Losartan Potassium vs. Naproxen
Compare Losartan Potassium and Naproxen: mechanism of action, indications, side effects, cost, and which may be right for you.
Drug A
Losartan Potassium
Cozaar
ARBs (Angiotensin II Receptor Blockers)
RxDrug B
Naproxen
Naproxen
NSAIDs (Non-Steroidal Anti-Inflammatory Drugs)
RxQuick Comparison
| Category | Losartan Potassium | Naproxen |
|---|---|---|
| Drug Class | ARBs (Angiotensin II Receptor Blockers) | NSAIDs (Non-Steroidal Anti-Inflammatory Drugs) |
| Rx Status | Rx | Rx |
| Generic Available | No | No |
| Typical Cost | $4–$15/month | $4–$25/month |
Losartan Potassium Overview
Losartan potassium (Cozaar) is an angiotensin II receptor blocker (ARB) used to treat high blood pressure, protect the kidneys in type 2 diabetes, and reduce the risk of stroke in patients with hypertension and left ventricular hypertrophy. Unlike ACE inhibitors, losartan does not cause a dry cough and carries a significantly lower risk of angioedema. It is also the only ARB with a clinically mean...
Full Losartan Potassium guide →Naproxen Overview
NAPROXEN (brand name: Naproxen) is a NSAIDs. 1 INDICATIONS & USAGE Naproxen delayed-release tablets are indicated for: the relief of the signs and symptoms of: rheumatoid arthritis osteoarthritis ankylosing spondylitis Polyarticular Juvenile Idiopathic Arthritis Naproxen delayed-release tablets are non-steroidal anti-inflammatory drugs…
Full Naproxen guide →How Each Drug Works
Losartan Potassium
Mechanism of Action — AT1 Receptor Blockade
Losartan is a selective, competitive antagonist of the angiotensin II type 1 (AT1) receptor. Unlike ACE inhibitors, losartan does not prevent the formation of angiotensin II — instead, it blocks angiotensin II from binding to its primary receptor.
Step-by-step mechanism:
- Renin-angiotensin-aldosterone system (RAAS) activation: Renin converts angiotensinogen to angiotensin I; ACE converts angiotensin I to angiotensin II via multiple pat…
Naproxen
Naproxen has analgesic, anti-inflammatory, and antipyretic properties. The mechanism of action of naproxen, like that of other NSAIDs, is not completely understood but involves inhibition of cyclooxygenase (COX-1 and COX-2). Naproxen is a potent inhibitor of prostaglandin synthesis in vitro. Naproxen concentrations reached during therapy have produced in vivo effects. Prostaglandins sensitize afferent nerves and potentiate the action of bradykinin in inducing pain in ani…
Approved Uses (Indications)
Losartan Potassium
FDA-Approved Indications:
Hypertension (adults and pediatric patients ≥6 years):
- Treatment of hypertension to reduce blood pressure and lower the risk of cardiovascular events
- Can be used as monotherapy or in combination with other antihypertensives
- Pediatric use: approved for children ≥6 years with eGFR >30 mL/min/1.73m²
Diabetic Nephropathy (type 2 diabetes with proteinuria and hypertension):
- Reduces the rate of progression of nephropathy as measured by doubling of serum creatinine or ESRD
- RENAAL trial: 25% reduction in doubling of serum creatinine, 28% reduction in E…
Naproxen
Naproxen delayed-release tablets are indicated for: the relief of the signs and symptoms of: rheumatoid arthritis osteoarthritis ankylosing spondylitis Polyarticular Juvenile Idiopathic Arthritis Naproxen delayed-release tablets are non-steroidal anti-inflammatory drugs indicated for: the relief of the signs and symptoms of: rheumatoid arthritis osteoarthritis ankylosing spondylitis polyarticular juvenile idiopathic arthritis
Side Effects
Losartan Potassium
Serious Side Effects
Common Side Effects
Rare Side Effects
Naproxen
Cost Comparison
Losartan Potassium
$4–$15/month
Generic losartan potassium is available at most pharmacies for $4–$15/month, and is included on most $4 generic drug programs at major pharmacy chains (Walmart, Kroger, Costco). Brand-name Cozaar is significantly more expensive (~$200–$300/month) but is rarely prescribed. Hyzaar (losartan/hydrochlorothiazide combination) is also available generically at similar low cost. GoodRx and RxGo coupons can further reduce the price at most pharmacies.
Naproxen
$4–$25/month
Naproxen is widely available as an affordable generic. Using discount cards like GoodRx can further reduce the cost, often bringing it to under $10 per month.
Drug Interaction: Moderate
Naproxen, like all NSAIDs, can reduce the antihypertensive effect of losartan and increase the risk of acute kidney injury. The mechanism and clinical significance are identical to the losartan-ibuprofen interaction. Naproxen has a longer half-life (12–17 hours) than ibuprofen, which may prolong the duration of the interaction.
Mechanism: Naproxen inhibits COX-1 and COX-2, reducing prostaglandin-mediated renal vasodilation and causing sodium/water retention. This directly opposes the antihypertensive and renal-protective effects of losartan. In patients with reduced renal reserve, the combination can precipitate acute kidney injury through the same 'triple whammy' mechanism as ibuprofen.
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Medical Disclaimer
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