Tamiflu vs Voltaren: side-by-side comparison
Tamiflu (Antiviral Medications) and Voltaren (Pain Relief 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 | Voltaren |
|---|---|---|
| Active ingredient | Oseltamivir | Diclofenac |
| Manufacturer | Roche | Novartis |
| Class | Antiviral Medications | Pain Relief Medications |
| Strengths | 30mg, 45mg, 75mg | 25mg, 50mg, 75mg, 100mg |
| Forms | capsule, oral suspension | tablet, delayed-release tablet, topical gel, suppository |
What's the same
Tamiflu and Voltaren 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 Voltaren belongs to Pain Relief 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. Voltaren: Diclofenac reversibly inhibits cyclooxygenase enzymes COX-1 and COX-2, with somewhat greater selectivity for COX-2 than ibuprofen and naproxen.
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 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.
Frequently asked questions
Is Tamiflu or Voltaren better? ▾
Tamiflu and Voltaren 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 Voltaren? ▾
Switching between Tamiflu and Voltaren 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 Voltaren 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.