Olmesartan vs. Diltiazem

See how Olmesartan and Diltiazem compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Olmesartan is an ARB used only for high blood pressure, while diltiazem is a calcium channel blocker also approved for angina and certain fast heart rhythms.

  • Olmesartan is dosed once daily across just three strengths, while diltiazem for blood pressure is titrated from 120 mg up to 540 mg once daily.

  • Diltiazem generally costs less than olmesartan, but it carries more restrictions around heart rhythm problems and heart failure.

Olmesartan vs. Diltiazem Drug Summary

Olmesartan

Olmesartan is an angiotensin II receptor blocker (ARB) approved to treat high blood pressure in adults and children 6 and older. It is taken as one oral tablet daily, with doses ranging from 10 mg to 40 mg. It can be used alone or combined with other blood pressure medications.

Diltiazem

Diltiazem is a non-dihydropyridine calcium channel blocker approved for high blood pressure, angina, and certain fast heart rhythms including atrial fibrillation and PSVT. For blood pressure, it is taken as one oral tablet daily, with doses titrated from 120 mg up to 540 mg. It also comes in an IV form used in hospitals for rapid heart rate control.

Olmesartan vs. Diltiazem Side Effects

Olmesartan

Most common
dizziness (3%)
headache (>1%)
back pain (>1%)
diarrhea (>1%)

Diltiazem

Most common
edema lower-limb (6.8%)
dizziness (6.4%)
fatigue (4.8%)
bradycardia (3.6%)

Olmesartan vs. Diltiazem Dosage

Olmesartan

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 40 mg once daily Week 3 onward
Maximum dose 40 mg once daily Same as starting
Dose changes None Fixed dose

Diltiazem

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 120-240 mg once daily Weeks 1-2
Maximum dose 120-240 mg once daily Same as starting
Dose changes None Fixed dose

Olmesartan vs. Diltiazem Indications

Olmesartan

Olmesartan is approved specifically for hypertension, with no other FDA-approved uses. It can be prescribed alone or combined with other antihypertensive drugs, and is approved for children as young as 6. It is not recommended as a first blood pressure drug in patients 75 or older or with liver impairment.

  • Hypertension in adults

  • Hypertension in children 6 years and older

  • Can be combined with other antihypertensives

  • Not for initial use in patients 75+ or with liver disease

Diltiazem

Diltiazem is FDA-approved for hypertension, chronic stable angina, vasospastic angina, and rate control in atrial fibrillation, flutter, and PSVT. It is also used off-label for migraine prevention, Raynaud's phenomenon, and pulmonary hypertension. Because it covers several conditions beyond blood pressure, it is sometimes chosen when a patient has more than one of these issues.

  • Hypertension

  • Chronic stable angina

  • Vasospastic (Prinzmetal's) angina

  • Rate control in atrial fibrillation/flutter and PSVT

Olmesartan vs. Diltiazem Pros and Cons

Olmesartan

Olmesartan is a once-daily ARB with a simple three-step dose range and a favorable side effect profile for most patients. It is not typically linked to the swelling or slowed heart rate seen with calcium channel blockers, but it carries a boxed warning against use in pregnancy.

Pros

  • Simple once-daily dosing with only three dose strengths

  • Not linked to edema or slowed heart rate like calcium channel blockers

  • Approved for children as young as 6

  • Fewer heart-rhythm related contraindications

Cons

  • Boxed warning against use during pregnancy

  • Only approved to treat hypertension, no other uses

  • Carries risk of hyperkalemia and reduced kidney function

  • Roughly $115 to $205 per month without insurance, before savings programs

Diltiazem

Diltiazem's ability to treat angina and control heart rate in atrial fibrillation makes it useful beyond blood pressure alone, and it has decades of clinical use behind it. Because it slows the heart's electrical conduction, it is not appropriate for people with certain heart rhythm disorders.

Pros

  • Also treats angina and certain fast heart rhythms

  • Available in IV form for rapid in-hospital rate control

  • Long track record of use since 1982

  • Roughly $18 to $125 per month without insurance, before savings programs

Cons

  • Contraindicated in sick sinus syndrome and certain AV blocks

  • Can cause bradycardia, low blood pressure, and leg swelling

  • May worsen heart failure in people with weak heart pumping

  • Multiple formulations can make dose selection more complex

Common Symptoms and Related Diseases You Can Explore

Explore a range of common symptoms the Doctronic Symptom Checker can help you understand.