I began taking amoxicillin last week for Lyme disease. I have had an upset stomach but still eat the same diet and I've lost about 3 pounds. I am assuming the antibiotic has something to do with it. I have been unsuccessfully battling candida for years with no success despite taking probiotics, diflucan, nystatin, garlic and many other anti-yeast supplements. Nothing works and I've had a pesky extra 10 pounds on me despite a clean, mostly vegetable diet. The drop on weight after a week of amoxicillin has me curious if a body can have too much of both good and bad bacteria and if killing it off can be beneficial to those with an already messy digestive system.