Methadone Guide: Possible Side Effects
Methadone may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away: drowsiness weakness headache nausea vomiting constipation loss of appetite weight gain stomach pain dry mouth sweating flushing difficulty urinating swelling of the hands, arms, feet, and legs mood changes vision problems difficulty falling asleep or staying asleep decreased sexual desire or ability missed menstrual periods

Some side effects can be serious. If you experience any of the following symptoms or those mentioned in the IMPORTANT WARNING section, call your doctor immediately: seizures itching hives rash

Methadone may cause other side effects. Call your doctor if you have any unusual problems while you are taking this medication.

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Yahoo! Answers

anna i
Q: What are the side effects of methadone?
I know methadone is used by a lot of people who are getting themselves treated for their opioid dependence. It...

A: There are indeed some side effects that methadone is associated with. These are: nausea, pruritus, constipation, sedation, confusion, and respiratory depression. Flushing and excess sweating may also occur in patients who use methadone orally. If the prescription is followed properly by the patient, he wouldn't get addicted to it. Methadone is safe only when it is not abused by the patient.
Lynn D