Voltaren vs Lasix: side-by-side comparison
Voltaren (Pain Relief Medications) and Lasix (Diuretics) belong to different therapeutic classes and are rarely interchangeable. This page compares the medications' purposes, mechanisms and the situations where each is used.
| Property | Voltaren | Lasix |
|---|---|---|
| Active ingredient | Diclofenac | Furosemide |
| Manufacturer | Novartis | Sanofi |
| Class | Pain Relief Medications | Diuretics |
| Strengths | 25mg, 50mg, 75mg, 100mg | 20mg, 40mg, 100mg |
| Forms | tablet, delayed-release tablet, topical gel, suppository | tablet |
What's the same
Voltaren and Lasix are used in very different patients, and the points in common are limited. The main shared element is that both meet regulatory standards for efficacy and safety and benefit from pharmacist oversight.
Key differences
Voltaren belongs to Pain Relief Medications while Lasix belongs to Diuretics. Indications, mechanisms and target populations differ. The comparison is most useful when a clinician has mentioned both medications and the patient wants to understand where each fits.
Mechanism and action
Voltaren: Diclofenac reversibly inhibits cyclooxygenase enzymes COX-1 and COX-2, with somewhat greater selectivity for COX-2 than ibuprofen and naproxen. Lasix: Lasix acts in the kidney's loop of Henle, where it blocks the NKCC2 co-transporter that normally reabsorbs sodium, chloride and potassium from the urine back into the bloodstream.
When Voltaren is preferred
Voltaren is approved in adults for the treatment of osteoarthritis, rheumatoid arthritis, ankylosing spondylitis, acute musculoskeletal pain, post-surgical pain, primary dysmenorrhoea, acute migraine and ureteric colic.
When Lasix is preferred
Lasix is approved for fluid overload due to heart failure, chronic kidney disease and liver cirrhosis (with or without ascites), as well as acute pulmonary oedema.
Frequently asked questions
Is Voltaren or Lasix better? ▾
Voltaren and Lasix are not interchangeable — they treat different conditions. Asking which is "better" is meaningful only when a clinician has weighed both for the same specific clinical scenario.
Can I switch from Voltaren to Lasix? ▾
Switching between Voltaren and Lasix is rarely an appropriate decision since they belong to different classes and treat different conditions. The real question is usually whether the diagnosis calls for one medication or the other — which the prescriber resolves.
Do Voltaren and Lasix have the same side effects? ▾
No — they belong to different classes and have distinct side-effect profiles. Each medication has its own prescribing information.
More Voltaren comparisons
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.