- Viagra (Sildenafil)
 - Information about erectile dysfunction drug Viagra, from Pfizer. Find out about how Viagra works, its common side effects, and if it's right for you. - Drugs.com: Viagra (Sildenafil)
- Provides information about Viagra including its side effects and drug interactions.
- eMedicineHealth: Nonsurgical Treatment of Erectile Dysfunction
- Provides information about Viagra, Levitra, and Cialis, the medications used to treat erectile dysfunction.
- 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.
- FDA Viagra (Sildenafil) Information
- Official information from the U.S. Food and Drug Administration about prescription drug Viagra (sildenfil citrate), approved to treat impotence, or erectile dysfunction.
- MayoClinic: Erectile Dysfunction: Viagra and Other Oral Medications
- Offers information on the oral medications of Viagra, Levitra, and Cialis, the drugs used to treat erectile dysfunction.
- MedlinePlus: Sildenafil
- 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
- A glimpse into the uncomfortable world of impotence drug names.
- RxList: Viagra
- Offers a clinical overview of how prescription drug Viagra affects nitric oxide levels in the blood as well as sections on recommended dosages and warnings.
- 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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