Went for a 4.5 mile hike today, with no ill effects. There wasn't much climbing (just a few rollers), but I think I will be fine. My temperature was below normal this morning, yay.
The only thing I am worried about now, is that you have to be super careful in the sun when taking sulfa drugs. I always use sunblock, but I will be using a lot tomorrow, as it's going ot be sunny and 82 degrees. A lot of the ride is shady, thankfully.