Cat sneezing

I do not know what to do for my cat. He is 8 years old, about 2 yrs.
ago he started sneezing, i thought it was alergies and maybe it is, i
took him to the vet they gave him antibiotics to clear up the respitory
infection, this happens again and again every couple months, he was
tested for fiv and was negative, he will no longer take the medicine, pills
or liguid and his condition is not good. i want to know if there is a
shot or someother way to get the medicine in him? i am at my wits end
and feel so bad for him when he has sneezing fits and snot everywhere.  I
have tried a vaporizer and anything i can think of the help him and
nothing seems to work it just gets worse.

anyone here can help ronee ?

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