Spironolactone vs Levonorgestrel: side-by-side comparison
Spironolactone (Potassium-sparing diuretic / aldosterone 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 | Spironolactone | Levonorgestrel |
|---|---|---|
| Therapeutic class | Potassium-sparing diuretic / aldosterone antagonist | Synthetic progestin (emergency contraception) |
| CAS | 52-01-7 | 797-63-7 |
| ATC | C03DA01 | G03AC03 |
| Molecular weight | 416.57 g/mol | 312.5 g/mol |
| Brands with this active ingredient | 1 | 1 |
What they share
Spironolactone 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
Spironolactone 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
Spironolactone: La spironolactone bloque de façon compétitive le récepteur minéralocorticoïde (de l'aldostérone) au niveau du tube distal du rein, réduisant la réabsorption du sodium et l'excrétion du potassium. 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
Spironolactone: La spironolactone est autorisée dans l'insuffisance cardiaque à fraction d'éjection réduite, l'hyperaldostéronisme primaire, l'hypertension résistante, les œdèmes de la cirrhose ou du syndrome néphrotique, et certains ét… 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
Spironolactone: Les effets indésirables fréquents comprennent l'hyperkaliémie (surtout en cas d'insuffisance rénale ou d'association aux inhibiteurs de l'enzyme de conversion), la gynécomastie chez l'homme, les irrégularités menstruelle… 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 Spironolactone better than Levonorgestrel? ▾
Spironolactone and Levonorgestrel are not "better or worse" — they treat different things. The sensible question is which fits your specific need.
Can Spironolactone 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 Spironolactone
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.