Macrobid is an antibiotic that is prescribed for cystitis and other urinary tract infections. The active substance is nitrofurantoin, an anti-bactericidal medication that is rapidly and almost completely excreted by the kidneys.
Clarithromycin is an antibiotic (macrolide antibiotic). The product is effective with bacterial infections. It inhibits the growth of certain bacteria, because Clarithromycin slows the formation of essential proteins for these bacteria.
Oxytetracycline is a type of medicine called a tetracycline antibiotic. It is a broad-spectrum antibiotic that is active against a wide variety of bacteria. Oxytetracycline is therefore used to treat a variety of commonly-occurring bacterial infections.
Zithromax contains the active ingredient azithromycin, which is a type of medicine called a macrolide antibiotic. Azithromycin works by preventing bacteria from producing proteins that are essential to them.