furosemide vs tamsulosin
Side-by-side comparison of furosemide and tamsulosin. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
major Known Drug Interaction
7.7 Furosemide Tamsulosin hydrochloride capsules had no effect on the pharmacodynamics (excretion of electrolytes) of furosemide. While furosemide produced an 11% to 12% reduction in tamsulosin hydrochloride C max and AUC, these changes are expected to be clinically insignificant and do not require adjustment of the tamsulosin hydrochloride capsules dosage [see Clinical Pharmacology (12.3)].
Recommendation: You can take these medicines together safely without changing your dose.
Lasix
Flomax
Furosemide is a water pill (diuretic). It helps your body get rid of extra water and salt.
Tamsulosin (Flomax) helps to improve urination in men with enlarged prostate glands. It relaxes the muscles in the prostate and bladder, making it easier to urinate.
This medicine treats swelling (edema) from heart failure, liver problems, or kidney disease. It can also treat high blood pressure. Furosemide is helpful when you need a stronger diuretic.
This medicine treats the symptoms of an enlarged prostate, also known as benign prostatic hyperplasia (BPH). BPH can cause problems with urination, like difficulty starting or stopping the flow of urine. Tamsulosin helps to relieve these symptoms.
Furosemide works in your kidneys. It helps your kidneys remove more salt and water from your blood. This lowers the amount of fluid in your body and lowers blood pressure.
Tamsulosin blocks alpha-1 adrenoceptors in the prostate and bladder. These receptors control muscle tightness. By blocking them, tamsulosin relaxes the muscles, which improves urine flow.
- • Dizziness
- • Headache
- • Blurred vision
- • Nausea
- • Vomiting
- • Headache
- • Dizziness
- • Runny nose
- • Infection
- • Abnormal ejaculation
- Difficulty breathing 29,099
- Tiredness 20,389
- Diarrhea 19,940
- Feeling sick to your stomach 18,682
- Sudden kidney damage 18,530
- Tiredness 1,417
- Shortness of breath 1,332
- Feeling lightheaded 1,131
- Loose stools 1,121
- Head pain 883
Furosemide can cause you to lose too much fluid and electrolytes. This can lead to dehydration, low blood pressure, and kidney problems. Your doctor should check your blood regularly while you are taking this medicine.
Tamsulosin can cause a sudden drop in blood pressure when you stand up, leading to dizziness or fainting. Avoid situations where you could get hurt if you faint. Tell your eye doctor if you are planning to have cataract or glaucoma surgery, as tamsulosin can cause complications during the procedure. You should be screened for prostate cancer before starting tamsulosin and regularly after.
Tell your doctor if you are pregnant or plan to become pregnant. Furosemide may not be safe during pregnancy. Talk to your doctor about the risks and benefits of taking this medicine while breastfeeding.
This medicine is only for men. It is not meant to be used by women. There is no information about the safety of tamsulosin during pregnancy or breastfeeding because it is not used in women.
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How to Read This furosemide vs tamsulosin Comparison
furosemide is classified in the Loop Diuretic drug class, while tamsulosin sits within the Alpha-1 Adrenergic Blocker class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, furosemide has 106,640 submissions while tamsulosin has 5,884. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known major interaction flagged in FDA labeling, attributed to furosemide slightly lowers the level of tamsulosin in your system, but the effect is too small to change how the medicine works.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between furosemide and tamsulosin - always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.