Stendra vs Synthroid: side-by-side comparison
Stendra (Erectile Dysfunction (ED)) and Synthroid (Hormones and Birth Control) belong to different therapeutic classes and are rarely interchangeable. This page compares the medications' purposes, mechanisms and the situations where each is used.
| Property | Stendra | Synthroid |
|---|---|---|
| Active ingredient | Avanafil | Levothyroxine |
| Manufacturer | Metuchen Pharmaceuticals | AbbVie |
| Class | Erectile Dysfunction (ED) | Hormones and Birth Control |
| Strengths | 50mg, 100mg, 200mg | 25mcg, 50mcg, 75mcg, 100mcg, 150mcg |
| Forms | tablet | tablet |
What's the same
Stendra and Synthroid 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
Stendra belongs to Erectile Dysfunction (ED) while Synthroid belongs to Hormones and Birth Control. 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
Stendra: Avanafil selectively inhibits phosphodiesterase type 5 (PDE5) in the corpus cavernosum, increasing cGMP and enhancing nitric-oxide-mediated vasodilation in response to sexual stimulation. Synthroid: Levothyroxine replaces deficient endogenous thyroxine, which is converted in tissues to the active hormone triiodothyronine (T3) by deiodinase enzymes.
When Stendra is preferred
Stendra is approved for erectile dysfunction in adult men.
When Synthroid is preferred
Synthroid is approved for hypothyroidism of any cause (Hashimoto thyroiditis, post-thyroidectomy, post-radioiodine, congenital), goitre and TSH suppression after differentiated thyroid cancer.
Frequently asked questions
Is Stendra or Synthroid better? ▾
Stendra and Synthroid 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 Stendra to Synthroid? ▾
Switching between Stendra and Synthroid 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 Stendra and Synthroid 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 Stendra comparisons
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.