He had heavy fire in 1978, consumer groups, who said Darvon has been associated with suicide. Darvocet: United States, dextropropoxyphene HCl is available as a prescription preparation of acetaminophen tylenol is the ratio of 30 mg / 600 mg to 100 mg / 650mg respectively. In its pure form, dextropropoxyphene is commonly used to alleviate opiate withdrawal symptoms. Dextropropoxyphene / paracetamol test: different techniques are available for testing drugs and Dextropropoxyphenes and / or acetaminophen-containing compounds are no exception.