I thought I'd better bring this up as a separate topic. If you have any questions about Mestinon, this is the place to find answers.
http://mestinon.com/
DO NOT store your Mestinon in the refrigerator!!!
Look at the "How Supplied" section of the prescribing information. The syrup, tablets and Timespan all need to be stored at 25 degrees Celcius (77 F). "Excursions permitted" to 15C - 30 C (59F - 86F). It would more than likely affect the potency or even effectiveness of the drug.
A dark closet will be a coolish place to store it but not too cool.
Please read all the labels of all of your drugs!!! I know it's not fun to do but you may be able to avoid harm to yourself in the future by a little temporary harm to your poor ptosis laden eyes now.
Oh, and if you have stored your Mestinon in the fridge, I'm not so sure you should use it!
Annie