Diltiazem is one of the cheapest cardiac drugs in the pharmacy and one of the easiest to overpay for. The molecule is fifty years old and fully generic, but it is sold in five different release formats under at least eight names, and the price gap between the cheapest and the most expensive version of the same daily dose is more than twenty to one.
That is the whole story of this page. There is nothing to negotiate on a $2 tablet. There is a great deal to fix if your prescription landed on the wrong extended-release platform, or if your pharmacy filled the brand when a branded generic sits on the shelf at one two-hundredth of the price. Every figure below was researched on September 4, 2026.
What Does Diltiazem Cost Without Insurance?
Acquisition costs come from the CMS National Average Drug Acquisition Cost survey, effective August 19, 2026 (the 30 mg tablet row was refreshed again on September 2, 2026 at the same price). Retail cash prices come from Drugs.com and Cost Plus Drugs, both read September 4, 2026. Everything is priced per 30 tablets or capsules so the forms can be compared directly.
| Form and strength (30 units) | Low | Typical | High |
|---|---|---|---|
| Immediate-release tablet, 30 mg | $1.50 (acquisition) | $5.44 (Drugs.com) | $6.45 (Cost Plus) |
| Immediate-release tablet, 120 mg | $2.82 (acquisition) | $8.80 (Cost Plus) | $11.23 (Drugs.com) |
| 24-hour ER capsule (CD/XT), 120 mg | $4.37 (acquisition) | $8.04 (Cartia XT) | $8.04 |
| 24-hour ER capsule (CD/XT), 180 mg | $5.63 (acquisition) | $10.14 (Cartia XT) | $10.64 (Cost Plus) |
| 24-hour ER capsule (CD/XT), 240 mg | $5.91 (acquisition) | $10.31 (Cost Plus) | $12.38 (Drugs.com) |
| 24-hour ER capsule (XR), 180 mg | $10.53 (acquisition) | $16.04 (Cost Plus) | $16.04 |
| 24-hour ER tablet (LA), 180 mg | $25.29 (Cost Plus) | $28.75 (acquisition) | $36.68 (Drugs.com) |
| 24-hour ER tablet (LA), 420 mg | $55.05 (Drugs.com) | $76.25 (acquisition) | $76.25 |
| 12-hour ER capsule (SR), 120 mg | $36.02 (Cost Plus) | $59.38 (acquisition) | $59.38 |
| Brand Cardizem CD, 180 mg | $1,059.66 (Drugs.com) | $1,059.66 | $1,059.66 |
| Diltiazem IV, 5 mg/mL 25 mL vial (hospital use) | $5.65 (Drugs.com) | $5.65 | $10.02 |
Three rows in that table are inverted on purpose. On the LA tablet and the SR capsule, Cost Plus Drugs and Drugs.com both sell below the national acquisition cost that CMS surveys from retail pharmacies, which happens when a mail-order pharmacy buys better than the average corner store. Cost Plus adds a flat $5.00 shipping charge at checkout, so add that once per order.
Note the dosing frequency before you compare. The immediate-release tablet is usually taken three or four times a day, so a 30-count bottle is roughly a week. The 12-hour SR capsule is taken twice a day, so a month is 60 capsules and double the figure above. The CD, XT, XR and LA products are once daily, so 30 units is a month.
What Drives the Price
Which extended-release shell your prescription names. This is the single biggest factor and almost nobody explains it. At the 180 mg once-daily dose, CMS prices the CD/XT capsule at $0.18769 per unit and the LA tablet at $0.95818, a five-fold difference for the same milligrams of the same drug. At 120 mg, the 12-hour SR capsule is $1.97945 per capsule against $0.14557 for the 24-hour CD capsule, and because the SR is dosed twice daily a 240 mg-per-day habit costs $118.77 a month on SR capsules against $5.91 on a single CD capsule, a twenty-to-one gap.
A discontinued brand can leave an expensive orphan generic behind. Drugs@FDA lists Cardizem SR (NDA 019471) as Discontinued, along with both Cardizem injectable applications. The brand is gone but generic 12-hour SR capsules are still made, in tiny volumes, and they are priced accordingly at $1.51195 to $1.97945 per capsule. If you are on SR, that is worth a conversation about whether a once-daily capsule would work instead.
