Acyclovir vs Levonorgestrel: side-by-side comparison
Acyclovir (Nucleoside antiviral) and Levonorgestrel (Synthetic progestin (emergency contraception)) belong to different therapeutic classes and are rarely substitutes for each other. The comparison is useful when a single patient is weighing both options for adjacent or overlapping needs.
| Property | Acyclovir | Levonorgestrel |
|---|---|---|
| Therapeutic class | Nucleoside antiviral | Synthetic progestin (emergency contraception) |
| CAS | 59277-89-3 | 797-63-7 |
| ATC | J05AB01 | G03AC03 |
| Molecular weight | 225.21 g/mol | 312.5 g/mol |
| Brands with this active ingredient | 1 | 1 |
What they share
Acyclovir and Levonorgestrel share the common regulatory framework for prescription active ingredients, bioequivalence standards for generics, and pharmacist oversight. Beyond that, points in common are limited.
Key differences
Acyclovir acts by a different mechanism than Levonorgestrel, with indications that barely overlap. Comparing the two is useful when a clinician has mentioned both in the same context or the patient wants to understand why one was prescribed instead of the other.
Mechanisms compared
Acyclovir: L'aciclovir est un analogue de la guanosine phosphorylé sélectivement par la thymidine kinase virale en monophosphate, puis par les kinases cellulaires en aciclovir triphosphate. Levonorgestrel: En contraception d'urgence, le lévonorgestrel agit principalement en retardant ou en inhibant l'ovulation lorsqu'il est pris avant le pic de LH.
Indications compared
Acyclovir: L'aciclovir est autorisé chez l'adulte et l'enfant dans le traitement des infections à herpès simplex, dont l'herpès génital (épisodes initiaux et récurrents), le traitement suppressif de l'herpès génital récidivant, l'h… Levonorgestrel: Le lévonorgestrel est autorisé en contraception d'urgence (dose unique de 1,5 mg), en contraception orale régulière (associé à l'éthinylestradiol ou en progestatif seul), et comme principe actif des dispositifs intra-uté…
Safety profile
Acyclovir: Les effets indésirables fréquents comprennent nausées, céphalées, vertiges et éruptions cutanées. Levonorgestrel: Les effets indésirables fréquents de la contraception d'urgence comprennent nausées, céphalées, fatigue, vertiges, tension mammaire et modifications du cycle menstruel.
Questions fréquentes
Is Acyclovir better than Levonorgestrel? ▾
Acyclovir and Levonorgestrel are not "better or worse" — they treat different things. The sensible question is which fits your specific need.
Can Acyclovir and Levonorgestrel be combined? ▾
Whether they can be combined depends on the indications and the interaction profile of each. If both are in a single prescription, the prescriber has weighed it; in self-medication they should never be combined.
Do they have the same side-effect profile? ▾
No — they belong to different classes and have distinct side-effect profiles. Each has its own prescribing information.
Products with Acyclovir
Products with Levonorgestrel
Les informations publiées sur ce site sont fournies à titre documentaire et pédagogique. Elles ne remplacent pas l'avis d'un professionnel de santé qualifié.