Famotidine vs Levonorgestrel: side-by-side comparison
Famotidine (H2-receptor antagonist) 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 | Famotidine | Levonorgestrel |
|---|---|---|
| Therapeutic class | H2-receptor antagonist | Synthetic progestin (emergency contraception) |
| CAS | 76824-35-6 | 797-63-7 |
| ATC | A02BA03 | G03AC03 |
| Molecular weight | 337.45 g/mol | 312.5 g/mol |
| Brands with this active ingredient | 1 | 1 |
What they share
Famotidine 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
Famotidine 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
Famotidine: La famotidine bloque de façon réversible et compétitive les récepteurs H2 de l'histamine des cellules pariétales gastriques, réduisant la sécrétion acide basale comme stimulée. 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
Famotidine: La famotidine est autorisée chez l'adulte et l'enfant dans le traitement de courte durée de l'ulcère duodénal et gastrique évolutif, dans le traitement d'entretien de l'ulcère duodénal, dans le reflux gastro-œsophagien… 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
Famotidine: La famotidine est généralement bien tolérée. 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 Famotidine better than Levonorgestrel? ▾
Famotidine and Levonorgestrel are not "better or worse" — they treat different things. The sensible question is which fits your specific need.
Can Famotidine 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 Famotidine
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.