Singulair vs Viagra Professional: side-by-side comparison
Singulair (Respiratory Medications) and Viagra Professional (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 | Singulair | Viagra Professional |
|---|---|---|
| Active ingredient | Montelukast | Sildenafil Citrate |
| Manufacturer | Organon | Pfizer |
| Class | Respiratory Medications | Erectile Dysfunction (ED) |
| Strengths | 4mg, 5mg, 10mg | 100mg |
| Forms | tablet, chewable tablet, oral granules | sublingual tablet |
What's the same
Singulair and Viagra Professional 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
Singulair belongs to Respiratory Medications while Viagra Professional 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
Singulair: Montelukast selectively blocks the CysLT1 receptor, which mediates the action of leukotrienes C4, D4 and E4 — proinflammatory mediators released by mast cells and eosinophils. Viagra Professional: Sildenafil citrate inhibits PDE5, allowing the cyclic GMP produced during sexual arousal to accumulate in penile tissue, which relaxes the smooth muscle of the penile arteries and increases blood inflow.
When Singulair is preferred
Singulair is approved in adults and children for the maintenance treatment of asthma, including exercise-induced bronchospasm, and for the treatment of seasonal and perennial allergic rhinitis when conventional therapy is insufficient or not tolerated.
When Viagra Professional is preferred
Viagra Professional is intended for adult men with erectile dysfunction.
Frequently asked questions
Is Singulair or Viagra Professional better? ▾
Singulair and Viagra Professional 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 Singulair to Viagra Professional? ▾
Switching between Singulair and Viagra Professional 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 Singulair and Viagra Professional 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 Singulair comparisons
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.