Diltiazem Hcl
Brand names: Cardizem La, Cartia Xt, Diltiazem 12hr Er, Diltiazem 24hr Er, Diltiazem 24hr Er (Cd), Diltiazem 24hr Er (La), Diltiazem 24hr Er (Xr), Diltiazem Hcl, Tiadylt Er, Cardizem Cd, Dilt-Xr, Matzim La, Taztia Xt, Tiazac
At a glance
- Medicare prescriptions, 2024
- 4,046,849
- Medicare drug cost
- $121.0M
- Average cost per prescription
- $29.91
- Clinicians who prescribed it
- 98,758
Where it is prescribed
List the prescribers in any state, county, city or ZIP code →
What it is used for
Hypertension Tiazac is indicated for the treatment of hypertension. It may be used alone or in combination with other antihypertensive medications.
From the FDA-approved prescribing information (label dated August 2026). Full labels on DailyMed (opens in a new tab)
Who prescribes it
- Cardiology 22.7%
- Family Medicine 22.0%
- Internal Medicine 20.8%
- Nurse Practitioners 14.0%
- Interventional Cardiology 6.6%
- Physician Assistants 4.5%
- Cardiac Electrophysiology 4.2%
- Geriatric Medicine 1.5%
- General Practice 1.0%
- Nephrology (Kidney) 0.6%
- Hospitalist 0.5%
- Heart Failure & Transplant Cardiology 0.2%
All prescribers, by place, name or specialty →
Share of Medicare prescriptions written by each specialty. Select one to list its prescribers.
Trend, 2019–2024
Medicare prescriptions fell 13% from 2019 to 2024.
Biggest change by state since 2019
- Vermont +2%
- Utah +2%
- Delaware +2%
- Kansas −3%
- Idaho −4%
- Puerto Rico (smallest change) −27%
- Rhode Island (smallest change) −26%
From CMS’s yearly state and national Part D summaries, which count every prescriber, including those CMS leaves out of its per-clinician data (fewer than 11 prescriptions). That is why these totals are higher than the count at the top of this page. Prescriptions include refills.
What it looks like
Pills from 2 makers on file. The same medicine can look different depending on who made it, so check the imprint (the letters and numbers on the pill) with your pharmacist if a refill looks different.
Bausch Health US, LLC
| Strength | Looks like | Imprint |
|---|---|---|
| 120 mg | purple capsule, 16 mm | TIAZAC 120 |
| 180 mg | blue capsule, 18 mm | TIAZAC 180 |
| 240 mg | purple capsule, 19 mm | TIAZAC 240 |
| 300 mg | purple capsule, 22 mm | TIAZAC 300 |
| 360 mg | blue capsule, 22 mm | TIAZAC 360 |
| 420 mg | white capsule, 23 mm | TIAZAC 420 |
Direct_rx
| Strength | Looks like | Imprint |
|---|---|---|
| 300 mg | blue capsule, 23 mm | N368 300 |
Source: DailyMed (U.S. National Library of Medicine), from each maker’s FDA drug listing. A few makers are shown, not every one. Never take a pill you can’t identify; ask a pharmacist.
Industry payments about this drug
No industry payments to clinicians named this drug in 2025.
Recalls and shortages
Not on the FDA drug shortage list.
1 recall since 2020
- Jan 2023 · Sun Pharmaceutical Industries Inc · Class II
Failed Impurity (Deacetyl Diltiazem Hydrochloride) specification during stability testing and failed dissolution testing at FDA laboratory.
Recalls usually affect specific lots from one maker, not every version of a drug. Class I is the most serious; most drug recalls are Class II. FDA recalls (opens in a new tab)
Sources: CMS Medicare Part D Prescribers by Provider and Drug (2024; prescriptions include refills, and CMS hides counts under 11 per prescriber); U.S. Food and Drug Administration, openFDA (drug labels, NDC directory, enforcement reports, drug shortages); CMS Open Payments 2025; ClinicalTrials.gov. General information only, not medical advice; not yet reviewed by our medical reviewer.