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;
nitrates;
medications used to treat pulmonary artery hypertension.
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 drug interactions (more detail)
