You can buy Cialis online in the United states. It is a medicine which is used for the treatment of erectile dysfunction. It is also used to treat the condition known as Pulmonary Arterial Hypertension(PAH). Erectile dysfunction is a condition in which men do not get proper erection to have a good sexual intercourse. So you can use this medicine to make your sexual activity better and enjoy it.This medicine functions to increase blood flow that's why you will get a proper erection. These are some side effects in which you should contact your doctor - dizziness, back pain, blurred vision, body pain, and headache. So do not use this medicine abnormally also take advice from your doctor before using Cialis.