Litholyme is a new carbon dioxide absorbent for medical use that eliminates the common concerns with traditional soda lime based products in that it eliminates the potential for production of compound A, carbon monoxide, and excessive heat. Its patented formula does not contain any NaOH or KOH, and features a permanent color change that will not revert over time. Suitable for low flow applications, Litholyme is minimally exothermic, and its patented formula does not interact with sevoflurane or other commonly used inhalation anesthetic agents, even under fully desiccated conditions. Litholyme features an off -white to violet color change that is permanent and profound, indicating both exhaustion and/or desiccation and eliminating the possibility for inadvertent use of expended product.