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According to the recent tendency of polypharmacy in clinical department, the probability of the occurrence of drug interaction and adverse effect become increased. This study on the polypharmacy was accomplished for the 1760 inpatients in Chonnam National University Hospital at one day of January, April and July in 1990, in order to obtain the available informations for the monitoring of polypharmacy-related drug interaction and side effect, on the route of drug administration, injection occupied 42.5%, the combination of internal medicine and injection 34.6%, thus these two cases 77.1%. On drug dosage form, injection occupied 83.4%, internal medicine 54% and external medicine 7.6%. The case to use 4 drugs occupied the highest value of 11.2% and the case to use 1 drug occupied 8.6%. The highest number of used drug was 28 and 90% of the patients used less than 12 drugs. The average number of used drug per patient was 6.3. The average number of used drug in surgical department was 6, in internal medical department 6.5 and in otorhinolaryngological department the highest value of 7.1. The average number of used drug in infants and pediatrics was 5.2, in 21-50 year old adults 6.2 and in above 71 year old geriatrics 6.9. As age increased, the number of used drug tended to increase. So we should make a thorough investigation of polypharmacy-related drug interaction and side effect, especially to geriatrics.
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