Avomine tablets 25mg contains the active ingredient promethazine theoclate which is an antihistamine mostly used for preventing travel sickness and nausea it can also be used in the treatment and prevention of travel sickness nausea vomiting vertigo vestibular disturbance migraine avomine tablets 25mg can provide up to 24 hours relief in one dose and is generally well tolerated and can be used by children from 5 years the active ingredient promethazine works by blocking histamine from bi