<unk> (injection) is a local anesthetic that is FDA approved for the treatment of disorder of dental prosthesis - pain due to any device, implant and/or graft
prophylaxis of endoscopic procedure - pain; insertion of nasogastric tube -pain, otitis - topical local anesthetic, skin irritation - topical local anesthetic, stomatitis - topical local anesthetic, toothache, topical local anesthetic, for general use during catheterization and/or diagnostic and surgical procedures, topical local anesthetic - ulcer of mouth.   Common adverse reactions include contact dermatitis, disorder of taste.
Benzocaine 
Benzidine
Nicotine 
Nicotine
Methamphetamine
Benzphetamine
Phencyclidine
Cannabis 