Xalatan vs Allegra: side-by-side comparison
Xalatan (Eye Care and Ophthalmic Treatments) and Allegra (Allergy and Antihistamines) belong to different therapeutic classes and are rarely interchangeable. This page compares the medications' purposes, mechanisms and the situations where each is used.
| Property | Xalatan | Allegra |
|---|---|---|
| Active ingredient | Latanoprost | Fexofenadine |
| Manufacturer | Pfizer | Sanofi |
| Class | Eye Care and Ophthalmic Treatments | Allergy and Antihistamines |
| Strengths | 0.005% | 30mg, 60mg, 120mg, 180mg |
| Forms | ophthalmic solution | tablet, oral suspension, orodispersible tablet |
What's the same
Xalatan and Allegra 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
Xalatan belongs to Eye Care and Ophthalmic Treatments while Allegra belongs to Allergy and Antihistamines. 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
Xalatan: Latanoprost is a prodrug ester hydrolysed by corneal esterases to its active free acid, which selectively binds the prostaglandin F (FP) receptor. Allegra: Fexofenadine selectively blocks peripheral H1 histamine receptors, antagonising the effects of histamine on vasodilation, capillary permeability, sensory nerve endings and smooth muscle.
When Xalatan is preferred
Xalatan is approved in adults and children for the reduction of elevated intraocular pressure in patients with chronic open-angle glaucoma or ocular hypertension.
When Allegra is preferred
Allegra is approved in adults and children for the treatment of seasonal allergic rhinitis and chronic idiopathic urticaria.
Frequently asked questions
Is Xalatan or Allegra better? ▾
Xalatan and Allegra 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 Xalatan to Allegra? ▾
Switching between Xalatan and Allegra 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 Xalatan and Allegra 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 Xalatan comparisons
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.