You can get this WITHOUT a script if you go to the fish section of a pet store or online at KVvet.com It's under fish antibiotics and it comes in exactly same form as the vet prescribes for dogs, etc.
There are several meds that can be bought this way in the fish section. MUCH cheaper and many times a vet won't write a prescription for you.
While Tetracycline is one of the cheapest antibiotics you can buy at Walmart, a vet will charge you $1.00 a pill. On the website I mentioned above you can buy it w/o a script for $21.95 for 100 capsules.
The physician/veterinarian world has this country in an unbelievable choke hold.