Urine infection help - what does this mean please??

[themachinehasstopped]

I am prone to urine infections since childhood, and have in the past been in constant pain for years triggered off by a UTI. Also been in hospital with it going up to my kidney once. So I need to be treated quick.

I find Nitrafurantoin is the only antibiotic that's ever worked for me, but 3 days isn't enough.

This time it hasn't helped as much. I got complacent with my usual preventative measures and started with symptoms on Christmas morning.

So I phoned my GP today and asked to put a sample in, but I have just finished Nitrafurantoin (3 days, usually I need 5-7 but it should have started to help by now). Reception said just hand one in anyway. Surely the Nitrafurantoin needs to be out of my urine first though??

I found this -

"Approx. 20-25% of the total single dose of nitrofurantoin is recovered from the urine unchanged over 24 hours"

Can anyone shed light on what this means please?

It was slow release formulation (Macrobid??) How long until it is out of my urine??

I really don't want to let this fester, but I do want to know what bug it is and what antibiotic is correct.

If the nitrofurantoin hasn’t worked they need a sample to see what bug you have and what it’s sensitive to. Makes naff all difference when you took the nitrofurantoin - they’re not measuring that.

@Greybeardy But if the Nitrafurantoin is still in my urine, then surely it could cause the sample to be skewed??

I am sure I read somewhere that Nitrafurantoin causes false negatives on MSU samples.