Drug Interaction Between Celebrex and Losartan
Yes, you can take Celebrex at 8:00 p.m. and losartan at 7:00 p.m., but be aware that Celebrex may reduce the blood pressure-lowering effectiveness of losartan and potentially harm your kidneys, particularly if you are elderly, volume-depleted, or have existing kidney problems.
The Key Interaction
The FDA drug label for Celebrex explicitly warns that NSAIDs like celecoxib may diminish the antihypertensive effect of angiotensin II antagonists (which includes losartan) 1. This means your blood pressure may not be controlled as well when taking both medications together.
Kidney Safety Concerns
The most serious concern is kidney function deterioration. The FDA specifically states that in patients who are elderly, volume-depleted (including those on diuretic therapy), or with compromised renal function, co-administration of NSAIDs with angiotensin II antagonists may result in deterioration of renal function, including possible acute renal failure 1. This is a critical safety issue that supersedes the timing question.
What the Evidence Shows
Interestingly, one animal study found that celecoxib did not significantly affect losartan's blood pressure-lowering effect in renovascular hypertension 2. However, animal data cannot override FDA warnings based on human clinical experience.
Practical Recommendations
- Monitor your blood pressure regularly to ensure losartan remains effective
- Watch for signs of kidney problems: decreased urination, swelling in legs/ankles, unusual fatigue, or confusion
- Stay well-hydrated unless your doctor has restricted fluids
- Use the lowest effective dose of Celebrex for the shortest duration needed 1
- The one-hour timing difference between medications (7 p.m. vs 8 p.m.) is irrelevant—the interaction is pharmacodynamic (how the drugs affect your body), not related to absorption timing
High-Risk Situations
You are at higher risk for complications if you:
- Are over 65 years old
- Take diuretics (water pills)
- Have existing kidney disease
- Are dehydrated or have low blood volume
In these situations, your doctor should monitor your kidney function (blood tests) shortly after starting the combination and periodically thereafter 1.
Bottom Line
The timing of administration doesn't matter for this interaction. What matters is that you're taking both drugs together at all. While this combination can be used, it requires medical supervision with blood pressure monitoring and kidney function testing, especially in higher-risk patients.