What side effects may I notice from receiving Belviq?

Side effects that you should report to your doctor or health care professional as soon as possible:

-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-abnormal production of milk
-breast enlargement in both males and females
-breathing problems
-changes in emotions or moods
-changes in vision
-confusion
-fast or irregular heart beat
-feeling faint or lightheaded, falls
-fever or chills, sore throat
-hallucinations
-high or low blood pressure
-males: prolonged or painful erection lasting more than 4 hours
-menstrual changes
-restlessness
-signs and symptoms of low blood sugar such as feeling anxious; confusion; dizziness; increased hunger; unusually weak or tired; increased sweating; shakiness; cold, clammy skin; irritable; headache; blurred vision; fast heartbeat; loss of consciousness
-slow or irregular heartbeat
-stiff muscles
-sweating
-suicidal thoughts
-swelling of the ankles, feet, hands
-unusually weak or tired
-vomiting
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-back pain
-constipation
-dizziness
-dry mouth
-headache
-nausea
-tiredness

This list may not describe all possible side effects for Belviq. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.