Obesity Additionally, certain risk factors increase the risk of ED, such as smoking , lack of exercise, and drug or alcohol use. Answer: Cialis works well for most men on the first or second attempt. I got diagnosed with severe ED and my doctor prescribed me a dose of Cialis 40 mg. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. The results showed the combination to be even more effective than either medication alone.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 prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and urgency. What Is Cialis 40 mg Drug? Cialis is the brand name of a chemical called Tadalafil used in the treatment of erectile dysfunction. Erectile dysfunction is the inability to achieve or maintain an erection long enough to perform sex. Tadalafil (Cialis) is known as a phosphodiesterase 5 (PDE5) inhibitor.  · Taking Cialis depends on why you need it. For erectile dysfunction (ED), as needed, start with 10 mg before sexual activity, and your doctor may adjust it to 20 mg or 5 mg. For daily use, take mg daily, possibly increased to 5 mg. 1. If you’re taking Cialis for benign prostatic hyperplasia (BPH), the standard dose is 5 mg taken.