The use of Metered Dose Inhaler (MDI) preparations is a therapeutic option for maintenance in

asthma patients. The purpose of this study was to study the effect of counseling on the use of MDI preparations in asthma patients at the outpatient pharmacy Departmentof of Dr. M. Djamil Tertiary Referral Hospital. Data was collected from 40 respondents with a purposive sampling method using a questionnaire containing 8 questions on the correct use of MDI. Data collection from respondents was obtained through three stages, in the first stage the respondent was asked to fill out a questionnaire, in the second stage the researcher provided correct information through counseling while directly demonstrating the use of the inhaler, and in the third stage, the patient was asked to return to fill out the same questionnaire after completion of counseling which would be assessed by the researcher. The results show an increase in scores from before counseling, namely 6.1 out of a scale of 8, and after counseling, namely 7.9 out of a scale of 8, which showed a real effect of counseling conducted in this study.