ObjectivesThe main aims of the study were to highlight the impact of clinical pharmacist in patient education on the correct use of inhalers, and its consequences on medication adherence, asthma control and clinical outcomes. Methods Pre-post-interventional study was conducted over two patient visits in Jordan at Alkarak Governmental Hospital. Inhaler technique evaluation was assessed at first and second visits. All patients received inhaler technique counselling service prior to second visit. Patient adherence was assessed using MMAS-8, and asthma control was assessed by spirometry and ATAQ scale. Key findings Complete data were available for 100 patients, 52% women, median age 45 (range 18-60) years and median duration of diagnosis 20 (range 2-55) years. Ninetysix per cent of patients (n = 96) were previously educated about the correct use of inhalers by different healthcare professionals' specialty. There was a statistically significant improvement in the correct handling of inhalers after patient re-education (P = 0.000). There also was a significant improvement in the level of control (from 7% (n = 7) to 90% (n = 90) of participants had high disease control) and adherence (from 6% (n = 6) to 12% (n = 12) of participants had high adherence rate) after education (P = 0.000 and P = 0.000 respectively). Significant number of asthmatic patients uses inhalers incorrectly despite the previous education on the correct inhaler technique. Incorrect use of inhalers is associated with negative outcomes. In this study, the result showed that incorrect handling of MDIs was significantly associated with frequent emergency department (ED) visits and hospitalizations (P = 0.031, P = 0.039) respectively. Conclusions The researchers concluded that effective educational intervention to the patients along with reassessment of inhaler technique and re-education by a well-trained clinical pharmacist gave positive impressive outcomes.