? Zeniquin side effects?

Jester's been on Zeniquin for a UTI since Friday. The last couple of days, and particularly today, his appetite has been outrageous.

I feed him and half an hour or less later he's crying for more food. Today he cried almost constantly for over five hours. I'd already given him a can and a half total and still he wanted more.

Has anyone ever heard that Zeniquin causes cats to be hungry?

He's been on antibiotics in the past, but this is the first time with Zeniquin.

 

I have used Zeniguin for several of my cats and did not show any change in appetite.
Maybe Jester is now feeling better and is thus eating more. DId Jester eat less with the UTI?