Ciramadol

Ciramadol (WY-15705) is an opioid analgesic that was developed in the late 1970s.

Ciramadol is a mixed agonist-antagonist for mu opioid receptors with relatively low abuse potential and a ceiling on respiratory depression which makes it a relatively safe drug. It has a slightly higher potency and effectiveness as an analgesic than codeine, but is weaker than morphine. Other side effects include sedation and nausea but these are generally less severe than with other similar drugs.