I have messed around SO MUCH with caffeine (not in a dangerous way) that it’s funny how much it affects me one day and a few weeks later my tolerance is sky-high. If I am having a lot of trouble with UTIs, I will usually cut out caffeine for a while. Eventually I end up drinking it again, and I’m like a hyperactive squirrel. Lately, it takes pretty large doses for me to even notice an effect.