What is "tacrine"

n. A parasympathomimetic anticholinesterase, one of the first approved for the treatment of Alzheimer's disease.

Tacrine is a centrally acting anticholinesterase and indirect cholinergic agonist ( parasympathomimetic). It was the first centrally acting cholinesterase inhibitor approved for the treatment of Alzheimer's disease, and was marketed under the trade name Cognex. Tacrine was first synthesised by Adrien Albert at the University of Sydney. It also acts as a histamine N-methyltransferase inhibitor.