Fish antibiotics are the same as those prescribed to people- the pills are exactly the same down to the color and numbers on them. You can get some cheap online. aquariumpharmacy.com is the one I’ve found to be cheapest, but do check around.
Good lead... fish antibiotics includes Cipro and Levoquin plus Z-pak-type and other fairly new and advanced antibiotics. ... Hollow I presume no prescription needed...?