What other drugs will affect Viagra? Viagra dosing information

Do not take Viagra with similar medications such as avanafil (Stendra), tadalafil (Cialis) or vardenafil (Levitra). Tell your doctor about all other medications you use for erectile dysfunction. Tell your doctor about all your current medicines and any you start or stop using, especially:

• drugs to treat high blood pressure or a prostate disorder;
• an antibiotic – clarithromycin, erythromycin, or telithromycin;
• antifungal medicine – ketoconazole or itraconazole; or
• medicine to treat HIV/AIDS – atazanavir, indinavir, ritonavir, or saquinavir.

This list is not complete. Other drugs may interact with sildenafil, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.

Viagra dosing information

Usual Adult Dose for Erectile Dysfunction: Initial dose: 50 mg orally once a day, as needed, 1 hour prior to sexual activity Maintenance: 25 to 100 mg orally once a day, as needed, 1 hour prior to sexual activity

Comments: This drug may be taken anywhere from 30 minutes to 4 hours before sexual activity.

Use: Treatment of erectile dysfunction Usual Geriatric Dose for Erectile Dysfunction: Initial dose: 25 mg orally once a day 1 hour prior to sexual activity

Viagra interactions

People with HIV that take protease inhibitors should discuss using Viagra with their doctors – protease inhibitors increase the likelihood and severity of side effects. Experts say that these individuals should have no more than 25 milligrams, and not more often than every 48 hours. If the individual is taking alpha-blockers, they should make sure they take Viagra at least 4 hours before or after to prevent dangerously low blood pressure.

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