Midrid Capsules Midrid Capsules treat migraines & throbbing headaches in adults. They contains two active ingredients to relieve the pain & stop the migraine: Paracetamol: an analgesic (painkiller) to relieve the pain. Isometheptene Mucate: the throbbing pain sometimes felt during a migraine is linked to swollen blood vessels (vasodilation) in the head, so this ingredient returns the blood vessels to normal to stop the migraine.