紫雪散是“温病三宝”之一，是救治瘟疫、高热不退、身体拘挛抽搐、预防癫痫的常备急救特效药，备受历代医家重视。宏仁堂紫雪散传统制作技艺遵循乐家老铺祖传炮制秘法，代代相传，至今已传承17代。宏仁堂紫雪散传统制作技艺从道地选材，到水飞修治、佐金煎煮、收膏下硝、自然阴干、收固闷圈，再到研兑定装，前后共历时240余天。宏仁堂紫雪散历史之悠久，工艺之繁复，周期之漫长，属国药之上品。

Zixue San is one of the three classic formulas for treating warm diseases. It has long been used as an emergency medicine for epidemic febrile diseases, persistent high fevers, muscle spasms and convulsions, as well as for preventing seizures, it should be kept on hand, and it has been highly esteemed by medical practitioners throughout history.

The traditional production technique of Hongrentang's Zixue San strictly adheres to the secret ancestral methods of the Le Family Old Shop, which has been passed down through 17 generations. The production process is a testament to patience and precision. From the selection of authentic materials to water levigation and material purification, gold-assisted decoction, extract collection with the addition of mirabilite, natural shade-drying, sealing, solidifying and mold-shaping, as well as grinding, blending, and final packaging, the entire cycle spans over 240 days.

With its long history, intricate craftsmanship, and extended production cycle, Hongrentang's Zixue San is regarded as a top-grade traditional Chinese patent medicine.