Penicillamine is a medication primarily used to treat conditions like rheumatoid arthritis, Wilson's disease, and certain types of kidney stones. It works by reducing inflammation and helping the body eliminate excess copper, which can be toxic in high amounts. This drug is a chelating agent, meaning it binds to metals in the body, facilitating their removal. While effective, penicillamine can have side effects, including skin rashes and gastrointestinal issues, so it is important for patients to be monitored by a healthcare professional during treatment.