I commend your desire to help your father. Medication-assisted treatment can be highly effective, but the specific medicine depends entirely on the substance he is using. For opioid addiction, medications like Buprenorphine, Methadone, or Naltrexone are commonly prescribed. For alcohol addiction, options include Acamprosate or Naltrexone. There is no single pill to cure addiction; these medications must be prescribed by a healthcare professional as part of a comprehensive plan that includes counseling and behavioral therapy. Please consult an addiction specialist or a primary care physician who can safely evaluate your father and guide his recovery journey.