- Viagra (Sildenafil)
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- About.com: Viagra Side Effects
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- Comprehensive Viagra side effects information for consumers and healthcare professionals.
- eMedicineHealth: Nonsurgical Treatment of Erectile Dysfunction
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- FamilyDoctor.org: Sildenafil (Viagra)
- Basic facts on the erectile dysfunction medicine Sildenafil (brand name Viagra), including its potential side effects and interactions with other medications.
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- MayoClinic: Erectile Dysfunction: Viagra and Other Oral Medications
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- Brief profile of prescription drug Viagra and its use in the treatment of erectile dysfunction. Covers common questions about getting a prescription, side effects, and safety information.
- Mother Jones: Provocative Prescriptions
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- Viagra Side Effects
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- Web Viagra
- Online resource and information regarding buying Viagra online.
- Wikipedia: Sildenafil (Viagra)
- User-edited article about sildenafil, the drug sold under the name of Viagra, used to treat male erectile dysfunction and pulmonary arterial hypertension.
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