Praziquantel is a medication primarily used to treat infections caused by certain types of parasitic worms, particularly schistosomes and tapeworms. It works by damaging the outer surface of the parasites, allowing the immune system to eliminate them more effectively. This drug is often administered in a single dose and is generally well-tolerated, with few side effects. It is commonly prescribed for conditions like schistosomiasis and cysticercosis, making it an important tool in combating parasitic diseases worldwide.