theophylline ephedrine and water bio availability does anyone know if either theophylline or ephedrine or the two in combination can reduce the body s ability to make use of available water i had kind of an odd experience on a group hike recently becoming dehyrated after about hours of rigorous hiking despite having brought gallons of water c liters i drank close to twice as much as anyone else and no one else was dehydrated i don t think general physical condition was an issue since i was in at least the middle of the pack in terms of general stamina so far as i could tell it may be that i just plain need more water than most people but i am wondering if theophylline and or ephedrine might be aggravating things i took a couple of primatene tablets during the hike to control asthma mg ephedrine mg theophylline i gather that both those drugs are diuretics so now i m wondering does that mean they can reduce the body s ability to utilize available water would it be a particularly stupid thing to take that medication during hot weather exercise i always assumed diuresis just meant you urinated a lot but that wasn t the case yesterday
