Isradipine is a calcium channel blocker that is used to treat hypertension (high blood pressure). Isradipine is sometimes used together with a diuretic or water pill.


Generic name: Isradipine

Brand names: Dynacirc, Dynacirc CR

Dosage form: oral capsule (2.5 mg; 5 mg)

Drug class: Calcium channel blocking agents


Hypertension or high blood pressure

Directions for use

  • Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

  • Your blood pressure will need to be checked often. It may take 2 to 4 weeks before your blood pressure improves.

  • Keep using this medicine as directed, even if you feel well. High blood pressure often has no symptoms. You may need to use blood pressure medicine for the rest of your life.

  • Store at room temperature away from moisture, heat, and light. Keep the bottle tightly closed when not in use.

  • Use all your blood pressure medications as directed and read all medication guides you receive. Do not change your dose or stop taking your medicine without your doctor’s advice.

What happens if I miss a dose?

Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.

What happens if I overdose?

Seek emergency medical attention.

Overdose symptoms may include fast heartbeats, severe dizziness, and warmth or tingling in your arms and legs.

Side effects

Isradipine may cause serious side effects. Call your doctor at once if you have:

  • A light-headed feeling, like you might pass out

  • Pounding heartbeats or fluttering in your chest

  • Flushing (warmth, redness, or tingly feeling)

  • Tiredness

  • Heart problems–swelling, rapid weight gain, feeling short of breath.

Common side effects of isradipine may include:

  • Flushing

  • Headache, dizziness

  • Swelling

  • Fast heartbeats

  • Upset stomach.


Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.

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