Two medicines, side by side
Captopril vs losartan
Captopril and losartan are both labeled for high blood pressure and chronic kidney disease. Drugs@FDA records approvals of captopril since 1981 and of losartan since 1995. Pharmacies paid $0.228 per captopril 12.5 mg tablet and $0.0327 per losartan potassium 50 mg tablet (NADAC, October 7, 2026); the strengths differ, so the two prices are not like for like. In FDA's classes, captopril is an angiotensin converting enzyme inhibitor and losartan an angiotensin 2 receptor blocker.
Check it at the source: the captopril FDA label on DailyMed (effective February 6, 2026); the losartan FDA label on DailyMed (effective January 20, 2026).
Highlights of the captopril record
Captopril (Capoten) · label of February 6, 2026
FETAL TOXICITY When pregnancy is detected, discontinue captopril tablets as soon as possible. Drugs that act directly on the renin-angiotensin system can cause injury and death to the developing fetus. See WARNINGS: Fetal Toxicity
Used for
From the label: indicationsHypertension Captopril tablets are indicated for the treatment of hypertension. In using captopril tablets, consideration should be given to the risk of neutropenia/agranulocytosis (see WARNINGS ). Captopril tablets may be used as initial therapy for patients with normal renal function, in whom the risk is relatively low. […]
On the market
- Earliest approval on file
- April 6, 1981
- Generic labelers
- 13 labelers
- Pharmacy cost
- $0.228 per tablet
Supply and safety
- Shortage
- No current entry
- Recalls
- 5
Highlights of the losartan record
Losartan (Cozaar) · label of January 20, 2026
FETAL TOXICITY When pregnancy is detected, discontinue COZAAR as soon as possible. Drugs that act directly on the renin-angiotensin system can cause injury and death to the developing fetus [see Warnings and Precautions (5.1) ]. WARNING: FETAL TOXICITY See full prescribing information for complete boxed warning. When pregnancy is detected, discontinue COZAAR as soon as possible. Drugs that act directly on the renin-angiotensin system can cause injury and death to the developing fetus.
Used for
From the label: indicationsCOZAAR is an angiotensin II receptor blocker (ARB) indicated for: Treatment of hypertension, to lower blood pressure in adults and children greater than 6 years old. Lowering blood pressure reduces the risk of fatal and nonfatal cardiovascular events, primarily strokes and myocardial infarctions. ( 1.1 ) Reduction of the risk of stroke in patients with hypertension and left ventricular hypertrophy. […]
On the market
- Earliest approval on file
- April 14, 1995
- Generic labelers
- 43 labelers
- Pharmacy cost
- $0.0327 per tablet
Supply and safety
- Shortage
- No current entry
- Recalls
- 77
Source: FDA drug labels via openFDA (Captopril label of February 6, 2026, Losartan label of January 20, 2026); NDC Directory, Drugs@FDA, NADAC, FDA shortages and recalls (October 8, 2026)
How do captopril and losartan differ on the record?
In FDA's classes, captopril is an angiotensin converting enzyme inhibitor and losartan an angiotensin 2 receptor blocker.
Half-life, in each label's words: Captopril, “The apparent elimination half-life for total radioactivity in blood is probably less than 3 hours.”; Losartan, “The terminal half-life of losartan is about 2 hours and of the metabolite is about 6-9 hours.”
Both labels carry a boxed warning; the records quote them.
Generics: captopril since 1995; losartan since 2010 (Drugs@FDA).
| Captopril | Losartan | |
|---|---|---|
| Labeled for | High blood pressure, Heart failure, Chronic kidney disease | High blood pressure, Chronic kidney disease, Stroke prevention |
| Pharmacologic class | Angiotensin Converting Enzyme Inhibitor | Angiotensin 2 Receptor Blocker |
| How it works (label) | n/a | Angiotensin II [formed from angiotensin I in a reaction catalyzed by angiotensin converting enzyme (ACE, kininase II)] is a potent vasoconstrictor, the primary vasoactive hormone of the renin-angiotensin system, and an important component … |
| Half-life (label) | The apparent elimination half-life for total radioactivity in blood is probably less than 3 hours. | The terminal half-life of losartan is about 2 hours and of the metabolite is about 6-9 hours. |
| Earliest approval on file (Drugs@FDA) | April 6, 1981 | April 14, 1995 |
| First generic approved | March 31, 1995 | April 6, 2010 |
| Generic labelers (NDC) | 13 labelers | 43 labelers |
| Pharmacy cost (NADAC, each one's most listed form; strengths differ) | $0.228 per tablet (Captopril 12.5 mg tablet) | $0.0327 per tablet (Losartan potassium 50 mg tablet) |
| 12-month price change | -28% | +2% |
| Boxed warning | Yes | Yes |
| Shortage now | No current entry | No current entry |
| Recalls recorded | 5 | 77 |
| FAERS reports (a report is not proof of cause; counts follow how widely a medicine is used) | 9,557 | 200,566 |
| DEA schedule | none | none |
Source: Drugs@FDA, FDA NDC Directory, CMS NADAC of October 7, 2026, FDA shortages and recalls, FAERS via openFDA (FDA files October 8, 2026)
What next?
- Alternatives to captopril
- every medicine labeled for the same conditions