Table 1 The main classes of DPIs, based on their intrinsic resistance and pressure drop across the device
From: Dry powder inhalers and the right things to remember: a concept review
| Â | Pressure drop across the device |
|---|---|
Low resistance DPIs | <5 Mbar 1/2 L/min −1 |
Medium resistance DPIs | 5-10 Mbar 1/2 L/min −1 |
High resistance DPIs | >10 Mbar 1/2 L/min −1 |