Although the interaction betwixt other protease inhibitors and Viagra has not been studied, their accompanying expend is potential to addition sildenafil levels. Sildenafil is exculpated preponderantly by the CYP3A4 (John Roy Major route) and CYP2C9 (minor route) liverwort microsomal isoenzymes. The Major circulating metabolite results from Ndesmethylation of sildenafil, and is itself promote metabolized. This
