Inside Rx cannot be used with any insurance benefit, copay assistance programs, or by persons covered by state-funded or federal-funded programs such as Medicare, Medicaid, or Tricare for purchases of certain medications, even if processed outside the benefit as an uninsured cash-paying patient. Some barriers to successful sildenafil therapy in the treatment of erectile dysfunction include cost and social stigma surrounding erectile dysfunction. This similarity protects cGMP from degradation because sildenafil can bind to the catalytic site to act as a competitive inhibitor of cGMP-specific PDE-5, the enzyme that normally catalyzes the breakdown of vasodilatory cGMP. Consider starting at a dose of 25 mg in patients with hepatic dysfunction e. It is in the phosphodiesterase-5 inhibitor PDE5-I class of medications. Take sildenafil up to 4 hours before you want to have sex.The normal dose when starting Viagra is 50 mg, as needed. The maximum dose of Viagra is mg each day. Doses above the maximum dose, such as mg per day, will increase the risk of side effects. Compare prices for Sildenafil Citrate and save up to 80% using Inside Rx. Sildenafil Citrate prices starting at $ AdBrowse & discover thousands of brands. Read customer reviews & find best sellers. Find deals and low prices on sildenafil mg at test1.ru has been visited by 1M+ users in the past month.