I hope I can help you here; please understand though that online I can not state anything with 100% certainty, all I can offer is my best educated guess based upon what youve written.
And frankly, what you've written is very perplexing. Your own research is correct, flagyl is not really used for Klebsiella infections most of the time, and not for uncomplicated UTI's certainly. Flagyl is also not a medicine to prescribe just for a whim, it can have really horrid side effects of cramping and vomiting and taste changes, and if you drink alcohol with it, the reaction is truly abominable.
I am not your doctor, and I can not tell you to NOT take a medication. But I as well question this. Here is an article...written for doctors, on the "treatment" page, and you can clearly see that it does not list flagyl (or its generic name metrodiazole) as a treatment for a Klebsiella UTI: http://emedicine.medscape.com/article/219907-treatment
Here is information on Flagyl, you can see its not so benign: http://www.rxlist.com/flagyl-drug.htm
You can also see that Klebsiella is not one of the listed organisms Flagyl treats.
I really can not tell you to go against doctors advice, but I do suggest you call up your doctor and ask just why he suggests you take Flagyl. "It worked for other people" is not a good enough reason for you to be on it, given its side effects and the whole principle of antibiotic resistance in general. Maybe he has other reasons that are not immediately obvious to you or to me. But from where I sit, I can not understand it, and I suggest you ask him about it.
I hope that helped,
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