Do not stop using methadone
suddenly, or you could have unpleasant withdrawal symptoms
. Call your doctor if you miss doses or forget to take this medication for longer than 3 days in a row. Do not drink alcohol while you are taking methadone. Dangerous side effects or death can occur when alcohol is combined with methadone. Check your food and medicine labels to be sure these products do not contain alcohol. Methadone can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.