Do not suddenly stop taking this medicine because it may cause withdrawal. The risk of withdrawalis higher in people who have used it for a long time or in high doses. Your doctor may reduce your dosage slowly to prevent withdrawal. The withdrawal symptoms include restlessness, mental or mood changessuch as anxiety, trouble sleeping or suicidal thoughts, runny nose, watering eyes, nausea, diarrhea, sweating, muscle aches, or sudden behavior changes.