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MinorCompletion date: Nov 6, 2026 to Nov 16, 2026v37
MinorPrimary completion date changed from estimate of May 27, 2026 to Jun 1, 2026v36
MinorRe-verified, no change to tracked fieldsv35
MinorPrimary completion date: Jun 5, 2026 to May 27, 2026Completion date: Dec 4, 2026 to Nov 6, 2026v34Show 1 more changeShow less
Completion date: Dec 4, 2026 to Nov 6, 2026
MinorRe-verified, no change to tracked fieldsv33
Show 31 earlier versionsHide 31 earlier versions
MinorEnrollment target: estimated 714 to confirmed 751Primary completion date: Jun 22, 2026 to Jun 5, 2026 · Completion date: Dec 21, 2026 to Dec 4, 2026 · Eligibility criteria revised · 2 morev32Show 5 more changesShow less
Primary completion date: Jun 22, 2026 to Jun 5, 2026
Minor2 versionsRe-verified since Aug 5, 2024, no change to tracked fieldsv14-v15
MinorStudy sites: 65 to 66v13
MinorRe-verified, no change to tracked fieldsv12
NotablePrimary completion date: Jul 31, 2025 to Jun 22, 2026Study sites: 35 to 65 · Completion date: Dec 31, 2025 to Dec 21, 2026v11Show 2 more changesShow less
Study sites: 35 to 65
Completion date: Dec 31, 2025 to Dec 21, 2026
MinorStudy sites: 40 to 35v10
MinorStudy sites: 26 to 40v9
Minor2 versionsRe-verified since Jan 30, 2024, no change to tracked fieldsv7-v8
MinorStudy sites: 7 to 26Primary completion date: Jan 26, 2026 to Jul 31, 2025 · Completion date: Jan 26, 2026 to Dec 31, 2025 · Interventions: Dysport® (Biological), Dysport® (Biological), Dysport® (Biological), Dysport® (Biological), Placebo (Other) to Botulinum toxin type A (Biological), Botulinum toxin type A (Biological), Botulinum toxin type A (Biological), Botulinum toxin type A…v6Show 3 more changesShow less
Primary completion date: Jan 26, 2026 to Jul 31, 2025
Completion date: Jan 26, 2026 to Dec 31, 2025
Interventions: Dysport® (Biological), Dysport® (Biological), Dysport® (Biological), Dysport® (Biological), Placebo (Other) to Botulinum toxin type A (Biological), Botulinum toxin type A (Biological), Botulinum toxin type A (Biological), Botulinum toxin type A…
MinorRe-verified, no change to tracked fieldsv5
MinorSite details revised at 3 of 7 sitesv4
NotableTrial status: Not Yet Recruiting to RecruitingPrimary completion date: Jun 1, 2025 to Jan 26, 2026 · Study sites: 0 to 7 · Start date changed from estimate of Sep 2023 to Sep 29, 2023v3Show 3 more changesShow less
Primary completion date: Jun 1, 2025 to Jan 26, 2026
Study sites: 0 to 7
Start date changed from estimate of Sep 2023 to Sep 29, 2023
Stopped: an ongoing trial was terminated, suspended or withdrawn.
Notable: the trial’s plan changed such as a big move in its timeline or size, a new primary endpoint, sponsor or phase, or recruiting opened or resumed.
Minor: routine progress and housekeeping, such as sites added or enrollment closed.
The purpose of this study is to understand the safety and effectiveness of the study drug, Dysport® when compared with placebo in preventing episodic migraine.
A migraine is a headache with severe throbbing pain or a pulsating sensation, usually on one side of the head, and is often accompanied by feeling or being sick and a sensitivity to bright lights and sound.
Episodic Migraine is defined as having less than 15 days of headache a month with at least 6 days with migraine headaches.
Migraines are caused by a series of events which cause the brain to get stimulated / activated, which results in the release of chemicals that cause pain.
Dysport® is a formulation of Botulinum toxin type A (BoNT-A), a medication that stops the release of these chemical messengers.
The study will consist of 3 periods:
1. A 'screening period' of 6 to 12 weeks to assess whether the participant can take part to the study and requires 1 visit.
2. A first Treatment Phase of 24 weeks. On Day 1 and at Week 12 of the first Treatment Phase, participants will receive injections into various muscles across the head, neck, face and shoulders.
The injections will contain either a dose "A" or a dose ''B'' of Dysport® or a placebo (an inactive substance or treatment that looks the same as, and is given in the same way as, an active drug or intervention/treatment being studied).
Participants will make 4 visits to the clinic in person and have 4 remote (online) visits.
3. A second Treatment Phase of 24 weeks (extension phase). At Week 24 and at Week 36, all participants will get Dysport® (dose "A" or dose "B").
There will be 3 in person visits and 4 remote visits.
Participants will need to complete an e-diary and questionnaires throughout the study.
Participants will undergo blood samplings, urine collections, physical examinations, and clinical evaluations. They may continue some other medications, but the details need to be recorded.
The total study duration for a participant will be up to 60 weeks (approx. 14 months).