I suggest that your friend should have the cat checked for UTI - it is very commom in male cats, especially if they don't get the right food. That means they should have food only containing a very small amount of calcium, phosfor and magnesium. If they block up, it can be lethal within a few days. So please get that checked ASAP!

In my opinion, all male cats should avoid this junk food containing too much calcium, phosfor and magnesium. Get Hills S/D, buy it at your vets!

Good luck!