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NO that product is for humans and NOT approved for cats.
The only thing you can do at home for a UTI, is give your cat a few drops of unsweetened cranberry juice. That will lower the PH of his urine and make his bladder inhospitable to UTI bacteria.
Sometimes it can help to immerse his bottom in warm water for a few minutes.
However, if he is blocked and cannot pass urine, that is a MEDICAL EMERGENCY!!! HIS BLADDER CAN BURST!HE MUST BE CATHETERIZED TO SAVE HIS LIFE!!
See if http://www.carecredit.com/ would finance this for you.
Please let me know how your cat is doing and if he urinates. I will be here all weekend and happy to help further.