Recommended storage is at -80 degree C. The product is stable for the period shown on the bottle label when stored as directed. Brefeldin A is a chemical which is known to be an irritant. It is irritating to eyes, respiratory system and skin. In case of contact with eyes and/or skin, wash immediately with water and seek medical attention. Wear suitable protective clothing and gloves. This material and its container must be disposed of as hazardous waste. Handle with care.