List of products in the National Drug Code with proprietary name . This medication is used for long-term treatment of a certain rare genetic problem (Gaucher's disease). Eliglustat works by decreasing the amount of a certain natural fatty substance (glucosylceramide) that builds up due to this condition. This can improve symptoms of Gaucher's disease, such as bruising, tiredness, pain in the joints/bones, and a swollen liver/spleen.