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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
Approximately 25% of all reported medication errors result from some kind of name confusion.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).