Why is caverject (alprostadil) 40mcg not presented as a dual chamber injection? why is it necessary for the 20mcg caverject (alprostadil) to be kept in the fridge and not the 40

May be the same...: They may have the same storage recommendations, according to various websites. Ask the pharmacist to double check. A website for the 40mcg dose says: 24 months storage under refrigerated conditions (2-8°c). After dispensing, 3 months at room temperature (do not store above 25°c), included in 24 months shelf life. After reconstitution, the product may be stored for 6 hours below 25°c.