Check the label and the package insert of each drug you intend to store for the manufacturer’s labeled storage directions. The manufacturer has done stability studies of that particular drug to assure the potency of the unopened vial meets the labeled potency at the expiration date if the drug is stored properly. The storage conditions are defined by the following terms (taken from the U.S. Pharmacopeia 31, General Notices: preservation, packaging, storage and labeling).
Freezer— A place in which the temperature is maintained thermostatically between 25° and 10°C (77° and 50°F).
Cold— Any temperature not exceeding 8°C (46°F). A refrigerator is a cold place in which the temperature is maintained thermostatically between 2° and 8°C (36° and 46°F).
Cool— Any temperature between 8° and 15°C (46° and 59°F). An article for which storage in a cool place is directed may, alternatively, be stored and distributed in a refrigerator, unless otherwise specified by the individual monograph.
Controlled Cold Temperature— This temperature is defined as the temperature maintained thermostatically between 2° and 8°C (36° and 46°F),that allows for excursions in temperature between 0° and 15°C (32° and 59°F) that may be experienced during storage, shipping, and distribution such that the allowable calculated MKT is not more than 8°C (46°F). Transient spikes up to 25°C (77°F) may be permitted if the manufacturer so instructs and provided that such spikes do not exceed 24 hours unless supported by stability data or the manufacturer instructs otherwise.
Room Temperature— The temperature prevailing in a working area.
Controlled Room Temperature— A temperature maintained thermostatically that encompasses the usual and customary working environment of 20° to 25°C (68° to 77°F); that results in a mean kinetic temperature calculated to be not more than 25°; and that allows for excursions between 15° and 30°C (59° and 86°F) that are experienced in pharmacies, hospitals, and warehouses. Provided the mean kinetic temperature remains in the allowed range, transient spikes up to 40° are permitted as long as they do not exceed 24 hours. Spikes above 40° may be permitted if the manufacturer so instructs. Articles may be labeled for storage at “controlled room temperature” or at “up to 25”, or other wording based on the same mean kinetic temperature. The mean kinetic temperature is a calculated value that may be used as an isothermal storage temperature that simulates the nonisothermal effects of storage temperature variations.
An article for which storage at Controlled Room Temperature is directed may, alternatively, be stored and distributed in a cool place, unless otherwise specified in the individual monograph or on the label.
Warm— Any temperature between 30° and 40°C (86° and 104°F).
Excessive Heat— Any temperature above 40°C (104°F).
Protection from Freezing— Where, in addition to the risk of breakage of the container, freezing subjects an article to loss of strength or potency, or to destructive alteration of its characteristics, the container label bears an appropriate instruction to protect the article from freezing.
Dry Place— The term “dry place” denotes a place that does not exceed 40% average relative humidity at Controlled Room Temperature or the equivalent water vapor pressure at other temperatures. The determination may be made by direct measurement at the place or may be based on reported climatic conditions. Determination is based on not less than 12 equally spaced measurements that encompass either a season, a year, or, where recorded data demonstrate, the storage period of the article. There may be values of up to 45% relative humidity provided that the average value is 40% relative humidity.
Storage in a container validated to protect the article from moisture vapor, including storage in bulk, is considered a dry place.
Storage under Nonspecific Conditions— Where no specific directions or limitations are provided in the Packaging and storage section of individual monographs or in the article's labeling, the conditions of storage shall include storage at controlled room temperature, protection from moisture, and, where necessary, protection from light. Articles shall be protected from moisture, freezing, and excessive heat, and, where necessary, from light during shipping and distribution.