What side effects can this medication cause?  

Sibutramine may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

• headache
• change in appetite
• constipation
• heartburn
• dry mouth
• weakness
• back pain
• nervousness
• difficulty falling asleep or staying asleep
• runny nose
• flu-like symptoms
• flushing
• painful menstrual periods

Some side effects can be serious. The following symptoms are uncommon, but if you experience any of them, call your doctor immediately:

• fast or pounding heart beat
• chest pain
• shortness of breath
• upset stomach
• stomach pain
• vomiting
• extreme excitement
• restlessness
• anxiety
• depression
• dizziness
• lightheadedness
• fainting
• confusion
• uncoordinated or abnormal movement
• muscle stiffness
• shaking hands that you cannot control
• seizures
• shivering
• excessive sweating
• fever
• sore throat
• large pupils (black area in center of eyes)
• change in vision
• eye pain
• hives
• skin rash
• itching
• difficulty speaking, breathing, or swallowing
• hoarseness
• swelling of the face, throat, tongue, lips, eyes, hands, feet, ankles, or lower legs
• unusual bleeding or bruising

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

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online at http://www.fda.gov/MedWatch/report.htm or by phone 1-800-332-1088.