Who should avoid taking Levitra?
Levitra should not be taken if you are taking nitrates or nitric oxide donors (these medications are used to treat angina or chest pain). It is also contraindicated in men whom sex is inadvisable and men older than 75 years old who concomitantly use potent CYP 3A4 inhibitors (such as ritonavir, indinavir, ketoconazole and itraconazole). The safety of Levitra has not been studied in these subgroups and should not take Levitra until further studies are available: severe hepatic (liver system) impairment , endstage renal disease requiring dialysis, hypotension, recent history of stroke or heart attack, unstable angina, and known hereditary retinal degenerative disorders.
