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A review of frovatriptan for the treatment of menstrual migraine

Authors MacGregor EA

Received 4 March 2014

Accepted for publication 2 April 2014

Published 21 May 2014 Volume 2014:6 Pages 523—535

DOI https://doi.org/10.2147/IJWH.S63444

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

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E Anne MacGregor

Barts Sexual Health Centre, St Bartholomew's Hospital, Centre for Neuroscience and Trauma, Blizard Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, London, UK

Abstract: The objective of this review is to provide an overview of menstrual migraine (MM) and of frovatriptan and to assess clinical trial data regarding the efficacy and safety of frovatriptan for the acute and short-term prophylaxis of MM. Randomized controlled trials comparing frovatriptan with placebo or a triptan comparator for the acute or prophylactic treatment of MM were selected for review. MM affects up to 60% of women with migraine. Compared with attacks at other times of the cycle, menstrual attacks are longer, more severe, less responsive to treatment, more likely to relapse, and more disabling than attacks at other times of the cycle. No drugs are licensed for acute treatment of MM; triptans are recommended for treatment of moderate to severe attacks for menstrual and nonmenstrual attacks. Perimenstrual prophylaxis is indicated for patients with predictable MM that does not respond to symptomatic treatment alone. Treatment is unlicensed, but options include triptans, nonsteroidal anti-inflammatory drugs, and hormone manipulation. Frovatriptan is distinctive from other triptans due to its long elimination half-life of 26 hours, which confers a longer duration of action. Post hoc analyses from randomized trials of MM show similar pain relief and pain-free rates for frovatriptan compared with other triptans (2 hours pain-free: relative risk [RR] 1.27, 95% confidence interval [CI] 0.91–1.76) but significantly lower relapse rates (24 hours sustained pain-free: RR 0.34, 95% CI 0.18–0.62). Data from randomized controlled trials show a significant reduction in risk of MM in women using frovatriptan 2.5 mg once daily (RR 1.56, 95% CI 1.31–1.86) or twice daily (RR 1.98, 95% CI 1.68–2.34) for perimenstrual prophylaxis compared with placebo. The twice daily dosing was more effective than once daily (RR 1.27, 95% CI 1.11–1.46). These findings support the use of frovatriptan as a first-line acute treatment for MM and for perimenstrual prophylaxis.

Keywords: menstrually related migraine, acute treatment, prophylaxis


Introduction

Frovatriptan is recommended by a number of national guidelines, for the perimenstrual prophylaxis of menstrual attacks in women with pure menstrual migraine (MM) or menstrually related migraine.17 Although frovatriptan is not licensed for perimenstrual prophylaxis, data from placebo-controlled, randomized controlled trials (RCTs) support its use for this indication. This review provides an overview of MM and of frovatriptan and evaluates the published clinical trial data for frovatriptan use in both the acute treatment and perimenstrual prophylaxis of MM (pure menstrual and menstrually related).

Background

Migraine

Migraine is a primary headache disorder affecting four of every ten women and two of every ten men, mostly before age 35 years.8 By the age of 30 years, migraine is threefold higher in women than in men.9 The effects of migraine on the individual vary considerably from minimal disruption of daily activities to severe disability; in the Global Burden of Disease Survey 2010, migraine was noted to be the third most prevalent disorder and was ranked as the eighth leading cause of years lived with disability worldwide.10

The most common types of migraine are migraine without aura, followed by migraine with aura.11 Attacks typically last 4 to 72 hours, with two or more specific features (unilateral location, pulsating, moderate to severe pain intensity, or aggravation by routine physical activity) during the attack. Migraine attacks are also accompanied by at least one of nausea and/or vomiting, photophobia, and phonophobia.11

Focal neurologic symptoms of migraine aura affect around 30% of patients, who may also experience attacks without aura.12 Typical aura involves any combination of visual, hemisensory, or language abnormalities, with each symptom developing over a minimum of 5 minutes and lasting a maximum of 60 minutes.11 The majority of auras are visual, consisting of a flashing light or an enlarging blind spot rimmed with a shimmering edge or jagged lines in the peripheral vision. Nonvisual auras include spreading unilateral numbness or tingling affecting the face and upper extremities and disturbed thinking or speech. Migraine headache, if present, usually occurs within 1 hour.

