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You may have breathing issues or withdrawal symptomsif you start or stop taking certain other drugs. Tell your doctor if you also use antibiotics, antifungal medication, heart or blood pressure medication, seizure medication, or medicine to treat HIV or hepatitis C. Opioids can interact with many other medicines and cause dangerous side effectsor death. Make sure to tell your doctor if you also use: other narcotic medication - opioid pain medicineor prescription cough medicinesedatives like Valium, including diazepam, alprazolam,... more

Do not use methadone ifyou are allergic to it, or if you have: breathing problems or severe asthmaa blockage in your stomach or intestines To make sure methadone is safefor you, tell your doctor if you have ever had: breathing problems, sleep apnealiver or kidney diseasebrain tumor, a head injury, or seizuresheart problems, long QT syndrome (in you or a family member)alcohol or drug addiction, or mental illnessurination problemsproblems with yourgallbladder, pancreas, or thyroid Methadone can causea fatal heart rhythm disorde... more