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The objective of this study was to examine how Inhalation Technique Assessment Service (ITAS) by community pharmacies affect patients' inhalation techniques when using the Respimat® soft mist inhaler. The inhaler was simultaneously updated into a reusable inhaler. The study focused on the Respimat® inhaler because its use is known to be challenging for patients. The study was performed as a pre-post design in 33 community pharmacies (CPs) in Finland. Patients' inhalation technique was assessed before ITAS (baseline) and immediately after ITAS (follow-up 1). Follow-up 2 was performed when the patient came to the pharmacy for a refill (1–3 months after the baseline and the follow-up 1). A Respimat specific twenty item checklist was used to assess inhalation technique. The checklist included 1) preparation steps before the first use of the Respimat® inhaler (8 items) and 2) daily use steps of the Respimat® inhaler (12 items). After ITAS, the patients received a brief questionnaire to assess their asthma/COPD history. A total of 228 patients were enrolled at the first visit (mean age 67.8 years, 61.0% female, 85.5% had previous Respimat® use experience) and 42 of them attended the follow-up 2, 1–3 months later (mean age 70.1 years, 69.0% female, 92.9% had previous Respimat® use experience. The median number of the steps performed correctly increased from 17/20 at the baseline to all the 20 steps at the follow-up 1 (p < 0.001). At the baseline, 27.6% of the patients (n = 228) performed all preparation steps correctly, while 87.3% at the follow-up 1 and 71.4% at the follow-up 2. The percentage of the patients with acceptable inhalation technique (all critical daily use steps correct) increased from 69.7% at the baseline to 93.0% at the follow-up 1 (p < 0.001). The corresponding figure at the follow-up 2 was 69.0%. At the baseline, 30.3% of patients had optimal inhalation technique (all daily use steps correct). At the follow-up 1 corresponding figure was 85.1%, and 54.8% at the follow-up 2. A pharmacist-led intervention significantly improved asthma and COPD patients' inhalation technique with the Respimat® inhaler. Significant improvements were found in the daily use steps and the preparation steps before the first use. [ABSTRACT FROM AUTHOR]