Tadalafil, or generic Cialis, is most commonly used to treat erectile dysfunction (ED). However, it’s also used to treat benign prostatic hyperplasia (BPH) and pulmonary .Counseling patients about the protective measures necessary to guard against sexually transmitted diseases, including Human Immunodeficiency Virus HIV should be considered. Follow your doctor’s directions carefully, and ask your doctor or pharmacist to explain any part you do not understand. Keep from freezing. The mechanism of action for ED pills is simple: They inhibit the PDE5 enzyme which regulates the signals responsible for the smooth muscle tissue. Erectile dysfunction is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection. Your primary care doctor should always know what medications you’re taking, including ED pills prescribed by another provider.Cialis (tadalafil): This ED medication works with the same principle as Viagra, but lasts up to 36 hours. It’s available in mg, 5 mg, 10 mg, and 20 mg tablets. Cialis Daily (tadalafil): This low-dose Cialis works by increasing blood flow to the penis over time, making it easier to have an erection when aroused. You take one or 5 mg.  · The maximum dose of Cialis that can be taken in a day is 20 mg. You should not take Cialis more than once a day. In clinical trials, Cialis helped people with ED symptoms for up to Tadalafil, or generic Cialis, is most commonly used to treat erectile dysfunction (ED). However, it’s also used to treat benign prostatic hyperplasia (BPH) and pulmonary .Tadalafil is also sometimes taken once a day every day without regard to timing of sexual activity. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and site usage information with other information we have about you. 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. Erectile dysfunction is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection. However, it stays in your body for up to 36 hours and can be taken every 24 hours, so it can work for you constantly.