Losartan (Cozaar) and Food: What You Need to Know

What to Eat on Losartan

• Low-potassium vegetables: green beans, cabbage, broccoli (moderate portions), carrots, cucumbers, corn — safe options that do not significantly raise serum potassium
• Low-potassium fruits: berries, apples, grapes, pears — safer than bananas, oranges, or avocados
• Chicken, fish, eggs: moderate potassium, safe in standard portions
• White rice, pasta, bread: low potassium, safe staples
• DASH diet foods generally: the DASH diet supports blood pressure reduction alongside Losartan — but check potassium content of individual foods if your serum K is borderline

Does Losartan Raise or Lower Potassium?

Losartan raises serum potassium — the same mechanism as ACE inhibitors like Lisinopril. ARBs block angiotensin II receptors rather than blocking the ACE enzyme, but the downstream effect on aldosterone and potassium excretion is the same. Aldosterone normally tells the kidneys to excrete potassium — with less aldosterone signaling, potassium is retained. This is a class effect of all ARBs including Valsartan, Olmesartan, and Irbesartan.

What to Avoid on Losartan

• Salt substitutes: most contain potassium chloride — dangerous on any ARB or ACE inhibitor. Never use without explicit physician approval
• High-potassium foods in large amounts: bananas, oranges, avocados, potatoes, tomato products, coconut water — limit frequency and portion size based on your serum potassium level
• Potassium supplements: never take without physician direction on Losartan
• NSAIDs: ibuprofen and naproxen reduce Losartan's blood pressure-lowering effect and compound kidney risk
• Licorice root: interferes with blood pressure control

Is Losartan the Same as Lisinopril for Food Interactions?

Yes — the dietary restrictions for Losartan and Lisinopril are essentially the same because both cause potassium retention through the same RAAS pathway. Both require limiting salt substitutes, monitoring high-potassium foods, and regular serum potassium testing. The primary clinical difference is that Lisinopril (an ACE inhibitor) causes a dry cough in approximately 10-15% of patients — those patients are typically switched to an ARB like Losartan, which does not cause this side effect. The food interaction profile transfers with the switch.

Losartan and Other Medications

Combining Losartan with spironolactone (a potassium-sparing diuretic) significantly amplifies potassium retention risk — the dietary implications become more serious on this combination. If you take both, serum potassium monitoring is essential and high-potassium food restriction is more stringent. Similarly, combining an ARB with an ACE inhibitor (dual RAAS blockade) is generally not recommended and compounds both potassium and kidney risk.