Hello, You may try the antibiotic at 10mg/kg once a day. So the dose would be 45mg or 0.9mL a day. However, if the infection is a respiratory infection the antibiotic may not totally cover the infection. Monitor for a few days and if no improvement then a different antibiotic would be needed.
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Thanks for your question. Please reply if there is anymore I can answer.
I would do the amoxicillin, same dose as above but it is twice a day.
Your welcome. Good luck with the cat.