Dorbene vet 1mg/ml solution for injection for dogs and cats Presentation 1 ml solution for injection contains: Active substance: Medetomidine hydrochloride 1.0 mg (equivalent to 0.85 mg medetomidine). Excipients: Methyl parahydroxybenzoate (E 218) 1.0 mg Propyl parahydroxybenzoate (E 216) 0.2 mg.