Avoid drinking alcohol. What Are the Symptoms of Erectile Dysfunction? Take Cialis just before sexual activity, but not more than once per day. Privacy: Confirm that your personal data and payment details are confidential. Some platforms have a digital pharmacy that ships the medication to your home, while others send an electronic prescription to your local pharmacy. Do not change your tadalafil dose or stop taking this medicine without your doctor’s advice. In a clinical pharmacology study, tadalafil 20 mg resulted in a mean maximal decrease in supine blood pressure, relative to placebo, of 1.Tadalafil (Cialis) is a phosphodiesterase-5 enzyme (PDE-5) inhibitor. It works by blocking PDE This is a protein in your body that breaks down the molecules that normally cause an erection. When it blocks PDE-5, tadalafil (Cialis) helps an erection occur by allowing certain muscles in the penis to relax and the penis to fill with blood. Breastfeeding Precautions For professionals Drug Images What is Cialis? Cialis is a brand-name prescription medication. It’s FDA-approved to treat the following in males:* erectile . You need a prescription to get Cialis, which you can acquire through your doctor or telehealth sources. Online ordering can be a great alternative if you prefer the convenience and discretion.