Diltiazem Warnings & Precautions

Before taking Diltiazem, inform your doctor of all your medical conditions and medications. Certain conditions and patient groups require special precautions or may make Diltiazem unsuitable.

Key Warnings

→Verapamil and diltiazem: never combine with beta blockers (heart block risk)
→Grapefruit juice significantly increases blood levels of most CCBs
→Non-dihydropyridines may worsen heart failure

Pregnancy and Breastfeeding

→Nifedipine is widely used in pregnancy for hypertension and preterm labour. Other CCBs have less data. Use only under medical supervision.

Older Adults

→Ankle oedema may be more pronounced. Verapamil-induced constipation is common. Higher risk of excessive blood pressure lowering and falls.

Chronic Conditions

→Heart failure: avoid verapamil and diltiazem in systolic heart failure. Bradyarrhythmias: avoid non-dihydropyridines. Constipation: use dihydropyridines.

When Not to Use

→Cardiogenic shock
→Second or third degree heart block (non-dihydropyridines)
→Severe aortic stenosis
→Concurrent beta blocker therapy (verapamil, diltiazem)

Safety Note

Diltiazem should only be taken as prescribed. If you have any concerns about whether Diltiazem is suitable for you, consult your doctor or pharmacist.

Frequently Asked Questions

Is Diltiazem safe for everyone?

Diltiazem is not suitable for everyone. Verapamil and diltiazem: never combine with beta blockers (heart block risk) Always inform your doctor of all medical conditions before starting Diltiazem.

Why do CCBs cause ankle swelling?

Dihydropyridine CCBs dilate arteries more than veins. The resulting increased capillary pressure causes fluid to leak into tissues, particularly in dependent areas like the ankles. This is a pharmacological effect, not a sign of heart failure, though it can be uncomfortable.

More About Diltiazem

Dosage & Administration

Side Effects

Drug Interactions

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Medical Disclaimer: This drug reference is provided for informational purposes only and is not a substitute for professional medical advice. Always consult your physician or pharmacist before changing your medication. Information reviewed by the vHospital Editorial Team · Sources: WHO, BNF, FDA prescribing information.