Fexofenadine vs Sildenafil Citrate: side-by-side comparison
Fexofenadine (Second-generation H1 antihistamine) and Sildenafil Citrate (PDE5 inhibitor) 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 | Fexofenadine | Sildenafil Citrate |
|---|---|---|
| Therapeutic class | Second-generation H1 antihistamine | PDE5 inhibitor |
| CAS | 83799-24-0 | 171599-83-0 |
| ATC | R06AX26 | G04BE03 |
| Molecular weight | 501.66 g/mol | 666.7 g/mol |
| Brands with this active ingredient | 1 | 10 |
What they share
Fexofenadine and Sildenafil Citrate 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
Fexofenadine acts by a different mechanism than Sildenafil Citrate, 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
Fexofenadine: Fexofenadine selectively blocks peripheral H1 histamine receptors, antagonising the effects of histamine on vasodilation, capillary permeability, sensory nerve endings and smooth muscle. Sildenafil Citrate: Sildenafil citrate selectively inhibits phosphodiesterase type 5 (PDE5), an enzyme that breaks down cyclic guanosine monophosphate in the corpus cavernosum.
Indications compared
Fexofenadine: Fexofenadine is approved in adults and children for the treatment of seasonal allergic rhinitis and chronic idiopathic urticaria. Sildenafil Citrate: Sildenafil citrate is approved in adult men for the treatment of erectile dysfunction.
Safety profile
Fexofenadine: Fexofenadine is very well tolerated. Sildenafil Citrate: Common adverse effects reported in clinical trials include headache, facial flushing, nasal congestion, dyspepsia and transient visual disturbances.
Frequently asked questions
Is Fexofenadine better than Sildenafil Citrate? ▾
Fexofenadine and Sildenafil Citrate are not "better or worse" — they treat different things. The sensible question is which fits your specific need.
Can Fexofenadine and Sildenafil Citrate 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 Fexofenadine
Products with Sildenafil Citrate
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.