| A. paniculata | Andrographis paniculata (Burm. f.) Nees |
| AG | Andrographolide |
| APE | Andrographis paniculata extract |
| APN | Andrograpanin |
| C0 | Initial concentration |
| CI | Crystallinity index |
| CO2 | Carbon dioxide |
| CSD | Colloidal silicon dioxide |
| DDAG | 14-Deoxy-11,12-didehydroandrographolide |
| DG | Diethylene glycol monoethyl ether |
| ER | Permeability enhancement ratio |
| EtOH | Absolute ethanol |
| HCl | Hydrochloric acid |
| HPLC | High-performance liquid chromatography |
| IACUC KKU | Institutional Animal Care and Use Committee of Khon Kaen University |
| Jss | Permeation flux |
| LM | Liqui-mass |
| Log Po/w | Log octanol-water partition coefficients |
| M⟶S | Mucosal-to-serosal |
| NAG | Neoandrographolide |
| Neusilin | Neusilin® US2 |
| NMP | N-Methyl-2-pyrrolidone |
| O2 | Oxygen |
| Papp | Apparent permeability |
| PBS | Phosphate-buffered saline |
| P-gp | P-glycoprotein |
| PM | Physical mixture |
| PXRD | Powder X-ray diffraction |
| QP-120min | Cumulative permeating amount per area at 120 min |
| QR-5min | Percentage cumulative release at 5 min |
| RE120min | Release efficiency within a 120 min timeframe |
| RH | Relative humidity |
| S⟶M | Serosal-to-Mucosal |
| SD | Standard deviation |
| TLC | Thin-layer chromatographic |