When the drug penicillin finds the bacteria, penicillin blocks the bacteria's ability to produce this chemical, making it impossible for the bacteria to perform respiration. Numerous other drugs have been derived from penicillin and are referred to as sulfa drugs.

When the goal is to prevent certain bodily functions and reactions from taking place, the drugs used are called hormones. The most commonly used hormones are for birth control. There are two chemical components to birth control hormones. The first chemical synthesizes the natural hormone known as estrogen. When high levels of this hormone are introduced into the body, the body reads the hormone and assumes it is pregnant. The result is that the body does not allow implantation. The second chemical used to copy natural hormones is progesterone. Progesterone within the body triggers ovulation. When mimicked using chemicals, the body does not ovulate (Lide, 70). When these two artificial...
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