Although the timing of attacks is mostly unpredictable, a number of specific factors are recognized as migraine triggers. A retrospective analysis identified stress (80%), hormones in women (65%), not eating (57%), weather (53.2%), and sleep disturbance (50%) as the most commonly reported triggers.13

Menstrual migraine

Menstruation is a significant risk factor for migraine without aura, even in women who have migraine, with or without aura, at other times of the cycle.1418 In population- and clinic-based studies, between 20% and 60% of women with migraine report an association with menstruation.17,1923 Attacks are most likely to occur on or between day −2 and day +3 of bleeding (where day 1 is the start of bleeding).1517,2427 Although some women report a link between migraine attacks and ovulation, this has not been confirmed in epidemiologic studies.17,25,26,28

The International Headache Society recognizes two types of MM: pure MM and menstrually related migraine (Table 1).11 The term “MM” is often used to encompass both conditions. For a diagnosis of pure MM, attacks of migraine without aura occur only on or between days −2 to +3 of the cycle, ie, with no attacks at any other time of the cycle, in at least two of three menstrual cycles; for a diagnosis of menstrually related migraine, migraine attacks also occur at other times of the cycle. Diary cards are a prerequisite as relying on the history to confirm the diagnosis can be misleading.20,29 The majority of women with menstrual attacks experience menstrually related migraine; fewer than 10% have pure MM.17,22,23,30

Table 1 International Headache Society classification of menstrual migraine
Notes: For the purposes of ICHD-3 beta, menstruation is considered to be endometrial bleeding resulting from either the normal menstrual cycle or from the withdrawal of exogenous progestogens, as in the use of combined oral contraceptives or cyclical hormone replacement therapy. The first day of menstruation is day 1, and the preceding day is day −1; there is no day 0.
Abbreviation: ICHD, International Headache Society Classification of Headache Disorders.

The perimenstrual increased risk of migraine has been associated with estrogen “withdrawal”, which occurs during the late luteal phase of the natural menstrual cycle and also during the hormone-free interval of combined hormonal contraceptives.26,3135 Estrogen is a neurosteroid, influencing the pain processing networks and vascular endothelium involved in the pathophysiology of migraine. Serotonin-producing neurons are sensitive to the presence or absence of estrogen.36 As serotonin is implicated in migraine pathophysiology, this association with estrogen may account for increased perimenstrual risk of migraine and also for the efficacy of triptans for perimenstrual prophylaxis.

Management of menstrual migraine

No drugs are specifically licensed for the acute or prophylactic treatment of MM.

Acute treatment

Drugs licensed for the acute treatment of migraine are indicated for both nonmenstrual attacks and for migraine attacks associated with menstruation. For the acute treatment of mild to moderate migraine attacks, simple analgesics or oral nonsteroidal anti-inflammatory drugs (NSAIDs), often in combination with antiemetics, are recommended. Triptans are indicated for the treatment of moderate or severe attacks. Head-to-head studies do not show superiority of one triptan over any other.37 There is some evidence to recommend a combination of a triptan and an NSAID.38,39 In all cases, treatment should be tailored, taking into account individual preferences, comorbidities, and risk of adverse events (AEs).

Studies conducted using the International Classification of Headache Disorders (ICHD)-2 diagnostic criteria40 support MM as a distinct clinical entity, with more associated symptoms, longer duration, greater severity, great susceptibility to relapse, greater resistance to treatment, and greater disability than migraine occurring at other times of the menstrual cycle.21,25,26,4145

Prophylaxis

Women who have regular periods and a predictable relationship between migraine and menstruation can be offered short-term perimenstrual prophylaxis. Perimenstrual prophylaxis is particularly suited to those women have inadequate relief from acute therapy. Short-term prevention strategies have the advantage that treatment is only used at the time of need, thus avoiding continuous exposure to active drug and the potential for AEs associated with daily prophylaxis.46 The most commonly recommended strategies include triptans, NSAIDs, and hormone manipulation.47

