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
Diltiazem
Olmesartan vs. Diltiazem Dosage
Olmesartan
Diltiazem
| 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 |
| 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
| 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
| 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
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