What side effects may I notice from receiving Horizant?

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
-breathing problems
-rash, fever, and swollen lymph nodes
-redness, blistering, peeling or loosening of the skin, including inside the mouth
-suicidal thoughts, mood changes

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-dizziness
-drowsiness
-headache
-nausea, vomiting
-swelling of ankles, feet, hands
-tiredness

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