What are the side effects associated with methadone?

Methadone can cause serious side effects like shallow or difficult breathing and an irregular heartbeat. These can be life-threatening. Other side effects include: hallucinations, confusion, dizziness, fainting, chest pain, headaches, weakness, nausea, vomiting, loss of appetite, constipation, weight gain, stomach pain, sweating, dry mouth, flushing, swelling of extremities, vision problems, mood changes, difficulty sleeping, feeling nervous or anxious, decreased sex drive or trouble with orgasm, impotence and missed menstrual periods. Symptoms of an allergic reaction are serious and require immediate medical attention. Call 911, if you experience itching, hives, seizures, rash or swelling of the face, lips, throat or tongue.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.