Niclosamide tablets with a dosage of 500mg are primarily used to treat certain parasitic infections in the human body. Niclosamide 500 mg is an anthelmintic medication that is effective against tapeworm infections, including Taenia solium (pork tapeworm) and Taenia saginata (beef tapeworm). These infections typically occur after the consumption of undercooked or contaminated meat. Niclosamide works by disrupting the metabolism and energy production of the tapeworm, ultimately leading to its expulsion from the body. It's important to note that niclosamide should be taken under the supervision and prescription of a healthcare professional, and the prescribed dosage and treatment duration should be followed closely to ensure the complete elimination of the parasitic infection.