For preventing chronic or episodic migraine in adults who have at least 4 migraine days a month, only if at least 3 preventative treatments have not worked.

For chronic migraine (defined as 15 or more headache days a month) stop treatment after 12 weeks if the frequency of migraines does not reduce by at least 30%.

For episodic migraine (defined as fewer than 15 headache days a month) stop treatment after 12 weeks if the frequency of migraines does not reduce by at least 50%.

PURPLE - For preventing episodic migraine in adults who have at least 4 and fewer than 15 migraine attacks per month, only if at least 3 preventative treatments have not worked.

Stop rimegepant after 12 weeks of treatment if the frequency of migraine attacks does not reduce by at least 50%.

GREEN - For the acute treatment of migraine with or without aura in adults, only if for previous migraines:

1. At least 2 triptans were tried and they did not work well enough or

2. Triptans were contraindicated or not tolerated, and nonsteroidal anti-inflammatory drugs (NSAIDs) and paracetamol were tried but did not work well enough.