Lasix vs Singulair: side-by-side comparison
Lasix (Diuretics) and Singulair (Respiratory Medications) belong to different therapeutic classes and are rarely interchangeable. This page compares the medications' purposes, mechanisms and the situations where each is used.
| Property | Lasix | Singulair |
|---|---|---|
| Active ingredient | Furosemide | Montelukast |
| Manufacturer | Sanofi | Organon |
| Class | Diuretics | Respiratory Medications |
| Strengths | 20mg, 40mg, 100mg | 4mg, 5mg, 10mg |
| Forms | tablet | tablet, chewable tablet, oral granules |
What's the same
Lasix and Singulair 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
Lasix belongs to Diuretics while Singulair belongs to Respiratory Medications. 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
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. Singulair: Montelukast selectively blocks the CysLT1 receptor, which mediates the action of leukotrienes C4, D4 and E4 — proinflammatory mediators released by mast cells and eosinophils.
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.
When Singulair is preferred
Singulair is approved in adults and children for the maintenance treatment of asthma, including exercise-induced bronchospasm, and for the treatment of seasonal and perennial allergic rhinitis when conventional therapy is insufficient or not tolerated.
Frequently asked questions
Is Lasix or Singulair better? ▾
Lasix and Singulair 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 Lasix to Singulair? ▾
Switching between Lasix and Singulair 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 Lasix and Singulair 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 Lasix comparisons
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.