I like to have:
Methylene Blue (antifungal, antiparasitic)
Kanaplex
As general medications for breeding. Both are safe for even tiny fry.
Prazipro is good for suspected internal parasites. Avoid it on fry younger than a month.
For infections in adults and juveniles, Furan-2 for bacterial, with Kanaplex as your back-up, and Coppersafe for velvet or ich. But NEVER overdose Coppersafe. You WILL kill your fish. I actually under-dose slightly.
Prime or AmQuel+ are good for ammonia spikes. Many breeders recommend dosing the tank every 24-48 hours, just in case.