Get emergency medical help if you have signs of an allergic reaction to Imdur: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
a light-headed feeling, like you might pass out;
worsening angina pain;
fast or slow heart rate; or
pounding heartbeats or fluttering in your chest.
Imdur can cause severe headaches. These headaches may gradually become less severe as you continue to use nitroglycerin. Do not stop taking this medicine to avoid headaches. Ask your doctor before using any headache pain medication.
Common Imdur side effects may include:
headache; or
flushing (warmth, redness, or tingly feeling).
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.
 Imdur side effects (more detail)
