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    Erectile Dysfunction Drug Interactions - MedicineNet

    Fortunately, medications are available that can help increase blood flow to the penis once sexual stimulation has occurred. Sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra) may be prescribed to help with erectile dysfunction. These medications are classified as phosphodiesterase inhibitors and work by relaxing muscles in the ...

    Viagra and warfarin Interactions Checker - Drugs.com

    warfarin sildenafil. Applies to: warfarin and Viagra (sildenafil) Using warfarin together with sildenafil may cause you to bleed more easily. You may need a dose adjustment based on your prothrombin time or International Normalized Ratio (INR). Call your doctor promptly if you have any unusual bleeding or bruising, vomiting, blood in your urine ...