You’ll soon start receiving the latest Mayo Clinic health information you requested in your inbox. This medicine is also used to treat erectile dysfunction and signs and symptoms of BPH. If you are experiencing issues with your sexual health, you can opt to take Tadalafil and experience its effects. As most Tadalafil drugs like the ones available at betterhealth. Use only the brand of this medicine that your doctor prescribed. What special precautions should I follow? From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. · Adults—5 milligrams (mg) once a day, taken at the same time each day, without regard for the timing of sexual activity. Children—Use is not recommended. For . Tadalafil is in a class of medications called phosphodiesterase (PDE) inhibitors. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. . It is the brand name for tadalafil, a medication also used to treat ED. Tadalafil is in a class of drugs called phosphodiesterase-5 (PDE5) inhibitors and is .