Frovatriptan

Mechanism of action

The symptoms of headache and allodynia in migraine are thought to arise from activation of the trigeminovascular system and subsequent release of vasoactive neuropeptides, resulting in vasodilation of the meningeal blood vessels, plasma protein extravasation, and sensitization of central trigeminal neurons.48

Frovatriptan, in common with other triptans, is a serotonin (5-hydroxytryptamine, 5HT) 1B/1D receptor agonist. Activation of these receptors is thought to relieve the symptoms of migraine through vasoconstriction of distended intracranial extracerebral vessels (by a direct effect on vascular smooth muscle), inhibition of the release of vasoactive neuropeptides by trigeminal terminals innervating the intracranial vessels and dura mater, and inhibition of nociceptive neurotransmission within the trigeminocervical complex in the brainstem and upper spinal cord.49

Frovatriptan also shows moderate affinity with 5HT7 receptors. This results in more potent contraction of cerebral arteries than coronary arteries, with the potential for good efficacy and low risk of unwanted effects. Frovatriptan is distinctive from other triptans due to its long elimination half-life of 26 hours, which confers a longer duration of action.

Efficacy in clinical trials

Pooled data from two large-scale dose-finding studies demonstrated that frovatriptan was effective and well tolerated across a broad dose range of 0.5 mg to 40 mg.50 A dose of 2.5 mg was identified as providing optimal efficacy versus (vs) tolerability.

Frovatriptan 2.5 mg was further evaluated in three large double-blind, placebo-controlled RCTs.51 These were multicenter, double-blind, placebo-controlled, parallel-group RCTs treating up to three migraine attacks with frovatriptan. Patients included adult men and women with documented 12-month histories of migraine with or without aura as defined by the International Headache Society. The primary efficacy endpoint was 2-hour headache response. In two of the studies, 24-hour headache relapse after a response at 4 hours postdose was an additional primary endpoint.

Frovatriptan was consistently superior to placebo, with headache response at 2 and 4 hours following frovatriptan around twice that for placebo. Among the three studies, the 2-hour headache response (defined as change from moderate or severe headache to mild or none) was 37% to 46% following frovatriptan compared with 21% to 27% for placebo (P<0.001); the 4-hour headache response was 56% to 65% following frovatriptan compared with 31% to 38% for placebo (P<0.001). Pain-free rates at 2 hours were 9% to 14% following frovatriptan compared with 2% to 3% for placebo (P<0.001); the 4-hour pain-free response rate improved to 27% to 32% following frovatriptan compared with 9% to 14% for placebo (P≤0.001).

Associated symptoms of nausea, photophobia, and phonophobia were significantly improved with frovatriptan compared with placebo treatment at 4 hours postdose. No or mild functional impairment was reported by 57% to 64% patients following frovatriptan compared with 36% to 43% for placebo. The median time to meaningful relief of migraine was between 6 and 12 hours following frovatriptan compared with between 14 and 17 hours following placebo.

Recurrence, a major cause of persistent disability among migraineurs, appears to be lower with frovatriptan than with other triptans. In an analysis of all seven triptans, frovatriptan exhibited the lowest mean recurrence rate (17%; range, 7%–25%) (Figure 1).52

Figure 1 Headache recurrence vs half-life for different triptans, after 2 hours.
Notes: Copyright © 2003, John Wiley and Sons. Reproduced with permission from Géraud G, Keywood C, Senard JM. Migraine headache recurrence: relationship to clinical, pharmacological, and pharmacokinetic properties of triptans. Headache. 2003;43(4):376–388;52 after 4 hours.

