What are the side effects of methadone?

The most common side effects of methadone are constipation, dizziness, drowsiness, dry mouth, headache, increased sweating, itching, lightheadedness, nausea, vomiting, and weakness.
Sweating, drowsiness, weight gain to name a few
Side effects of methadone include sweating, constipation, decrease in sex drive, and sugar cravings.