Inhaled medications are the preferred therapies for patients with asthma and COPD, but their effectiveness is limited by the patient's ability to use the device properly, an issue often neglected when these medications are prescribed. Correct inhaler technique must be taught and learnt, and requires educational and motivational programs aimed at patients and healthcare providers alike. Written instructions alone are manifestly insufficient: education must include practical demonstration and periodic re-assessment and reeducation, since correct technique and motivation usually deteriorate with time. Several devices are available on the market, the purpose of which is to train patients to use inhalers correctly. They are often directed at particular devices or groups of devices and/or particular critical aspects of technique. This paper reviews the devices currently available for training patients in the correct use of both pressurised metered-dose inhalers (pMDIs) and dry powder inhalers (DPIs).