Get emergency medical help if you have signs of an allergic reaction to Kapvay: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
severe chest pain, shortness of breath, irregular heartbeats;
a very slow heart rate;
severe headache, pounding in your neck or ears, blurred vision;
nosebleeds;
anxiety, confusion; or
a light-headed feeling, like you might pass out.
Serious side effects may be more likely in older adults.
Common Kapvay side effects may include:
drowsiness, dizziness, headache;
feeling tired or irritable;
dry mouth, loss of appetite;
constipation;
dry eyes, contact lens discomfort; or
sleep problems (insomnia), nightmares.
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.
 Kapvay side effects (more detail)
