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

  2. Viagra: Uses, Dosage, Side Effects, Warnings - Drugs.com

  3. Sildenafil (Viagra, Revatio) - Uses, Side Effects, and More - WebMD

  4. Sildenafil - Wikipedia

  5. Sildenafil: 7 things you should know - Drugs.com

  6. Viagra: What It Is, Uses, Side Effects & Drug Interactions - HealthDay

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

  8. DailyMed - VIAGRA- sildenafil citrate tablet, film coated

  9. Patient Information - Pfizer

  10. Sildenafil: MedlinePlus Drug Information

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