If you are taking tadalafil on a regular schedule, take it at around the same time every day. Therefore the use of such treatments in combination with Cialis is not recommended. Call your doctor for medical advice about side effects. Patients should seek prompt medical attention if their erection lasts longer than four hours. Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. If you are taking tadalafil to treat PAH or BPH, follow your doctor’s directions and the guidelines in this paragraph. The medication will be effective for up to 36 hours.Can I Take 40 mg of Tadalafil (Cialis) for ED? Medically reviewed by Joseph Brito III, MD Here’s what to know about taking 40 mg of Cialis, why it could be bad for you, and other options you have. Experience the convenience of ordering Cialis online. Dive into the world of quick, safe, and easy online purchasing with our comprehensive guide, busting myths and highlighting the benefits. Cialis Super Active is a generic drug, against erectile dysfunction, containing 20 mg of tadalafil. The tablets in this series have a gel inside. Cialis is a medication approved by the Food and Drug Administration (FDA) often used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH) in those assigned male at birth.