There are two different ways to take tadalafil, either daily or on an as needed basis. You can report an adverse event either online, by regular mail or by fax, using the contact information at the bottom of this page. 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. Check the healthdirect’s medicines section for more information about tadalafil. Patients should seek prompt medical attention if their erection lasts longer than four hours. If you are taking tadalafil to treat PAH or BPH, follow your doctor’s directions and the guidelines in this paragraph. In trials of the drug, individuals taking Cialis saw a significant reduction in the frequency and urgency of urination and improved urine flow. · But on average, its effects start to lessen 2 to 3 hours after you take a dose. The typical dose for once-daily Cialis for ED is milligrams (mg) to 5 mg. When used as needed for ED, the usual. Contact us for answers to your medical questions. CIALIS is approved to treat erectile dysfunction (ED), the signs and symptoms of benign prostatic hyperplasia (BPH), and . Here’s our process. How we vet brands and products Cialis is a medication approved by the Food and Drug Administration (FDA) often used to treat erectile .