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If you experience headache, insomnia, nausea, diarrhea, or constipation. Check with your doctor before you stop taking Norvasc and contact your doctor. The usual starting dose is 5 milligrams taken once a day. Norvasc is prescribed for angina, a condition characterized by episodes of crushing chest pain that usually results from a lack of oxygen in the heart muscle due to clogged arteries. Side effects from Norvasc. Norvasc is used for the treatment and prevention of angina resulting from coronary artery spasm.