He had MRI of lumbar last summer & surgery to grind off a calcification protrusion. It was causing a foot numbness sensation so that is gone now.
drats, did more searching and found this about creatine... dad takes both NSAIDS & acid reducer..
[You should also not mix creatine supplements with NSAIDs, diuretics, anti-acid medicines]
http://www.creatinesite.com/