Tamiflu vs Acyclovir: side-by-side comparison
Tamiflu (Oseltamivir) and Acyclovir (Acyclovir) both belong to the Antiviral Medications class. They share clinical context but use different active ingredients. The choice between them depends on mechanism nuances, side-effect profile and individual response.
| Property | Tamiflu | Acyclovir |
|---|---|---|
| Active ingredient | Oseltamivir | Acyclovir |
| Manufacturer | Roche | Various |
| Class | Antiviral Medications | Antiviral Medications |
| Strengths | 30mg, 45mg, 75mg | 200mg, 400mg, 800mg |
| Forms | capsule, oral suspension | tablet, capsule, oral suspension, topical cream |
What's the same
Tamiflu and Acyclovir both belong to the Antiviral Medications class and are used for partially overlapping indications. The active ingredients — Oseltamivir vs Acyclovir — share the same therapeutic approach, so many safety and management points carry across both.
Key differences
Meaningful differences are in active ingredient (Oseltamivir vs Acyclovir), strengths (30mg, 45mg, 75mg vs 200mg, 400mg, 800mg), forms (capsule, oral suspension vs tablet, capsule, oral suspension, topical cream), and the mechanism, half-life and side-effect nuances that distinguish members of the class.
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. Acyclovir: Acyclovir is a guanosine analogue selectively phosphorylated by viral thymidine kinase to its monophosphate form, then by cellular kinases to acyclovir triphosphate.
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 Acyclovir is preferred
Acyclovir is approved in adults and children for the treatment of herpes simplex virus infections, including genital herpes (initial and recurrent episodes), suppressive therapy of recurrent genital herpes, herpes labialis, mucocutaneous herpes simplex in immunocompromised patien…
Frequently asked questions
Is Tamiflu or Acyclovir better? ▾
There is no single answer. Tamiflu and Acyclovir both belong to the Antiviral Medications class but differ in mechanism nuances, half-life and side-effect profile. Preference depends on the patient, the prescriber and prior response to other therapies.
Can I switch from Tamiflu to Acyclovir? ▾
Switching within the Antiviral Medications class is done under supervision, typically using equivalent doses and a follow-up period to confirm response and tolerance. It is not a self-directed decision.
Do Tamiflu and Acyclovir have the same side effects? ▾
They share many of the Antiviral Medications class side effects, with differences from mechanism and dose. Each medication's prescribing information lists specifics.
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.