Cialis is a prescription medication used to treat erectile dysfunction. It belongs to a class of medications called phosphodiesterase type 5 inhibitors. Cialis works by relaxes muscles and increases blood flow to certain areas of the body. Cialis is available as a tablet, and should be taken 30 minutes to an hour before sexual activity. Cialis kopen online from several reputable pharmacies. However, it is important to note that Cialis must be prescribed by a doctor, and it is not available without a prescription. In addition, Cialis should not be taken with certain other medications, so it is important to speak with a healthcare provider before starting any new medication. Cialis is a safe and effective medication for many men, and has helped millions of men around the world overcome erectile dysfunction.