Plan B vs Singulair: side-by-side comparison
Plan B (Hormones et contraception) and Singulair (Médicaments respiratoires) belong to different therapeutic classes and are rarely interchangeable. This page compares the medications' purposes, mechanisms and the situations where each is used.
| Property | Plan B | Singulair |
|---|---|---|
| Active ingredient | Levonorgestrel | Montelukast |
| Manufacturer | Foundation Consumer Healthcare | Organon |
| Class | Hormones et contraception | Médicaments respiratoires |
| Strengths | 1.5mg | 4mg, 5mg, 10mg |
| Forms | tablet | tablet, chewable tablet, oral granules |
What's the same
Plan B and Singulair 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
Plan B belongs to Hormones et contraception while Singulair belongs to Médicaments respiratoires. 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
Plan B: Le mécanisme principal de Plan B est le retard ou le blocage de l'ovulation lorsqu'il est pris avant le pic de LH. Singulair: Le montélukast bloque sélectivement le récepteur CysLT1, qui médie l'action des leucotriènes C4, D4 et E4 — médiateurs pro-inflammatoires libérés par les mastocytes et les éosinophiles.
When Plan B is preferred
Plan B est indiqué en contraception d'urgence après un rapport non protégé ou un échec de contraception avéré ou suspecté, chez la femme en âge de procréer.
When Singulair is preferred
Singulair est autorisé chez l'adulte et l'enfant dans le traitement de fond de l'asthme, y compris le bronchospasme d'effort, et dans le traitement de la rhinite allergique saisonnière et perannuelle lorsque les traitements conventionnels sont insuffisants ou mal tolérés.
Questions fréquentes
Is Plan B or Singulair better? ▾
Plan B and Singulair 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 Plan B to Singulair? ▾
Switching between Plan B and Singulair 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 Plan B and Singulair 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 Plan B comparisons
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.