How to take norethisterone to delay menstruation the main component of Viagra is Sildenafil Citrate. Sildenafil Citrate affects the response to sexual stimulation. It acts by enhancing smooth muscle relaxation using nitric oxide, a chemical that is normally released in response to sexual stimulation. This smooth muscle relaxation allows increased blood flow into certain areas of the penis, which leads to an erection. Sildenafil Citrate is applied for the treatment of erectile dysfunction (impotence) in men and pulmonary arterial hypertension. Sildenafil Citrate may also be used for other purposes not listed above. Many people using this medicine do not have serious side effects. Do not take this medication without doctor advice if you have chronic malabsorption syndrome or gallbladder problems. Do not use Orlistat if your medical history includes kidney stones, have anorexia or bulimia, have diabetes, take cyclosporine, or take any other weight-loss medicine. Weight loss begins within two weeks and continues for years. The effect of using Orlistat for more than 2 years is still unknown. If you have diabetes, weight-loss is likely to reduce your blood sugar levels. Consult to your doctor about the dosage of Orlistat if you’re taking oral diabetes medication or insulin. Orlistat should not be used during pregnancy, becoming pregnancy or lactating. Do not use before breast-feeding without doctor’s permission.