Herox 5mg is a medication that contains tadalafil, a phosphodiesterase type 5 (PDE5) inhibitor. It is primarily used to treat: Erectile Dysfunction (ED): Helps men achieve and maintain an erection by improving blood flow to the penis.Benign Prostatic Hyperplasia (BPH): Reduces symptoms such as difficulty in urination by relaxing the muscles in the prostate and bladder.Pulmonary Arterial Hypertension (PAH) (off-label use): May be prescribed to improve exercise ability by relaxing blood vessels in the lungs.