𝐂𝐢𝐚𝐥𝐢𝐬, the brand name for tadalafil, is a prescription medication primarily used to treat erectile dysfunction (ED) in men. It also has approval for the treatment of benign prostatic hyperplasia (BPH), a condition characterized by an enlarged prostate gland, and the combination of ED and BPH. 𝐂𝐢𝐚𝐥𝐢𝐬 belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to the penis during sexual stimulation. This enhanced blood flow helps men achieve and maintain an erection sufficient for sexual activity.