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  1. Sildenafil: Usage, Dosage & Side Effects - Drugs.com

  2. Sildenafil - Wikipedia

  3. Sildenafil (Oral Tablet): Side Effects, Dosage, Uses, and Review

  4. Sildenafil Dosage Guide + Max Dose, Adjustments - Drugs.com

  5. Sildenafil (Oral Route) Description and Brand Names - Mayo Clinic

  6. Viagra Oral Tablet: How it Works, How Long it Lasts, Cost, and More

  7. Sildenafil Tablet - Uses, Side Effects, and More - WebMD

  8. Sildenafil (Oral Route) Proper Use - Mayo Clinic

  9. Sildenafil Tablets (Erectile Dysfunction) - Drugs.com

  10. Sildenafil: MedlinePlus Drug Information