Ask your doctor if you are not sure whether any of your medications contain nitrates. Ask your doctor about any risk. It may increase your risk of dizziness or fainting. It may not be safe to breastfeed while using this medicine. This increased blood flow can cause an erection. The onset of the medication is not slow down by meals, therefore you can take this prescription with or without food. FAQs How long does 60 mg of Cialis last?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 .  · Cialis (tadalafil) is prescribed to treat erectile dysfunction and symptoms of benign prostatic hyperplasia. It comes as a tablet that’s taken as needed or once per . Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged .