<unk>  is a drug which acts as an opioid agonist. It is a metabolite of the acetylcholinesterase inhibitor physostigmine but unlike physostigmine, the acetylcholinesterase inhibition produced by<unk>  is weak and easily reversible, and it produces fairly potent analgesic effects mediated through the μ-opioid receptor. This mixture of activities gives<unk>  an unusual pharmacological profile, although its uses are limited by side effects such as respiratory depression and neurotoxicity.
Eseroline
Isoprocarb
Cevimeline
Conestat alfa
Fluoxymesterone
Prenalterol
Masoprocol
Pemoline