Well, congrats on at least getting diagnosed.
All I can tell you is what my former neuro told me. He would not recommend anyone taking a generic version of Mestinon. Or worse, switching from the Valeant brand to a generic. Brands have to go through somewhat rigorous clinical trials but generics simply have to "copy" a formula. Just because they are all called Mestinon/Pyridostigmine Bromide, does not mean they are the same exact formula.
Also, humidity will contribute to those tablets falling apart. I use the syrup, so I don't have that problem. Don't ever put them in the fridge, though, thinking that will help. It only decreases the strength of the drug. Perhaps by putting a few in more containers, thereby lessening the amount of time the tablets are exposed to the air, might help.
I refuse to have a generic and, since I pay so much for insurance, I think I deserve to have a say in that!
Annie