About one-third of patients respond within 1.5 hours of dosing, and this response is maintained with long-term use.51,53 Further, early use of frovatriptan results in a higher, earlier, and sustained pain-free response, prevents progression to moderate/severe headache, and reduces pain burden and functional disability.54 The need for fewer doses to treat migraine has significant personal benefits as well as being cost effective.55

Comparison of efficacy with other “triptans”

Three placebo-controlled, two-way crossover RCTs compared frovatriptan 2.5 mg with almotriptan 12.5 mg, rizatriptan 10 mg, or zolmitriptan 2.5 mg.5658 Patients were randomized to frovatriptan or the comparator triptan and were instructed to take treatment as soon as possible after the onset of migraine; a second dose could be taken for lack of response within 2 hours. After treating up to three attacks in no more than 3 months, patients were switched to the other treatment for a further three attacks in no more than 3 months. In the pooled data from the three studies, 346 patients were included in the intention-to-treat analysis.59 The rate of pain-free episodes at 2 hours was 30% with frovatriptan and 34% with the comparators (P= nonsignificant [NS]); 2-hour pain relief was 55% for frovatriptan and 59% for the comparators (P=NS). Sustained pain-free episodes at 48 hours were also similar between the two groups (22% for frovatriptan vs 21% for the comparators). However, the relapse rate was significantly lower following treatment with frovatriptan (27%) vs the comparators (40%) (P<0.001).

Safety and tolerability

Data from 1,702 patients in two Phase III trials of frovatriptan 2.5 mg for acute migraine attacks and 1,487 women in three Phase III trials of frovatriptan for short-term prophylaxis of MM have been reviewed to assess the safety and tolerability.60 The short-term prophylaxis analysis included data from an open-label, noncomparative study of up to 12 perimenstrual periods (PMPs) treated with frovatriptan.61

The most frequently reported AEs following acute treatment with frovatriptan included nausea, dizziness, fatigue, and headache, which were generally mild or moderate in severity. Similarly, the most frequently reported AEs following perimenstrual prophylaxis with frovatriptan include nausea, dizziness, fatigue, and paresthesia. Results of subgroup analyses of women whose medical histories included comorbidities that might suggest increased cardiovascular risk but who themselves did not have contraindications to frovatriptan, provide preliminary evidence of safety of frovatriptan in this population.

In a direct comparative study, frovatriptan was better tolerated than sumatriptan 100 mg.62 In comparative studies with almotriptan, rizatriptan, and zolmitriptan, fewer drug-related AEs were reported following treatment with frovatriptan (P<0.05), particularly cardiovascular symptoms.59

Drug interactions

Frovatriptan is metabolized by cytochrome P450 (CYP)1A2 but does not inhibit or induce this or other CYP isoenzymes. Hence, the risks of interactions with concomitantly administered drugs are low. In women using combined oral contraceptives (COCs), blood levels of frovatriptan are around 30% higher compared with nonusers, but there is no evidence to support dose adjustment when frovatriptan is used concomitantly with COCs.63

Concomitant use of frovatriptan with any other triptans, ergotamine, or ergotamine derivatives is contraindicated because of the risk of hypertension and coronary artery constriction due to additive vasospastic effects. It is recommended to wait at least 24 hours after any of these drugs before taking frovatriptan and vice versa.

Although frovatriptan is not a substrate for monoamine oxidase (MAO)-A, concomitant use of MAO inhibitors is not recommended since the potential risk of serotonin syndrome or hypertension cannot be excluded. Concomitant use of St John’s wort is also not recommended because of the variability of the potency of different St John’s wort products as marketed and the potential risk of serotonin syndrome.

Contraindications

In line with other triptans, frovatriptan is contraindicated for patients with heart disease, peripheral vascular disease, moderately severe/severe or uncontrolled mild hypertension, severe hepatic impairment, or those with previous history of transient ischemic attack or cerebrovascular accident.

