There are no large-scale studies ofpolypharmacy (PP) in dermatology. The authors examined trends in PP (simultaneous use of > or = 4 medications in our study) and associated clinical factors among a nationally representative sample of 46,273 (weighted count +/- standard error [SE]: 617,970,596 +/- 25,187,959) dermatology-related (International Classification of Diseases, Ninth Revision, Clinical Modification codes 680-709) patient visits from 1995 to 2009. Data from the National Ambulatory Medical Care Survey and the National Hospital Ambulatory Care Survey were examined.
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