Penicillamine is a medication commonly used to treat rheumatoid arthritis and Wilson's disease. Some synonyms for penicillamine are Depen, Cuprimine, and D-Penamine. These terms are often used interchangeably in medical circles, though they may have different brand names depending on the country or manufacturer. Other synonyms for penicillamine include D-3-Mercaptovaline, 3-Mercapto-D-valine, and β,γ-Dimethylcysteine. These terms describe the chemical composition of the drug and are used mostly in research and scientific literature. Overall, despite having multiple synonyms, penicillamine remains an important medication for treating autoimmune disorders and other illnesses.