Rationale for perimenstrual dosing regimens

A double blind, placebo-controlled, two-period crossover RCT in healthy premenopausal women (COC and non-COC users) compared 6-day courses of once-daily (QD) and twice-daily (BID) dosing with frovatriptan. Treatment was started 2 days before the anticipated start of a MM headache, in order to have target blood levels of frovatriptan. A loading double-dose was given on the first dosing day, in order to achieve effective blood levels more rapidly: frovatriptan QD (5 mg day 1 and 2.5 mg days 2–6) and BID (5 mg [10 mg total] day 1; 2.5 mg [5 mg total] days 2–6).64 The time to maximum blood concentration was between 2–4 hours. Both frovatriptan regimens achieved steady-state therapeutic blood concentrations by day 2 of treatment. BID dosing maintained more consistent drug concentrations than did QD dosing and was well tolerated.

Search strategy

A literature search strategy was developed for Ovid MEDLINE and PubMed (January 2000 to December 2013), MEDLINE (R) In-Process and other non-indexed citations, the Cochrane Database of Systematic Reviews, and the Cochrane Register of Controlled Trials using the following search terms: “frovatriptan”, “migraine”, “headache”, “menstruation*”, “menstrual migraine”, “menstrually-related migraine”, “controlled clinical trial”, and “randomized controlled trial”. References of the articles identified were also searched. The authors were contacted for additional data, as required.

For inclusion in the review, studies were required to: be written in English; be described as a prospective study with a contemporaneous placebo, untreated, or active treatment control group; diagnose study participants according to the ICHD; and involve the use of frovatriptan as acute or perimenstrual prophylactic treatment.

In crossover studies, only data from the first cycle of treatment were considered, to minimize carryover and dropout effects.

The literature search identified 12 clinical trials, eight relating to acute treatment of MM and four relating to perimenstrual prophylaxis.

Frovatriptan for the acute treatment of menstrual migraine

Included in the review are three post hoc analyses of menstrual attacks of migraine from RCTs of frovatriptan vs active comparators, for the acute treatment of migraine,6567 one study analyzing the same data pooled from the three trials,68 and one post hoc analysis of the pooled data in women with oral contraceptive-induced migraine (OCM).69

Of other trials for the acute treatment of menstrual attacks of migraine not included in the review, there was one non-comparator study of frovatriptan combined with an NSAID,39 one post hoc analysis of an open-label postmarketing surveillance study,70 and one open-label study of women with OCM.71

The three post hoc analyses were of multicenter, double-blind, crossover RCTs of treatment with each trial medication for up to three menstrual attacks within 3 months.5658 Data from women with attacks of migraine without aura occurring on day 1±2 days (ie, days −2 to +3) of menstruation (contraceptive and natural cycles) during the studies were included in the post hoc analyses. Of all women with a menstrual cycle, 24%, 17%, and 32% menstrual attacks occurred in frovatriptan vs almotriptan, rizatriptan, and zolmitriptan studies, respectively. The mean age of the menstruating women was 36±8 years compared with a mean age of 38±10 years in the main studies.

There were no significant between-group differences in pain relief or pain-free response at 2, 4, and 24 hours (Table 2, Figures 2 and 3). There were significant differences between frovatriptan and almotriptan, rizatriptan, and zolmitriptan for 24-hour relapse (Table 2), 24-hour and 48-hour sustained pain-free response (Figure 3), 24-hour and 48-hour sustained pain-free response (Figure 3), and 24-hour and 48-hour relapse (Table 2 and Figure 4). Compared with the comparator triptans, the number needed to treat (NNT) for frovatriptan was 7.6 (4.8 to 17.1) for relapse at 24 hours, 3.0 (2.0 to 6.3) for relapse at 24 hours following pain-free response at 2 hours, 8.6 (5.1 to 26.2) for relapse at 48 hours, and 4.0 (2.4 to 10.8) for relapse at 48 hours following pain-free response at 2 hours.

Table 2 Clinical trials of frovatriptan for acute treatment of menstrual migraine: post hoc analyses of three placebo-controlled RCTs
Notes: Pain relief: decrease in migraine from severe or moderate to mild or no headache. Pain-free: absence of migraine 2 hours after intake of one dose of study drug ± rescue medication. Relapse: migraine occurring 24 hours after the previous episode, with a migraine-free period between the two attacks.
Abbreviations: NS, nonsignificant; RCT, randomized controlled trial.

