<unk>  is an antitussive that is FDA approved for the treatment of cough.   Common adverse reactions include dizziness, somnolence, fatigue.
Dextromethorphan hydrobromide
Tricaine mesylate
Proparacaine
Acetyldihydrocodeine
Procaine
Medetomidine hydrochloride
Dihydrodesoxymorphine
Oxetacaine