Consult your doctor or pharmacologist for even more details. The HIV drug ritonavir, when taken with Viagra, led to a four-fold increase in the quantity of sildenafil existing in clients' blood in clinical research studies. This necessitated an advised dosing change in clients taking Viagra while additionally being treated http://dallasb9j7c.blogrelation.com/16121015/sildenafil-tablets-impotence