Buy Now:--https://cosmodix.com/pain-relief/dilaudid-4-mg/ Pill with imprint M 4 is White, Round and has been identified as Hydromorphone Hydrochloride 4 mg.As an opioid, Dilaudid m 4 pills works by binding to opioid receptors in the brain and spinal cord, altering the perception of pain and producing feelings of euphoria and sedation. It’s available in various forms, including tablets, oral solutions, and injectable formulations, allowing for flexible administration based on the patient’s needs and condition severity.