Cosopt: Store at temperatures not exceeding 25°C. Protect from light.
Cosopt-S: Store at temperatures not exceeding 30°C. Store in the original package in order to protect from light.
Dorzolamide HCl/Timolol Maleate (Cosopt-S) should be used no longer than 1 month after first opening the sachet. Discard any unused single dose containers after that time.