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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.
More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
In 1864, the first barbiturate (barbituric acid) was synthesized.
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