The penis is one of the areas where this enzyme works. When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the drug’s effects last and side effects. Keep out of the reach of children. Children 1 year of age and older weighing 20 kg or less—10 mg 3 times a day. Children—Use is not recommended.The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Viagra (sildenafil) is a brand-name prescription drug that’s used to treat erectile dysfunction (ED). Learn about side effects, warnings, dosage, and more. Here’s what you can do. 1. Leave her alone. This may not be easy, so try to be patient. In the first two weeks, the bristles may look “spotty”, but take our word for it-it’s worth waiting a couple more weeks, and its appearance is likely to change for the better. A beard is a naughty thing, and at first every hair has its own life.