Recognizing Cozaar-Induced Itching
Cozaar (losartan), an angiotensin II receptor blocker used for high blood pressure, can cause itching (pruritus) as a less common side effect, often linked to hypersensitivity or skin reactions. Typical symptoms include localized or widespread skin itching without initial rash, which may progress to red, raised hives (urticaria) or a measles-like rash.[1][2]
How It Starts and Progresses
Itching usually begins within days to weeks of starting the drug, starting as mild, intermittent skin irritation on the arms, legs, or torso. Patients report a burning or tingling sensation alongside the itch, worsening at night or with heat/sweat. In moderate cases, scratching leads to inflamed patches; severe reactions involve swelling (angioedema) around the face, lips, or throat.[3][4]
Related Skin Reactions
- Hives or rash: Red, itchy welts that come and go, covering larger areas.
- Eczema-like dryness: Flaky, cracked skin from persistent scratching.
- Photosensitivity: Itching intensifies with sun exposure, sometimes with blistering.
These overlap with allergic responses but differ from common dry skin.[2][5]
When to Seek Medical Help
Contact a doctor if itching persists beyond a few days, spreads rapidly, or includes difficulty breathing, swelling, or fever—these signal possible anaphylaxis. Stopping Cozaar often resolves symptoms within 48-72 hours.[1][3]
Why Does Cozaar Cause This?
The mechanism involves losartan's effect on bradykinin levels, triggering histamine release in sensitive individuals. Risk factors include prior drug allergies, liver/kidney issues, or concurrent NSAIDs.[4][6]
Differences from Other ARBs
Cozaar itching reports are similar to valsartan (Diovan) but less frequent than ACE inhibitors like lisinopril, which cause more cough-related pruritus. Switching to another ARB may help without full resolution.[2][5]
[1]: FDA Label for Cozaar
[2]: Drugs.com - Losartan Side Effects
[3]: Mayo Clinic - Losartan
[4]: MedlinePlus - Losartan
[5]: WebMD - Cozaar Side Effects
[6]: PubMed - Losartan Hypersensitivity