Sometimes, antibiotics and other medications interact, increasing or decreasing the blood levels of other medications through altering their metabolism or by a number of other processes (see table Some Common Effects of Antibiotics on Other Drugs). Antibacterial Drugs with a low therapeutic ratio are involved in the most clinically significant interactions (ie, toxic levels are close to therapeutic levels). Moreover, some medications can change the amount of antibiotics in the body.
Since many antibiotics share chemical similarities, they are classified into groups. Although having structural and functional similarities, each class of medications differs in their pharmacology and spectrum of activity.
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