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ABSTRACT BACKGROUND: Chronic Obstructive Pulmonary Disease (COPD) and asthma are the two main forms of Obstructive Lung Diseases (OLD). Due to the airway lumen narrowing, they are characterized by reduced airflow out of the lungs. Since inhalers make it easier to administer medication to the respiratory tract, they are the treatment of choice. Inhalers aid in preventing flare-ups and the worsening of symptoms. However, in order to achieve the desired therapeutic effect, the inhalers must be used correctly. The patient may make mistakes when using the inhalers because they may not receive enough information or counselling. A higher prognosis for obstructive pulmonary disease is linked to appropriate medication adherence and usage. Appropriate patient counselling reduces the likelihood of inhalational technique errors and increases adherence to inhalers. AIM: To investigate how often inhalers are prescribed and assess how well Obstructive Lung Disease patients adhere to their inhalational regimen. OBJECTIVE: To study the prescribing pattern of inhalers in Obstructive Lung Disease, to find the errors in inhalational techniques before and after patient counselling and to evaluate the adherence to inhalers before and after counselling in patients with Obstructive Lung Disease. MATERIALS AND METHODS: 61 patients with COPD or asthma were included in a prospective observational study. Proforma from the outpatient record and in-person interviews with the patient were used to gather patient data. Patients were instructed to use their inhalers, and a standard checklist was used to evaluate any errors in inhalation technique. The Evaluation of Adherence to Inhalers (EAI), a 12-item questionnaire, was used to evaluate inhaler adherence. The total questionnaire score was used to calculate adherence. Following the evaluation, each participant received instruction and counselling on appropriate inhalation techniques. A month after the patient counselling, the assessment of inhalational technique errors and the adherence test were conducted again. RESULT: According to the study, 44.26% of the sample was older than 60. Of them, women made up the majority (63.9%). Patients with asthma made up about 60.6% of the total. 80.3% of patients only use one inhaler at a time. The MDI was the most commonly used inhaler (42.6%), followed by the DPI (45.9%) and the MDI with spacer (11.48%). Budesonide + Formoterol fumarate combination is the most commonly used inhalation medication. The age group of 41-60 years old had the lowest error frequency (p value <0.05), followed by that of 61-80 years old. Following patient counselling, patients with COPD and asthma were more likely to adhere to their inhalers (P value = 0.003). CONCLUSION: The majority of patients exhibited difficulty in correctly using the MDI with spacer. All medical professionals need to be more aware of this; in particular, pharmacists should make sure they understand the proper way to use inhalers, even though the majority of patients in our study were actually given advice on how to use them by nurses. Patients with asthma and COPD were more often prescribed Formoterol + Budesonide inhalers. Since there was a significant improvement in adherence to inhalers following pharmacist intervention in our study, the current results demonstrated that pharmacist counselling can improve adherence to inhalers in patients with Obstructive Lung Disease.