<unk>  is an antitussive agent that is FDA approved for the treatment of cough.   Common adverse reactions include constipation, nausea, vomiting, asthenia, dizziness, somnolence.
Hydrocodone bitartrate and Homatropine methylbromide
Ergotamine and caffeine 
Brompheniramine maleate and Pseudoephedrine hydrochloride
Isometheptene, caffeine and acetaminophen
Diphenoxylate hydrochloride/Atropine sulfate
Diphenoxylate hydrochloride and atropine sulfate
Hydrocodone bitartrate and acetaminophen
Thonzylamine hydrochloride and chlophedianol hydrochloride