| HPMC | Hydroxypropyl methylcellulose |
| DPI | Dry powder inhaler |
| COPD | Chronic obstructive pulmonary disease |
| FPD | Fine particle dose |
| ICH | International Council for Harmonisation (of Technical Requirements for Pharmaceuticals for Human Use) |
| PALS | Positron annihilation lifetime spectroscopy |
| RH | Relative humidity |
| AUC | Area under the curve |
| o-Ps | ortho-positronium |
| LOD | Loss on drying |
| Tg | glass transition temperature |
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