The dosage of Tadalafil may need to be reduced in men with liver or kidney problems and risk of interactions may be higher than with Sildenafil. Avoid or Use Alternate Drug.

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Viagra Side Effects. You should continue to take your medication as prescribed, but it may help to take them at a different time of day from Viagra to help with effectiveness.

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In some patients, the use of Viagra with alpha-blockers can lead to a drop in blood pressure or to fainting Medicines called HIV protease inhibitors, such as ritonavir Norvir , indinavir sulfate Crixivan , saquinavir Fortovase or Invirase , or atazanavir sulfate Reyataz Oral antifungal medicines, such as ketoconazole Nizoral and itraconazole Sporanox Antibiotics, such as clarithromycin Biaxin , telithromycin Ketek , or erythromycin Other medicines that treat high blood pressure Other medicines or treatments for ED Viagra contains sildenafil, which is the same medicine found in another drug called REVATIO. See Dosage and Administration 2.

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