Promethazine hydrochloride is an anti-histamine with strong sedative effects. It is used as a sedative and to combat hay fever, allergic reactions, nausea and vomiting.Amber coloured glass ampoule with yellow band on neck and teal coloured print on glass containing 50mg in 2ml of Hermethazine [promethazine hydrochloride].Printed on glass in teal: CAUTION S4 / HERMETHAZINE / PROMETHAZINE / HYDROCHLORIDE / 50mg in 2ml / DAVID BULL / EXP APR 81hermethazine, anti-histamine, sedative, hay fever, allergies, nausea