The purpose of this protocol is to allow subjects who completed any BHV3000 (rimegepant) clinical study to continue to have access to rimegepant while collecting ongoing safety data.

(NOTE: ONLY FOR PATIENTS who participated in a previous BHV-3000/Rimegepant Clinical Trial in the past)

Inclusion Criteria:

1.Subjects who have completed any BHV3000 (rimegepant) clinical study without significant protocol violations.

Exclusion Criteria:

1. History of basilar migraine or hemiplegic migraine
2. History with current evidence of uncontrolled, unstable or recently diagnosed cardiovascular disease
3. HIV history
4. Uncontrolled hypertension or uncontrolled diabetes
5. Current diagnosis of major depression, other pain syndromes, psychiatric conditions (e.g., schizophrenia), dementia, or significant neurological disorders (other than migraine) that, in the Investigator's opinion, might interfere with study assessments
6. History of gastric, or small intestinal surgery, or has a disease that causes malabsorption