Development of a novel moisture-suppression bag for the preservation of hygroscopic medications

BACKGROUND: One-dose packaging is frequently used in Japan for elderly patients who are prescribed several medications. It is useful for easy administration and the prevention of misuse or missed medications. Hygroscopic medications are not suitable for one-dose packaging because moisture absorption may alter their properties. Plastic bags with desiccating agents are sometimes used to store hygroscopic medicines in one-dose packaging. However, the relationship between the quantity of desiccating agents and their safety in the storage of hygroscopic medications is poorly understood. Furthermore, older adults might accidentally consume desiccating agents used in food preservation. In this study, we developed a bag that suppresses the moisture absorption of hygroscopic medications without the use of desiccating agents. METHODS: The bag was manufactured using polyethylene terephthalate, polyethylene, and aluminum film on the outside, and unified with a desiccating film on the inside. RESULTS: The relative humidity (RH) in the bag was maintained at approximately 30–40% when the bag was stored at 75% RH and 35 °C. The manufactured bag’s moisture suppressing effect was better than that of plastic bags with desiccating agents when the hygroscopic medications, potassium aspartate and sodium valproate tablets, were stored at 75% RH and 35 °C for 4 weeks. CONCLUSIONS: The moisture-suppression bag effectively stored and preserved hygroscopic medications and was more effective in inhibiting moisture absorption than plastic bags with desiccating agents under high temperature and humidity conditions. The moisture-suppression bags are expected to be useful for elderly patients who are prescribed several medications in one-dose packaging.