Figure 2 Pain relief following treatment with frovatriptan versus almotriptan, rizatriptan, or zolmitriptan.
Abbreviations: CI, confidence interval; df, degrees of freedom; M-H, Mantel-Haenszel.

Figure 3 Pain-free response following treatment with frovatriptan versus almotriptan, rizatriptan, or zolmitriptan.
Abbreviations: CI, confidence interval; df, degrees of freedom; M-H, Mantel-Haenszel.

Figure 4 Relapse following 2-hour pain-free response after treatment with frovatriptan versus almotriptan, rizatriptan, or zolmitriptan.
Abbreviations: CI, confidence interval; df, degrees of freedom; M-H, Mantel-Haenszel.

There was no statistically significant difference in the rate of attacks associated with drug-related AEs between frovatriptan (5%) and the comparator triptans (4%).

In the subgroup analysis of OCMM, the mean age of women with OCMM was 35±9 years compared with 34±7 years for women with non-OCMM.69 There were no statistically significant differences between frovatriptan and comparator triptans for pain relief at 2 and 24 hours, and for pain-free response at 2 hours; significantly more women treated with frovatriptan were pain-free at 24 hours and had lower relapse rates at 24 and 48 hours (Table 2).

Frovatriptan for perimenstrual prophylaxis of menstrual migraine

Two RCTs of frovatriptan vs placebo for perimenstrual prophylaxis of MM72,73 and one post hoc efficacy analysis74 were included in the review. An open-label comparator study was not reviewed.75

In a double blind, placebo-controlled, three-way crossover RCT, 579 women with MM treated each of three PMPs with frovatriptan 2.5 mg QD, frovatriptan 2.5 mg BID, and placebo.72 In this study, which predated ICHD-2, MM was defined as migraine occurring between days −2 and +4 of menstruation, where day 1 is the first day of menstruation. Treatment was started 2 days before the anticipated MM attack and taken for 6 days. The primary endpoint was incidence of MM headache during the treated PMP. Secondary endpoints were severity and duration of MM headache, incidence of MM-associated symptoms, severity of functional disability, use of rescue medication, and patient rating of study drug effectiveness.

Women migraineurs aged 18 years were eligible if they had MM during at least three of four PMPs in the previous year and had at least a 1-year history of MM. They also had to have regular menstrual cycles (28±4 days) and be able to predict the onset of MM attacks. Treatment was taken BID for 6 days, starting on days −4 to +2 of menstruation. On the first day of dosing, women received a double-loading dose of study medication.

The mean age of the study population was 37.6 years (range 18–56). The incidence of MM was significantly reduced with both frovatriptan QD and BID vs placebo and for BID vs QD (Table 3). Both frovatriptan regimens were associated with reduced MM severity (P<0.0001), duration (P<0.0001), and the use of rescue medication (P<0.01 [QD] and P<0.0001 [BID]).

Table 3 Clinical trials of frovatriptan for perimenstrual prophylaxis
Abbreviations: BID, twice daily; ITT, intention to treat; MM, menstrual migraine (pure menstrual or menstrually-related migraine); PCB, placebo; PMP, perimenstrual period; QD, once daily; RCT, randomized controlled trial; SD, standard deviation; vs, versus.

The incidence and type of AEs were similar to placebo for both regimens. The overall incidence of AEs was 2.7% higher than placebo for frovatriptan QD and 4.1% higher than placebo for frovatriptan BID. The most commonly reported AEs were headache, nausea, dizziness, nasopharyngitis, and dysmenorrhea.

Combined hormonal contraceptives, used by 31% of the study population, did not affect efficacy or tolerability.

Survival analysis of the proportion of patients without migraine headache showed no evidence of delayed or rebound headache following any of the three treatment periods.

