Tadalafil, the generic version of Cialis, is available as an on-demand weekend pill that lasts for up to 36 hours or a low dose every day pill. Viagra is a brand-name medication, and the tablets have a distinct blue appearance and come in a recognizable box. Sildenafil is an on-demand pill that lasts for up to five hours. Read more in our editorial policy. Neither Sildenafil nor drugs in the same class are appropriate or safe for women.Sildenafil oral tablet is available as the brand-name drugs Viagra and Revatio. It’s also available as a generic drug. Generic drugs usually cost less than the brand-name g: precio.  · Sildenafil is used to treat erectile dysfunction and pulmonary arterial hypertension. Includes sildenafil side effects, interactions and g: precio.  · The cost of sildenafil without insurance starts at $* for a quantity of 30, 20mg tablets, using a RxSaver coupon. The cost of sildenafil can vary in price depending on the pharmacy your sildenafil prescription is filled at. Below is a list of pharmacies and the starting cost of a sildenafil prescription using an RxSaver g: precio.