [168,169]. Not major AEs are reported (usually mouth ulcers and gastrointestinal complaints). CHS does not recommend the use of Feverfew for migraine prevention; AAN/AHS recommends it as probably effective (level B) and EFNS as possibly effective (level C).

Ginkgolide-B
Ginkgolide-B is an extract from Ginkgo biloba tree that has shown efficacy in the prevention of migraine in a small-size, open label study [170], without any other confirmation.

Omega-3 polyunsaturated fatty acids (OPFAs)
The exact mechanism of OPFAs in migraine is unknown. One placebo-controlled study showed no significant difference between active and placebo group in reduction of migraine days [171].

Dietary interventions
Different types of dietary interventions have been suggested and studied in migraine prevention such as weight loss diet, low fat diets, ketogenic diets, and elimination diets, being the most popular and well-studied ones, and there are reports for several others. Because of the high comorbidity of headache with obesity, weight loss diet is a promising approach linked through inflammatory mediators that are released from adipose tissue. Nevertheless, it does not come out that weight loss or change in dietary intake may attenuate migraine frequency [172].

Acupuncture
Unrelated to placebo effect, a proportion of patients respond to acupuncture treatment in practice. From recently reviews, acupuncture shows at least not inferior efficacy in the prevention of migraine comparing to conventional prophylactic treatment at a 3-month follow-up vs. placebo, although there is lot of discussion about the high proportion of placebo effect in this procedure (no significant difference between verum acupuncture vs. sham acupuncture groups) [173,174]. Only minor gastrointestinal AEs are reported. Despite the debatable mechanism of action and the methodological shortcomings of the relative research, the evidence suggests its use in migraine prevention, representing a therapeutic option for those patients who do not prefer medicinal treatments or display nocebo behaviors, which are very prevalent among migraineurs [11]. High recurrence rates after 6-month follow-up have been reported, however [174].

Physical therapy
The use of physical activity in alleviating the burden of migraine is unclear and data are missing. A cross-sectional study showed that physically active respondents had lower odds of migraine than moderately active respondents [175]. Physical treatment may have an effect, however, several musculoskeletal dysfunctions, in particular neck pain and vestibular symptoms have been reported to coexist with migraine [176,177]. Thus, physical interventions may improve clinical outcomes when combined with pharmacotherapy. These include manual treatment of trigger points and stretching of the sternocleidomastoid and upper trapezius muscles, among other techniques (e.g., relaxation and aerobic exercise). Although physical therapy is recommended [178], the evidence of efficacy is very limited, and the documentation is rather empirical. A meta-analysis of controlled trials found that physical therapy techniques reduced the duration of migraine attacks but had no effect on pain intensity and attack frequency [179]. Thus, further investigation is needed.

Cognitive behavioral therapies
Though it is generally believed that biofeedback, relaxation training, and CBT improve migraine treatment outcomes either alone, or more often, in combination with medications, the evidence is poor. In one randomized trial among young patients (10-17 years old) suffering from chronic migraine, the use of CBT (10 sessions) plus amitriptyline resulted in greater reductions in days with headache and migraine-related disability compared with the use of headache education plus amitriptyline [180]. A recent meta-analysis found that 54% of individuals with migraine reported at least 50% reduction in migraine frequency after psychological therapy, vs. 24% of controls [181]. Because CBT differs substantially from traditional psychotherapy, it focuses on here and now and it is typically time limited; this therapeutic option may help practitioners in migraine management, in pediatric populations in particular [182].

Patient centricity and patient education
Migraine is a heterogeneous disease with a spectrum of clinical manifestations varying between individuals. The choice of therapy requires an individual approach, as each patient is unique. Severity and frequency of attacks, disability causing, other symptoms, time to peak, patient preferences, comorbidities, drug interactions, side effects, and prior therapies that failed should be all taken into consideration [2]. Before proposing any therapeutic approach, local availability and accessibility to medications should also be considered. Patient preferences and needs of each individual are essential to achieve treatment adherence and patientreported satisfaction. Fast-acting drugs are generally preferred from patients with migraine during acute attacks [183]. Effectiveness of drugs seems to be the most important issue regarding prophylactic treatment, followed by time to effect and adverse events [184]. Although patient centricity has been established in the last years, it is not yet a standard practice to include patients at all appropriate levels of decision-making processes that are related to their health and well-being. Patient education is also of great significance to ensure treatment adherence. This could be achieved by thoroughly explaining patients' disorder, purpose, and means of management. Ineffective clinician-patient communication is a major reason for patient treatment nonadherence. Patients thus should be counseled in advance on the potential benefits of the proposed therapy as well as on the treatment-related adverse effects that may appear. In conclusion, clinicians should always individualize their treatment strategy to the specific needs of each migraine sufferer, with multidisciplinary approaches, usually both pharmaceutical and non-pharmaceutical. Patients should be encouraged to take an active role in their own therapy [21]. Due to the heterogeneity of migraine, developers of guidelines should engage