I’ve been taking IVM (pill form) prophylactically since 2021, when it cured my case of covid (or whatever it was). I just checked my stash, and the boxes I bought back then all have a three-year expiration date. I’m sure that as long as they’re stored in a relatively cool, dry place, they’re good for even longer.
I also just checked the paste, and that has a two-year expiration date. (Why the difference, I have no idea.)
Also, 30 mg IVM seems like a sorta’ high dose ... at 0.2MG of IVM per KG of weight for prophylactic use ...that works out to you weight around 300 pounds — ??
All my stuff -- Rxs, food, water, ammo etc etc etc -- are stored in a dry, no humidity, 50° basement on 17 5-tier shelves. Firearms are in a 7ft x 6ft x 3ft Dbl-Door Cannon T65 safe, in the garage, but I'm at the limits for the 30mg caps and paste. Time to refill, probably.