Allegra vs Viagra: side-by-side comparison
Allegra (Allergy and Antihistamines) and Viagra (Erectile Dysfunction (ED)) belong to different therapeutic classes and are rarely interchangeable. This page compares the medications' purposes, mechanisms and the situations where each is used.
| Property | Allegra | Viagra |
|---|---|---|
| Active ingredient | Fexofenadine | Sildenafil Citrate |
| Manufacturer | Sanofi | Pfizer |
| Class | Allergy and Antihistamines | Erectile Dysfunction (ED) |
| Strengths | 30mg, 60mg, 120mg, 180mg | 25mg, 50mg, 100mg |
| Forms | tablet, oral suspension, orodispersible tablet | tablet |
What's the same
Allegra and Viagra 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
Allegra belongs to Allergy and Antihistamines while Viagra belongs to Erectile Dysfunction (ED). 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
Allegra: Fexofenadine selectively blocks peripheral H1 histamine receptors, antagonising the effects of histamine on vasodilation, capillary permeability, sensory nerve endings and smooth muscle. Viagra: During sexual stimulation, nitric oxide is released in the corpus cavernosum and activates an enzyme that produces cyclic GMP.
When Allegra is preferred
Allegra is approved in adults and children for the treatment of seasonal allergic rhinitis and chronic idiopathic urticaria.
When Viagra is preferred
The medication is indicated in adult men for the treatment of erectile dysfunction, defined as the inability to achieve or maintain a penile erection sufficient for sexual activity.
Frequently asked questions
Is Allegra or Viagra better? ▾
Allegra and Viagra 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 Allegra to Viagra? ▾
Switching between Allegra and Viagra 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 Allegra and Viagra 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 Allegra comparisons
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.