Placebo to match telcagepant 140 mg film coated tablet for oral administration

Participants completed a headache diary each evening at bedtime, including recording headache duration and acute headache medication use. Mean monthly headache days was calculated from diary data. A headache day was defined as a day in which a headache (defined as headache pain ≥30 minute duration or requiring acute treatment) started, ended, or recurred. Headache pain persisting for more than 1 calendar day after initial onset was considered an occurrence of additional headache days. Mean monthly rate was adjusted to 28 days. Participant subgroups (based on symptoms over the 3 menstrual cycles prior to study): PMM - In ≥2 out of 3 cycles attacks occur exclusively on Day 1 ± 2 of menstruation and at no other times of the cycle; MRM - In ≥2 out of 3 cycles attacks occur on Day 1 ± 2 of menstruation and additionally at other times of the cycle.

Participants completed a headache diary each evening at bedtime, including recording headache duration and acute headache medication use. Mean monthly on-drug headache days was calculated from diary data. "On-drug" headache day was a day, which had a valid diary entry and which followed a study drug dosing day, in which a headache (defined as headache pain ≥30 minute duration or requiring acute treatment) started, ended, or recurred. Headache pain persisting for more than 1 calendar day after initial onset into additional qualifying days (i.e., day following dosing day) was considered an occurrence of additional headache days. Mean monthly rate was adjusted to 7 days. Participant subgroups (based on symptoms over the 3 menstrual cycles prior to study): PMM - In ≥2 out of 3 cycles attacks occur exclusively on Day 1 ± 2 of menstruation and at no other times of the cycle; MRM - In ≥2 out of 3 cycles attacks occur on Day 1 ± 2 of menstruation and additionally at other times of the cycle.

Participants completed a headache diary each evening at bedtime, including recording headache duration and acute headache medication use. Mean monthly on-drug headache days was calculated from diary data. "On-drug" headache day was a day, which had a valid diary entry and which followed a study drug dosing day, in which a headache (defined as headache pain ≥30 minute duration or requiring acute treatment) started, ended, or recurred. Headache pain persisting for more than 1 calendar day after initial onset into additional qualifying days (i.e., day following dosing day) was considered an occurrence of additional headache days. Mean monthly rate was adjusted to 7 days. MRM participant subgroup (based on symptoms over the 3 menstrual cycles prior to study) - In ≥2 out of 3 cycles attacks occur on Day 1 ± 2 of menstruation additionally at other times of the cycle.

Participants completed a headache diary each evening at bedtime, including recording headache duration and acute headache medication use. Mean monthly on-drug headache days was calculated from diary data. "On-drug" headache day was a day, which had a valid diary entry and which followed a study drug dosing day, in which a headache (defined as headache pain ≥30 minute duration or requiring acute treatment) started, ended, or recurred. Headache pain persisting for more than 1 calendar day after initial onset into additional qualifying days (i.e., day following dosing day) was considered an occurrence of additional headache days. Mean monthly rate was adjusted to 7 days. PMM participant subgroups (based on symptoms over the 3 menstrual cycles prior to study) - In ≥2 out of 3 cycles attacks occur exclusively on Day 1 ± 2 of menstruation and at no other times of the cycle.

Total of all reporting groups

Placebo was administered once daily at bedtime for 7 consecutive days each month, beginning at the onset of menses, for up to 6 months. Dosing could begin up to 3 days prior to menses onset if prodromal symptoms reliably predicted onset of menses.

An AE is defined as any unfavorable and unintended change in the structure, function, or chemistry of the body temporally associated with the use of the study drug, whether or not considered related to the use of the study drug. Any worsening (i.e., any clinically significant adverse change in frequency and/or intensity) of a preexisting condition which is temporally associated with the use of the study drug, is also an AE. A clinical AE is an AE reported as a result of a clinical examination or reported by the participant.

APaT population, which included all randomized participants who took at least one dose of study drug. Participants were included in the treatment arm corresponding to the study treatment actually taken. Participants who took both study treatments were included in the telcagepant 140 mg treatment arm.

An AE is defined as any unfavorable and unintended change in the structure, function, or chemistry of the body temporally associated with the use of the study drug, whether or not considered related to the use of the study drug. Any worsening (i.e., any clinically significant adverse change in frequency and/or intensity) of a preexisting condition which is temporally associated with the use of the study drug, is also an AE. A laboratory AE is an AE reported as a result of a laboratory assessment or test.

APaT population, which is all randomized participants who took at least one dose of study drug. Also to be included participant must have at least one post-baseline lab test. Participants were included in arm corresponding to the treatment actually taken. Participants who took both treatments were included in the telcagepant 140 mg treatment arm.

An AE is defined as any unfavorable and unintended change in the structure, function, or chemistry of the body temporally associated with the use of the study drug, whether or not considered related to the use of the study drug. Any worsening (i.e., any clinically significant adverse change in frequency and/or intensity) of a preexisting condition which is temporally associated with the use of the study drug, is also an AE. A laboratory AE is an AE reported as a result of a laboratory assessment or test.

APaT population, which is all randomized participants who took at least one dose of study drug. Also to be included participant must have at least one post-baseline lab test. Participants were included in arm corresponding to the treatment actually taken. Participants who took both treatments were included in the telcagepant 140 mg treatment arm.

