Evidence-Based Clinical Protocol for Migraine Treatment
Medication Treatment
Acute attack therapy. The goal of treating an acute migraine attack is to relieve pain and accompanying symptoms as quickly as possible and restore the ability to function. The choice of medication depends on the intensity of the attack and the individual characteristics of the patient. For mild to moderate attacks, non-opioid analgesics are recommended, especially nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen, acetylsalicylic acid (aspirin), naproxen and diclofenac, or combination analgesics with caffeine. For moderate to severe attacks, and when simple analgesics are not effective enough, migraine-specific medicines are prescribed, primarily triptans. Triptans (sumatriptan, zolmitriptan, rizatriptan, eletriptan and others) are agonists of the serotonin 5-HT_1B/1D receptors and are highly effective for stopping migraine: about 70–80% of patients get relief within 2 hours. They are recommended to be taken as early as possible after the pain begins. If triptan monotherapy has an insufficient effect, it is reasonable to increase the dose to the maximum or to try a different triptan for the next attack. It has been shown that a combination of sumatriptan (50–100 mg orally) with naproxen (550 mg) gives a better result in patients with a partial response to a triptan than either drug alone. Dihydroergotamine (DHE), an ergotamine derivative, can be used as an alternative vasoconstrictor (intranasally or by injection) for severe attacks, although it is tolerated less well than triptans. To relieve nausea and vomiting during migraine, antiemetics are additionally prescribed: metoclopramide or prochlorperazine (especially intravenously in a hospital setting). In the emergency department, these medicines (intravenous metoclopramide, prochlorperazine) are recommended as first-line options, and intravenous dexamethasone may be added to help prevent recurrence of the headache. Opioids should be avoided in migraine because they are not specifically effective and increase the risk of misuse (morphine, hydromorphone and other opioids are recommended not to be used). For patients with pronounced nausea or vomiting, it is useful to use non-oral forms of medication: suppositories, nasal sprays (for example, intranasal sumatriptan or zolmitriptan) or subcutaneous sumatriptan injections, which ensure absorption even when oral intake is impaired.
Choosing acute attack therapy according to severity: for mild to moderate attacks, NSAIDs, non-opioid analgesics (paracetamol) or combination products with caffeine are effective; for moderate or severe attacks (and for milder ones that do not respond to treatment), migraine-specific medicines such as triptans or dihydroergotamine should be used right away; newer options (gepants, ditans) are reserved for cases of treatment failure or contraindications to triptans.
The strategy can be "stratified" (the level of therapy is chosen immediately according to the severity of the attack) or "stepwise" (step care: starting with a simpler medicine and moving to a stronger one if it fails). Current guidelines favor the stratified approach because it leads to faster relief and higher patient satisfaction than gradual stepwise escalation. However, where resources are limited or in mild cases, a stepwise approach may also be used: for example, the European Headache Federation (EHF) recommends trying NSAIDs for the first three migraine attacks and moving on to triptans only if they are ineffective; if three different triptans have no effect, a switch to another class of medicines (gepants or ditans) should be considered. Gepants are oral CGRP receptor antagonists (ubrogepant, rimegepant and others) that have appeared recently; ditans are 5-HT_1F receptor agonists (lasmiditan), also a new class. They can be used to stop an attack in patients for whom triptans are contraindicated (because of cardiovascular disease) or ineffective. According to the consensus, gepants and ditans should be prescribed only after at least two different triptans have been tried, because there are no direct data showing their superiority over triptans, and they are also expensive. In some cases, when an attack lasts more than 72 hours (status migrainosus) or does not respond to standard therapy, hospitalization and intravenous infusions are used: DHE, metoclopramide, or valproate, magnesium sulfate and glucocorticoids. It is also important to warn the patient about medication overuse: taking symptomatic medicines too often can itself lead to chronic pain (medication-overuse headache). The general recommendation is to limit the use of acute (rescue) medication to no more than 2 days a week (no more than 8 days a month for triptans or combination analgesics; no more than 10–15 days for NSAIDs). If a patient needs to treat attacks more often, preventive treatment should be considered.
Preventive (interictal) therapy. Preventive treatment of migraine aims to reduce the frequency and intensity of attacks and improve quality of life. The decision to start it is made for frequent or severe migraines: the general recommendation is to offer prevention if migraine occurs on 4 or more days a month, or less often if the attacks are very severe or cause significant disability. Other indications are ineffectiveness, contraindications or poor tolerability of acute medications. Preventive medicines are taken daily (regardless of whether there is pain) as a long course. Effectiveness can be assessed after 2–3 months, and the optimal course is at least 6 months. Treatment starts with low doses and the dose is increased slowly until effective, in order to minimize side effects.
