Definition
Phenaphen was a brand name for a combination pain reliever that typically contained acetaminophen and codeine. Codeine is an opioid pain reliever, making Phenaphen stronger than acetaminophen alone. It was prescribed for moderate to severe pain. Due to the risk of opioid dependence, Phenaphen is not as commonly prescribed today. Alternative medications with fewer risks are now often preferred. It is important to note this medication is habit-forming.