Propoxyphene napsylate belongs on the narcotic class of medicines which act as delicate analgesics and acetaminophen is usually a non-narcotic, weak agony reliever, fever reducer (antipyretic) and enhances the effects of propoxyphene. Darvocet has been discontinued within the U.S. because of basic safety considerations with regards to coronary heart toxicity. https://caretechpharmacy.com