The main groups of medicines for migraine prevention with a high level of evidence (level A according to clinical guidelines) include beta-blockers, certain anticonvulsants, and anti-CGRP antibodies. First-line beta-blockers: propranolol (80–240 mg/day), metoprolol (50–200 mg), timolol or atenolol, which reduce the frequency of attacks through their effect on the adrenergic system. They are among the longest-used preventive medicines, and their effectiveness has been confirmed in controlled studies (a reduction in migraine frequency of about 50% in a significant proportion of patients). Anticonvulsants: topiramate (50–100 mg/day) and valproic acid/sodium valproate (500–1500 mg/day) also have proven effectiveness (level A). Topiramate is recommended as one of the drugs of choice for preventing episodic migraine, but the dose should be adjusted slowly because of possible side effects (paresthesia, cognitive complaints and others). Valproate is effective, but its use is limited because of teratogenicity and it is undesirable in women of reproductive age (it should not be prescribed to women who could become pregnant without reliable contraception). Antidepressants: amitriptyline (a tricyclic antidepressant) is used most often, at doses of 10–75 mg at night; it can reduce migraine frequency, especially in patients with coexisting chronic tension-type headache or sleep disorders. Amitriptyline has evidence level B (good effectiveness, although there are fewer data). Venlafaxine (75–150 mg/day, an SNRI antidepressant) is an alternative, also level B. Current guidelines advise against prescribing flunarizine (a calcium channel blocker available in some countries) or cinnarizine without strict supervision because, although they may be effective, their side effects (sedation, weight gain, extrapyramidal symptoms) limit their use. Angiotensin II receptor blockers: candesartan (16–32 mg/day) has proven effectiveness comparable to propranolol and is considered a first-line option (level A), especially when beta-blockers are contraindicated. Calcium channel blockers (for example, verapamil) are also used in some patients, but the evidence base for them in migraine is weaker, except in special situations (verapamil is used more often in cluster headache).
Monoclonal antibodies against CGRP (or its receptor) are the newest class of preventive medicines, developed specifically for migraine. They include erenumab (an antibody to the CGRP receptor) and galcanezumab, fremanezumab and eptinezumab (antibodies to the CGRP ligand). These medicines are given subcutaneously or intravenously once every 1–3 months and have shown high effectiveness in reducing the number of migraine days in both episodic and chronic forms, with minimal side effects. For example, in studies the antibodies reduced the frequency of migraine days by about 50% in half of the patients who had not responded to earlier oral preventive medicines. Given the cost, most international protocols recommend using CGRP antagonists in patients who have not succeeded with at least two conventional preventive medicines. However, some experts believe that, in the absence of contraindications, they can also be considered as a first-line option in patients with frequent and severe migraines, given their high effectiveness and better tolerability compared with older medicines. Anti-CGRP antibodies should not be prescribed to pregnant or breastfeeding women, or to patients with uncontrolled cardiovascular disease or severe mental disorders (because of the lack of experience in these groups). Botulinum toxin type A (onabotulinumtoxinA), injected according to a set pattern into the muscles of the head and neck, is an evidence-based method of preventing chronic migraine (migraine on 15 or more days a month). The medicine is given at 155–195 units every 12 weeks and has been shown to reduce headache frequency in the chronic form. It is officially approved for chronic migraine and is included in protocols as a treatment option of choice for such patients. According to studies, botulinum toxin is not effective for episodic migraine.
In general, the choice of preventive medicine is individualized according to coexisting conditions: for example, beta-blockers are preferred in hypertension or tachycardia; venlafaxine or amitriptyline in coexisting depression; topiramate in obesity or epilepsy; and botulinum toxin or CGRP antibodies in chronic migraine. Sometimes success is achieved by combining two preventive medicines at lower doses, although data on combination therapy are still limited. It is important to adjust the dose gradually and to keep a headache diary. If migraine is well controlled, after 6–12 months it may be possible to try gradually withdrawing the preventive medicine. The patient should be warned that the effect of prevention does not appear immediately, and should be reminded of the importance of avoiding excessive use of acute medications, which can undo the success of prevention.
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