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

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

  3. Viagra (Sildenafil Citrate): Side Effects, Uses, Dosage ... - RxList

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

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

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

  7. Sildenafil: Viagra for Erectile Dysfunction - Cleveland Clinic

  8. Viagra and dosage: Forms, strengths, how to take, and more

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

  10. Sildenafil: MedlinePlus Drug Information

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