· Cialis; Descriptions. Tadalafil is used to treat men who have erectile dysfunction (also called sexual impotence). Tadalafil belongs to a group of medicines .A small number of patients taking Cialis also reported abnormal vision. You may attempt sexual activity at any time between doses. With PAH, high blood pressure develops when a blockage in the arteries within the lung limits normal blood flow. Your doctor will probably tell you not to take tadalafil if you are taking nitrates. Also tell your doctor if you or any of your family members have or have ever had an eye disease such as retinitis pigmentosa an inherited eye condition that causes loss of vision or if you have ever had sudden severe vision loss, especially if you were told that the vision loss was caused by a blockage of blood flow to the nerves that help you see.They will review your symptoms and medical history to evaluate the best treatment option for you. Brand-name Cialis. $20 for a single 5-mg oral tablet; $80 for a single or mg oral. Tadalafil (Cialis) is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). Tadalafil works by helping to relax the blood vessels in the penis, allowing blood to flow into the penis, and causing an erection. Dosage range: mg to 5 mg. Frequency: once daily, regardless of the timing of sexual activity. Cialis’s recommended dosage when it’s taken as needed for ED is as follows. Dosage range: 5 mg to 20 mg. Frequency: one dose at least 30 minutes before sexual activity, with a maximum of one dose per day*.CIALIS can cause your blood pressure to drop suddenly to an unsafe level if it is taken with any nitrate medication. If you are already taking medication to treat BPH, your doctor may tell you to stop taking your other medication at least one day before starting treatment with tadalafil. Tadalafil is in a class of medications called phosphodiesterase PDE inhibitors. Patients who have a condition called “left ventricular outlet obstruction” from valvular problems or heart muscle enlargement may get side effects such as fainting or light-headedness. If you are thinking about using tadalafil please discuss it with your doctor. If you become pregnant while taking tadalafil, call your doctor. Tadalafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension to improve your ability to exercise.