Proheptazine is a substituted azacycloalkane patented by American Home Products Corp. as an opioid analgesic. Proheptazine produces similar effects to other opioids, including analgesia, sedation, euphoria, dizziness and nausea.

Proheptazine:
https://drugs.ncats.io/drug/S23189WW7E

Proheptazine :
https://ncit.nci.nih.gov/ncitbrowser/pages/concept_details.jsf?dictionary=NCI_Thesaurus&version=20.11e&code=C66477&ns=ncit&type=all&key=null&b=1&n=0&vse=null

• An opioid analgesic
• Invented in the 1960s
• 2013 annual aggregate manufacturing quota of zero