Synthroid vs Lunesta: side-by-side comparison
Synthroid (Hormones et contraception) and Lunesta (Somnifères et hypnotiques) belong to different therapeutic classes and are rarely interchangeable. This page compares the medications' purposes, mechanisms and the situations where each is used.
| Property | Synthroid | Lunesta |
|---|---|---|
| Active ingredient | Levothyroxine | Eszopiclone |
| Manufacturer | AbbVie | Sunovion |
| Class | Hormones et contraception | Somnifères et hypnotiques |
| Strengths | 25mcg, 50mcg, 75mcg, 100mcg, 150mcg | 1mg, 2mg, 3mg |
| Forms | tablet | tablet |
What's the same
Synthroid and Lunesta 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
Synthroid belongs to Hormones et contraception while Lunesta belongs to Somnifères et hypnotiques. 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
Synthroid: La lévothyroxine remplace la thyroxine endogène déficitaire, convertie dans les tissus en hormone active, la triiodothyronine (T3), par les enzymes désiodases. Lunesta: L'eszopiclone est un modulateur allostérique positif du récepteur GABA-A, sur un site proche du site de liaison des benzodiazépines.
When Synthroid is preferred
Synthroid est autorisé dans l'hypothyroïdie de toute cause (thyroïdite de Hashimoto, post-thyroïdectomie, post-iode radioactif, congénitale), dans le goitre et dans la freination de la TSH après cancer thyroïdien différencié.
When Lunesta is preferred
Lunesta est autorisé chez l'adulte dans le traitement de l'insomnie, incluant les difficultés d'endormissement et de maintien du sommeil.
Questions fréquentes
Is Synthroid or Lunesta better? ▾
Synthroid and Lunesta 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 Synthroid to Lunesta? ▾
Switching between Synthroid and Lunesta 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 Synthroid and Lunesta 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 Synthroid 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.