Inhalers are a common treatment for respiratory conditions such as asthma or chronic obstructive pulmonary disease (COPD). The inhaler device is designed to increase the effectiveness and reduce side effects of the drug compared to the systemic route. However, achieving the optimal effect of the drug depends heavily on the inhalation technique of the patient. Currently on the market there are many different inhalers with different operating principles. This article will give you an overview of the popular inhalers on the market and how they work.