Brand versus branded generic versus generic. Brand Cardizem CD costs $841.70 for 30 of the 120 mg capsules and $1,433.78 for 30 of the 240 mg on Drugs.com. The identical generic capsule is $4.37 and $5.91 of acquisition cost respectively. Cartia XT, Taztia XT and Matzim LA look like brands but are branded generics, and CMS prices them to the penny against their unbranded twins ($0.18769 for Cartia XT 180 mg, $0.95818 for Matzim LA 180 mg). Paying extra for those names buys nothing, and paying for the real brand buys a 190-fold markup.
Strength, and the fact that bigger is usually cheaper per milligram. The 30 mg immediate-release tablet is $0.04994 and the 120 mg is $0.09394, so four times the dose costs less than twice the price. The same holds across the CD capsule ladder, where 120 mg is $0.14557 and 360 mg is $0.35317. Splitting a large tablet is not something to do on your own with an extended-release product, but it is a fair question to ask a prescriber about the immediate-release form.
Where you fill it. Diltiazem is cheap enough that dispensing fees and pharmacy margin dominate the price. A $2.82 bottle of drug sells for $8.80 at one mail pharmacy and $11.23 at average retail. That spread is small in dollars but large in percentage, and it is why checking two or three prices is worth five minutes.
Cash Price vs. Insurance
For diltiazem, paying cash usually beats running the prescription through a plan. A $6 to $16 fill is below most copay tiers, and it keeps the claim off your benefit entirely. The exception is the LA tablet and the SR capsule, where the cash price crosses into copay territory and coverage may genuinely help.
The visits are a different story. Diltiazem is prescribed for high blood pressure, angina and atrial fibrillation rate control, and all three come with follow-up appointments. CMS 2024 national claims data, released May 21, 2026, shows an average submitted charge of $276.45 for an established-patient office visit (CPT 99214) against $119.71 allowed, so the office visit costs far more than a year of the drug. Our guide to doctor visit costs without insurance covers the self-pay range for that appointment.
If your diltiazem is for rate control in atrial fibrillation, budget for periodic rhythm checks as well. See our EKG cost guide and Holter monitor cost guide for what those run as a cash payer.
How to Pay Less
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Ask which release form you are actually on, then ask if a cheaper one fits. This is the highest-value question on the page. Moving from an SR capsule or an LA tablet to a CD/XT capsule at the same daily dose can cut the drug cost by 80 to 95 percent. It is a clinical decision, not a substitution a pharmacist can make alone, so raise it at the next appointment rather than at the counter.
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Never accept the brand when a branded generic exists. Cardizem CD at $841.70 and generic diltiazem CD at $4.37 for the same 30 capsules is the widest brand-to-generic gap on this shelf. If a pharmacy hands you a brand price, ask specifically for Cartia XT, Taztia XT or the unbranded equivalent.
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Price a transparent mail pharmacy against your local counter. Cost Plus Drugs lists the 120 mg immediate-release tablet at $8.80 for 30 and the 180 mg extended-release capsule at $10.64, with a flat $5.00 shipping charge. Compare that with a discount card at your usual pharmacy; our comparison of GoodRx vs. SingleCare explains how to check more than one card on the same prescription before you commit.
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Buy 90 days at a time. Drugs.com’s own quantity tables show the per-unit price falling as the count rises: the immediate-release 30 mg tablet is $0.18 at 100 tablets and $0.12 at 500, and the LA 180 mg tablet is $1.22 at 30 and $1.00 at 90. A 90-day prescription also cuts your dispensing fees and shipping charges by two thirds.
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Use a sliding-scale clinic for the visits, not just the pills. The recurring cost of diltiazem therapy is the appointment, not the drug. A free or sliding-scale clinic can handle the blood pressure check, the refill and any lab orders on an income-based fee, which matters far more than saving three dollars on a bottle.
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Dispute anything that arrives looking like a brand charge. If a pharmacy or a hospital bills you a brand-level price for a generic calcium channel blocker, that is worth challenging in writing. Our guide to negotiating medical bills has the approach, and the negotiation script tool will draft one for a specific line item. Run any quote through the fair price checker first.
Bottom Line
Diltiazem should cost you somewhere between $6 and $16 a month as a cash payer. If you are paying more than that, the reason is almost always the release form on the label rather than the pharmacy you chose.
Check three things in order: that you are on a generic and not brand Cardizem, that you are on a 24-hour CD or XT capsule rather than an SR or LA product if that is clinically appropriate, and that you are buying 90 days at a time. If diltiazem is one of several heart medications you are filling, our metoprolol, amlodipine and propranolol cost guides cover the same ground for the other common ones, and our flecainide, sotalol and amiodarone guides cover the rhythm drugs that often sit alongside it.