My wife is the same. She calls a few days before the script is up to see if they can fill it. If not then she calls around neighboring pharmacies to see if they have it available and if they do has to contact her med manager to get it transferred. It’s a huge PITA but she’s only missed a day or two thanks to keeping on top of it. It seems like the different chains and grocery stores are on different delivery schedules so someone usually has just gotten some in.