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The concomitant administration of the protease inhibitor ritonavir substantially increases serum concentrations of sildenafil (11-fold increase in AUC). If Viagra is prescribed to patients taking ritonavir, caution should be used. Data from subjects exposed to high systemic levels of sildenafil are limited. Decreased blood pressure, syncope, and prolonged erection were reported in some healthy volunteers exposed to high doses of sildenafil (200ndash;800 mg). To decrease the chance of adverse reactions in patients taking ritonavir, a decrease in sildenafil dosage is recommended [ see Dosage and Administration (2. 4), Drug Interactions (7. 4), and Clinical Pharmacology (12. 3) ]. Combination with other PDE5 Inhibitors or Other Erectile Dysfunction Therapies. The safety and efficacy of combinations of Viagra with other PDE5 Inhibitors, including REVATIO or other pulmonary arterial hypertension (PAH) treatments containing sildenafil, or other treatments for erectile dysfunction have not been studied.

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Dosis superiores a 100mg no aumentan la eficacia.

2) ]. USE IN SPECIFIC POPULATIONS. Pregnancy Category B.

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