Answer
It treats nausea and vomiting associated with migraine; it is not a painkiller for the headache.
Sources for this answer
- Prochlorperazine maleate 3 mg Buccal Tablet-P/Almus Migraine Relief 3mg Buccal Tablets — Current selected SmPCemc · Summary of Product Characteristics
- Buccastem M — Current selected SmPCemc · Summary of Product Characteristics
- NHS