Mecamylamine (hydrochloride)- 13 C 4 , 15 N is the 13 C-labeled and 15 N-labeled Mecamylamine hydrochloride. Mecamylamine hydrochloride is an orally active, nonselective, noncompetitive nAChR antagonist that can treat various neuropsychiatric disorders.Mecamylamine hydrochloride is originally used as a ganglionic blocker in treating hypertension. Mecamylamine hydrochloride can easily crosses the blood-brain barrier.