Medical use of hydroxypropyl β-cyclodextrin Due to the low surface activity, low hemolytic activity and non-irritation to muscles, Hydroxypropyl β-cyclodextrin is considered an ideal rmaceutical excipient and solubilizer in injections in rmaceutical industry. It works to solubilize water-insoluble drugs, enhance drug stability, improve drug bio-availability (improve efficacy or lower dosage of drugs), moderate and control drug release, and can also help to diminish the side effects of drugs. Further, Hydroxypropyl β-cyclodextrin can be applied as a drug carrier in oral medications, injections, mucosal drug delivery system, transdermal drug delivery system, and targeted lipolic drugs. Also, it is suitable as a protectant and stabilizer for proteins.