In a double-blind, placebo-controlled, parallel-group RCT, 427 women with “difficult to treat” MM treated two consecutive PMPs with placebo; those who experienced MM attacks in at least one of two single-blind PMPs were randomized to treat three PMPs over a 4-month period with either frovatriptan 2.5 mg QD, frovatriptan 2.5 mg BID, or placebo (Table 3).73

Difficult to treat migraine was defined as previous exposure to nontriptan acute and/or prophylactic therapy for treatment of MM and an inadequate response to triptans for the acute treatment of MM over a minimum of two menstrual cycles. An inadequate response to triptans was defined as lack of efficacy or poor tolerability, doses in excess of the maximum recommended amount, the need for rescue medication, relapse of headache within 48 hours, or incomplete response. During PMP dosing, women could take one additional frovatriptan dose per day, except with the loading dose on the first treatment day.

The efficacy analysis included 410 women with a mean age of 38.1 (range 16–58) years; 85% completed three double-blind PMPs.

Frovatriptan was associated with more headache-free days compared with placebo (4.2 [BID] and 4.0 [QD] vs 3.6 [placebo]) (P≤0.0001). Headache severity was reduced with frovatriptan QD (P≤0.01) and BID (P≤0.001) vs placebo. Associated symptoms of photophobia and phonophobia were decreased with frovatriptan QD and BID (P<0.01); nausea was reduced with BID dosing (P<0.001).

Over all treated PMPs, the percentage of patients with functional impairment was decreased with frovatriptan compared with placebo (71% [BID] and 78% [QD] vs 93% [placebo]) (P<0.001).

Both frovatriptan regimens were equally well tolerated. Possible or probably related AEs were reported by 32% of patients taking frovatriptan QD, 24% taking BID, and 19% placebo. The most commonly reported AEs were upper respiratory tract infection, nausea, and dizziness. The incidence of severe AEs was low and appeared unrelated to treatment. One patient in the placebo group had an inguinal hernia, and another patient randomized to placebo experience prolonged chest discomfort, which resolved with ranitidine.

Kaplan–Meier analysis of the time to first migraine during the PMP and in the 5 days immediately following dosing showed no evidence of delayed or rebound headache following treatment.

COCs were used by 30% of women taking frovatriptan 2.5 mg QD, 24% taking frovatriptan 2.5 mg BID, and 35% taking placebo. There was no difference in outcome in COC users compared to overall study population.

In a combined analysis of the two trials, both frovatriptan 2.5 mg QD and BID were more effective than placebo in reducing migraine frequency (Figure 5). The NNT was 4.2 (3.5 to 5.4) for frovatriptan 2.5 mg QD vs placebo, 4.2 (3.5 to 5.4) for frovatriptan 2.5 mg BID vs placebo, and 9.0 (6.0 to 17.8) for frovatriptan 2.5 mg BID vs QD.

Figure 5 Perimenstrual prophylaxis with frovatriptan: incidence of no migraine occurring during the treated perimenstrual period.
Abbreviations: BID, twice daily; CI, confidence interval; df, degrees of freedom; QD, once daily; M-H, Mantel-Haenszel; vs, versus.

Conclusion

MM is a common and disabling condition. The specific characteristics of MM attacks, particularly the longer duration and increased relapse rate compared with non-MM attacks, present challenges for treatment efficacy.

Post hoc analyses from RCTs of menstrual attacks of migraine show similar pain relief and pain-free rates for frovatriptan compared with other triptans but significantly lower relapse rates and sustained pain-free response rates at both 24 hours and 48 hours postdosing.

Data from RCTs for perimenstrual prophylaxis show a significant reduction in risk of MM in women using frovatriptan 2.5 mg QD or BID for 6 days compared with placebo, with no evidence of delayed or rebound headache following treatment.

Across all clinical trials, frovatriptan was well tolerated, with a low incidence of drug-related AEs.

These findings support the use of frovatriptan as a first-line treatment for both the acute treatment and for perimenstrual prophylaxis of MM.

Disclosure

Professor MacGregor has acted as a paid consultant to and/or her department has received research funding from Addex Therapeutics, Allergan, AstraZeneca, Bayer Healthcare, BTG International Limited, Endo Pharmaceuticals, GlaxoSmithKline, the Menarini Group, Merck and Co, Pozen, and UniPath. The author reports no other conflicts of interest in this work.


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