효과적인 비아그라 사용법
If a dosage functions very well but causes bothersome Negative effects, your doctor could advise a lower dosage. If a dosage doesn’t function that will help you get or keep an erection, your health care provider might increase your dosage.Sildenafil is primarily metabolized by hepatic CYP3A4, to your metabolite with related activity to sildenafil