Get emergency medical help if you have signs of an allergic reaction to Namenda: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
severe headache, blurred vision, pounding in your neck or ears;
seizure (convulsions); or
unusual changes in mood or behavior.
Common Namenda side effects may include:
diarrhea;
dizziness; or
headache.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Namenda side effects (more detail)
