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My name is ***** ***** I have been a Vet tech for 30+ years with interest in small animals and exotics. I cannot suggest any medication or dosage to use, since it would be illegal. You need to have a hands on relationship with the squirrel and the Veterinarian.
Antibiotics should never be given unless prescribed by a Licensed Veterinarian. Squirrels fall into the Rodent family. They cannot take all antibiotics and some are harder on them than others. Procaine Penicillin and Streptomycin are are definitely two that cannot be given to a Squirrel. Other medication should be determined by a Veterinarian. If you have a Veterinarian you can show them this Chart to assist you and this is by the Irish Veterinary Wildlife Vets: http://www.irishwildlifematters.ie/animals/squirrel-drugs.html
In the mean time you need to push fluids and need to mex some Cranberry Juice unsweetened with water to dilute it and feed that. The Vitamin C in the Cranberry Juice make the urinary tract inhospitable to bacteria and will help, until you can have the squirrel seen hands on by the Vet.
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