Ciprofloxacin for a chin kit?

I had a chin baby to the vet today for a crusty eye. She got his eye open and a lot of pus came out. I feel so bad for the little guy :( anyway, she said it was infected and said that she would prescribe an eye drop antibiotic to treat him. She warned though that chins do not tolerate most antibiotics well, and because he's just a baby it could be risky. She said though that it had to be treated, there really isn't a choice. She prescribed ciprofloxacin, 2 drops a day and wants to see him again on Monday. She also said I should clean his eye first. Is this safe to use on him? I'm very worried about him. Has anyone used it with success?