24 hours on an antibiotic will traditionally be enough to stop the infection process. However, the more is better theory expounded is incorrect and dangerous! When prescribed an antibiotic (for you or your fuzzy) follow the doctor's instructions to the letter. Doubling the dose on your own volition has the net effect of halving the amount of time you will be taking the medicine, with the possible end result that you will not completely interrupt the growth of the malevolent organism ... some antibiotics work on the theory of disrupting bacterial growth and reproduction cycles over a period of time. You can end up not killing off the organism, thus reinfecting yourself with a strain of bacteria that could now be resistant to the original antibiotic!! There are strains of antibiotic resistant TB that have been traced to people not finishing prescriptions once they start to feel better. So not following prescription instructions is definitely playing with fire. I am not a doctor, but I'm sure any doctor would agree with my basic advice to always medicate properly. I am a New York State Emergency Medical Technician so I am familiar with basic medical practices. Hope you feel better and your fert stays healthy! Todd Collins [log in to unmask] [Posted in FML issue 2913]