During 3 to 6 months of double-blind treatment or longer-term 1 year , open-label studies, few patients withdrew from active treatment for any reason, including lack of effectiveness. If you prefer, you may contact the U. This medicine has been approved in the United States to treat premenopausal females who have low sexual desire. What alternatives can I use for erectile dysfunction? Population pharmacokinetic data from patients in clinical trials also indicated a reduction in sildenafil clearance when it was co-administered with CYP3A4 inhibitors such as ketoconazole, erythromycin, or cimetidine [see Dosage and Administration 2. This can happen if you are sick with fever, diarrhea, or vomiting; sweat a lot; or do not drink enough liquids. If you are taking sildenafil for erectile dysfunction, you are unlikely to miss a dose since this medication is taken as needed, not on a regular dosing schedule.Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the . AdWe Offer an Extensive Selection Of Everything Else Store At Amazon. Order Today! Get Deals and Low Prices On pharmacy prescriptions At has been visited by 1M+ users in the past monthServices: Pet Supplies, Pharmacy, Medical Care, Anxiety, Hypothyroidism and more. Who may not be able to take sildenafil. Sildenafil is not suitable for some people. To make sure it’s safe for you, speak to your doctor or pharmacist before taking sildenafil if you: have ever had an allergic reaction to sildenafil or any other medicine. have recently had a stroke, heart attack or a heart problem – your doctor should.