I am sorry to hear about Whiskers.
My name is Rebecca. I am a veterinarian, and will do my best to help.
Many upper respiratory infections in cats are viruses, and antibiotics will not work against viruses, only bacteria.
And, most of the bacterial infections in cats respond better to doxycycline. Cephalexin is not an antibiotic I use in cat respiratory infections.
So probably the cephalexin will not help, and could give him vomiting and diarrhea.
If I have some, how much should I give him?
If you want to try it, the dose for an average sized cat would be around 50 mg twice a day, so you would have to divide your capsules into tenths, which would be hard to to accurately.
Of the doxycycline?
Sorry, just doing some research.
The dose of doxycycline would be about 50 mg once to twice daily. Doxy is tricky in cats, because the pills can get stuck in the throat and cause a stricture of the esophagus, which is fatal. So giving it as a liquid, or making sure a pill is swallowed by chasing it with food or water is critical.
I checked a veterinary drug book, and cephalexin is not listed as a drug to use for cat respiratory infections.
It is used more for skin infections, and sometimes urinary infections.
I have used doxycycline in cats a lot ( there are diseases like plague and tularemia in my area and that is the only effective antibiotic) so it can be used safely, you just have to be careful.
Is there anything else I can answer?
I don't think so...
I will check back with you to see how he is doing.
Kindly rate my answer, but only if all your questions have been answered.
I don't have any doxy, is there anything else I can do?
If this is viral, it will just run its course.
Keep him eating, and drinking, and well hydrated. Offer broth, watered down cat food, warmed food, what ever it take to keep him eating.
Nose drops like Little Noses, and NaSal which are available over the counter, may help.
ok. I appreciate your help.
You are welcome. Most of these infections are viral, so this may help.
If not, you will have to have a visit to a veterinarian, to get the doxycycline.
Can I give him some decongestant, like benedryl? if so, how much? I have 25 mg tabs or 10 mg claritan.
I would get ripped to shreds trying to do nose drops. He has all claws and would not hesitate to use them. Would a decongestant be better than antihistimine? Is so what kind and what dosage?