Coated cysteamine hydrochloride and preparation method thereof

The invention relates to a coated cysteamine hydrochloride in the technical field of the coating of the cysteamine hydrochloride. The coated cysteamine hydrochloride comprises the following components in parts by weight: 29-35 parts of cysteamine hydrochloride, 13-17 parts of stearic acid, 12-14 parts of cellulose aqueous solution with methylcellulose content of 5 wt%, 4.5-5.5 parts of citric acid and 32-38 parts of white carbon black. The preparation method comprises the following steps of: weighing raw materials; adding the stearic acid, the cellulose aqueous solution, the cysteamine hydrochloride and the citric acid to a colloid mill in sequence to be ground into milk-white liquid; adding the liquid to the white carbon black in a stirring state so as to obtain white bulk granular powder; and screening the powder by using a screen of 0.3 mm. The coated cysteamine hydrochloride and the preparation method thereof, provided by the invention, have the advantages of simple process, cheap raw material, low production cost, high finished product rate and no generation of substances like waste gas, wastes and the like; therefore, no environment pollution is caused, the stability problem of the cysteamine hydrochloride is solved, and no great irritation can be caused to the stomach while the coated cysteamine hydrochloride is taken for a long time.