I've always found esha 2000 to be another good medication. If the interpet one doesn't work, see if your shop stocks esha meds.
Since the hospital tank doesn't have a cycled filter you will need to do daily water changes as the ammonia that will build up will make the fish worse. Some medications you dose every day so in this case do a water change then add the med. Some meds aren't dosed every day. With these, after the water change add enough med to replace the amount in the water you just took out. For instance, with a 5 gall tank (the size you said it was) if you do a 2 gall water change, add two fifths of the amount of med you add for a normal dose. Then on days you are supposed to dose, add the full dose after the water change.
The lower doses will be quite small. If they will be tricky to measure, get a babies' medicine dosing syringe from the chemist. I have one that measures up to 1ml in 1/100 ml stages. The babies medicine bit is important as you will be regarded with suspicion if you ask for just a syringe!
Since the hospital tank doesn't have a cycled filter you will need to do daily water changes as the ammonia that will build up will make the fish worse. Some medications you dose every day so in this case do a water change then add the med. Some meds aren't dosed every day. With these, after the water change add enough med to replace the amount in the water you just took out. For instance, with a 5 gall tank (the size you said it was) if you do a 2 gall water change, add two fifths of the amount of med you add for a normal dose. Then on days you are supposed to dose, add the full dose after the water change.
The lower doses will be quite small. If they will be tricky to measure, get a babies' medicine dosing syringe from the chemist. I have one that measures up to 1ml in 1/100 ml stages. The babies medicine bit is important as you will be regarded with suspicion if you ask for just a syringe!