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My advice is to call your veterinarian and ask them if you can use the antibiotics on your other kitten. Be aware, that antibiotics have to be administered for a certain amount of days as prescribed, and if there is not enough left for you to give, then it won't work properly and it could start up another infection.
Generally, with little kittens, they are so fragile and could take a turn for the worst in a very short amount of time, as they haven't built up a good immune system as an older cat would have.
Please don't take chances. Your kittens are probably both due for booster shots, so you'll want to take them in for checkups anyway. Please give us an update on how things are going for your dear little kitties. Sickness sucks!
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