Participants completed a headache diary each evening at bedtime, including recording headache duration and acute headache medication use. Mean monthly headache days was calculated from diary data. A headache day was defined as a day in which a headache (defined as headache pain ≥30 minute duration or requiring acute treatment) started, ended, or recurred. Headache pain persisting for more than 1 calendar day after initial onset was considered an occurrence of additional headache days. Mean monthly rate was adjusted to 28 days. Participant subgroups (based on symptoms over the 3 menstrual cycles prior to study): PMM - In ≥2 out of 3 cycles attacks occur exclusively on Day 1 ± 2 of menstruation and at no other times of the cycle; MRM - In ≥2 out of 3 cycles attacks occur on Day 1 ± 2 of menstruation and additionally at other times of the cycle.

All randomized participants who were randomized only once, took at least 1 dose of study drug, had ≥1 post-randomization efficacy measurement, met the definition of the MRM or PMM subgroup and reported average of ≥5 moderate-severe migraine headaches/month at baseline. Participant must have ≥1 month with ≥4 dosing days and ≥7 diary days.

Participants completed a headache diary each evening at bedtime, including recording headache duration and acute headache medication use. Mean monthly headache days was calculated from diary data. A headache day was defined as a day in which a headache (defined as headache pain ≥30 minute duration or requiring acute treatment) started, ended, or recurred. Headache pain persisting for more than 1 calendar day after initial onset was considered an occurrence of additional headache days. Mean monthly rate was adjusted to 28 days. MRM participant subgroup (based on symptoms over the 3 menstrual cycles prior to study) - In ≥2 out of 3 cycles attacks occur on Day 1 ± 2 of menstruation and additionally at other times of the cycle.

All randomized participants who were randomized only once, took at least 1 dose of study drug, had ≥1 post-randomization efficacy measurement, met the definition of the MRM subgroup and reported average of ≥5 moderate-severe migraine headaches/month at baseline. Participant must have ≥1 month with ≥4 dosing days and ≥7 diary days.

Participants completed a headache diary each evening at bedtime, including recording headache duration and acute headache medication use. Mean monthly on-drug headache days was calculated from diary data. "On-drug" headache day was a day, which had a valid diary entry and which followed a study drug dosing day, in which a headache (defined as headache pain ≥30 minute duration or requiring acute treatment) started, ended, or recurred. Headache pain persisting for more than 1 calendar day after initial onset into additional qualifying days (i.e., day following dosing day) was considered an occurrence of additional headache days. Mean monthly rate was adjusted to 7 days. Participant subgroups (based on symptoms over the 3 menstrual cycles prior to study): PMM - In ≥2 out of 3 cycles attacks occur exclusively on Day 1 ± 2 of menstruation and at no other times of the cycle; MRM - In ≥2 out of 3 cycles attacks occur on Day 1 ± 2 of menstruation and additionally at other times of the cycle.

All randomized participants who were randomized only once, took at least 1 dose of study drug, had ≥1 post-randomization efficacy measurement, met the definition of the MRM or PMM subgroup and reported average of ≥5 moderate-severe migraine headaches/month at baseline. Participant must have ≥1 month with ≥4 dosing days.

Participants completed a headache diary each evening at bedtime, including recording headache duration and acute headache medication use. Mean monthly on-drug headache days was calculated from diary data. "On-drug" headache day was a day, which had a valid diary entry and which followed a study drug dosing day, in which a headache (defined as headache pain ≥30 minute duration or requiring acute treatment) started, ended, or recurred. Headache pain persisting for more than 1 calendar day after initial onset into additional qualifying days (i.e., day following dosing day) was considered an occurrence of additional headache days. Mean monthly rate was adjusted to 7 days. MRM participant subgroup (based on symptoms over the 3 menstrual cycles prior to study) - In ≥2 out of 3 cycles attacks occur on Day 1 ± 2 of menstruation additionally at other times of the cycle.

All randomized participants who were randomized only once, took at least 1 dose of study drug, had ≥1 post-randomization efficacy measurement, met the definition of the MRM subgroup and reported average of ≥5 moderate-severe migraine headaches/month at baseline. Participant must have ≥1 month with ≥4 dosing days.

Participants completed a headache diary each evening at bedtime, including recording headache duration and acute headache medication use. Mean monthly on-drug headache days was calculated from diary data. "On-drug" headache day was a day, which had a valid diary entry and which followed a study drug dosing day, in which a headache (defined as headache pain ≥30 minute duration or requiring acute treatment) started, ended, or recurred. Headache pain persisting for more than 1 calendar day after initial onset into additional qualifying days (i.e., day following dosing day) was considered an occurrence of additional headache days. Mean monthly rate was adjusted to 7 days. PMM participant subgroups (based on symptoms over the 3 menstrual cycles prior to study) - In ≥2 out of 3 cycles attacks occur exclusively on Day 1 ± 2 of menstruation and at no other times of the cycle.

All randomized participants who were randomized only once, took at least 1 dose of study drug, had ≥1 post-randomization efficacy measurement, met the definition of the PMM subgroup and reported average of ≥3 moderate-severe migraine headaches/month at baseline. Participant must have ≥1 month with ≥4 dosing days.

Placebo was administered once daily at bedtime for 7 consecutive days each month, beginning at the onset of menses, for up to 6 months. Dosing could begin up to 3 days prior to menses onset if prodromal symptoms reliably predicted onset of menses.