Among a study cohort of 160,000 children covered by private insurers, the annual cost of liquid antibiotics for those younger than 9 was approximately $2.5 million in the U.S., five times more than the U.K.'s cost of $477,000, according to a study published in the journal Pharmacotherapy. The study, based on data from children who were prescribed at least one drug in 2009, showed that antibiotics were prescribed to 75% of American children and 50% of U.K. children. Researchers also found that the antibiotics commonly prescribed in the U.S. are more expensive and taken for longer periods of time.

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