Cystamine calcium salt is a chemical compound that is primarily used in the treatment of Huntington's disease. However, if we talk about antonyms for this particular term, there are none as antonyms refer to words that are opposite in meaning to each other. In this case, cystamine calcium salt is a specific substance, so it cannot have an antonym. However, antonyms can be found for other words related to cystamine, such as unhealthy, harmful, and dangerous. Antonyms for calcium and salt could include acidic, bitter, or sour, and sweet, respectively. It is important to note that understanding antonyms is crucial for effective communication and clear understanding of vocabulary.