human biology - Why would taking antibiotics increase stamina and energy?

"There are antibiotics which contain carbohydrates, such as Gentamycin and Streptomycin (the aminoglycosides). These must be the antibiotics that could account for this phenomenon."

My conjecture that the carbohydrate moities contained within aminoglycosides account for the high energy is incorrect. Aminoglycosides are NEVER metabolized by the body, they are excreted out into the urine UNCHANGED. See here: http://www.ebmedicine.net/topics.php?paction=showTopicSeg&topic_id=43&seg_id=839

And even if it were possible to metabolize the carbohydrate molecules within them, the energy released would be far less than the energy consumed to break their linkages in the first place, thus placing a negative energy balance on the body, and thus, not providing the burst of energy that is apparently observed after taking antibiotics.