Sustained release and intragastric floating riboflavin(B2HBS) tablets based on PVP and PVA. were developed.

• 以PVP、PVA为辅料的核黄素胃漂浮缓释片在体外能缓慢释药，人尿排药量试验表明该片生物利用度是普通片的1．58倍。