Coming from a vet assistant, never stop antibiotics early. It does more harm to stop in the middle of treatment. Same goes with human antibiotics they make it clear to finish every pill on time. As for getting more you can contact your vet and they can prescribe more. Unfortunately antibiotics are not over the counter drugs so you cannot buy them online unless you have a prescription from the vet. I just had to deal with my snake having a mouth infection from a misaligned jaw and had to give her antibiotics every 3 days, even after she ate (I could have timed it better but she was fine) it's really important to not stop early just because they look better. My snake looked better after the first injection but I still gave her all 5.
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