Gastric pH is an important factor that affects drug absorption, as gastric pH may lead to lower bioavailability, especially for weak-base drugs. Acid-reducing agents (ARAs) such as antacids, histamine-2 receptor antagonists, and proton pump inhibitors, are susceptible to drug-drug interactions (DDIs), potentially resulting in the loss of efficacy. Physiologically based pharmacokinetic (PBPK) modeling is an important tool for the evaluation of oral drug-drug interactions and the most commonly used models include the advanced comparative absorption and transport (ACAT) model and the advanced dissolution, absorption and metabolism (ADAM) model. These models can be used for adjustment of the dosage regimen and the screening of candidate drugs in drug development by simulating the change of gastric pH to predict the change in drug absorption. This review summarizes the theoretical basis, the most common PBPK models used to predict drug absorption, and the effects of different kinds of ARAs drugs on gastric pH. Some successful applications of PBPK modeling in predicting the effects of gastric pH on drug absorption are also presented.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |