Tamiflu vs Singulair: side-by-side comparison
Tamiflu (Antiviral Medications) 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 | Tamiflu | Singulair |
|---|---|---|
| Active ingredient | Oseltamivir | Montelukast |
| Manufacturer | Roche | Organon |
| Class | Antiviral Medications | Respiratory Medications |
| Strengths | 30mg, 45mg, 75mg | 4mg, 5mg, 10mg |
| Forms | capsule, oral suspension | tablet, chewable tablet, oral granules |
What's the same
Tamiflu 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
Tamiflu belongs to Antiviral Medications 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
Tamiflu: Oseltamivir is a prodrug rapidly hydrolysed by hepatic esterases to the active metabolite oseltamivir carboxylate, which selectively inhibits the neuraminidase enzyme on the surface of influenza A and B viruses. 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 Tamiflu is preferred
Tamiflu is approved in adults and children for the treatment of acute uncomplicated influenza A and B when started within 48 hours of symptom onset, and for post-exposure prophylaxis of influenza A and B in patients aged 1 year and older.
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 Tamiflu or Singulair better? ▾
Tamiflu 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 Tamiflu to Singulair? ▾
Switching between Tamiflu 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 Tamiflu 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 Tamiflu comparisons
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.