Avomine tablets provide fast acting and long lasting relief that gets to work quickly and lasts for up to 24 hours one dose is generally well tolerated and can even be used by children from 5 years they contain the active ingredient promethazine which is an antihistamine agen that blocks histamine receptors in the stomach to prevent nausea and vomiting in a numebr of different cases it also features a sedative effect that may contribute to its anti sickeness action these tablets can be used