46.下列何種 HMG-CoA 還原酶抑制劑具活性代謝物?
(A)atorvastatin
(B)pravastatin
(C)fluvastatin
(D)pitavastatin
統計: A(2890), B(735), C(690), D(613), E(0) #2866784
詳解 (共 10 筆)
Atorvastatin其代謝物有活性,所以半衰期長,
☆Statin類Prodrug(要活化)是simvastatin,lovastatin
記憶:「賣滷心」
(A) atorvastatin (正確)
本身就是活性藥(不是 prodrug),經 CYP3A4 代謝 產生「活性代謝物」
o-OH-atorvastatin(活性、半衰期較長、效果強)
p-OH-atorvastatin(活性、較弱)
所以 母藥 + 代謝物 都有活性 → 整體作用時間變長
這就是為什麼 atorvastatin 半衰期功能上很長(~14 hr + 活性代謝物)
(B) pravastatin 錯
不是 prodrug(本身就活性),幾乎不經 CYP450 代謝,沒有重要的活性代謝物
➡️ 所以不符合題目
(C) fluvastatin 錯
經 CYP2C9 代謝,但代謝物 幾乎沒有活性
(D) pitavastatin錯
代謝少(主要 glucuronidation),
CYP involvement 很低,沒有重要活性代謝物
Atorvastatin is administered in its active acid form and undergoes extensive first - pass metabolism mainly by cytochrome P450 3A4 (CYP3A4) in the liver [10], the organ that is also its primary site of action. Liver metabolism produces two active hydroxy metabolites, ortho - hydroxy- atorvastatin (o - OH - atorvastatin) and para- hydroxy - atorvastatin (p - OH - atorvastatin), and three corresponding inactive lactone metabolites
The o-OH- atorvastatin metabolite has been shown to have a longer half-life and a more potent cholesterol- lowering effect compared to the parent drug, while the p-OH-atorvastatin metabolite has a shorter half-life and a weaker cholesterol-lowering effect.
atorvastatin-N-glucuronide,atorvastatin-N-glucoside,atorvastatin-N-oxide Datorvastatin
lactone。
文獻出處https://academic.oup.com/ndt/article/18/5/967/1833173
HMG-CoA inhibitor 簡易表格整理
| CYP3A4代謝 | Atorvastatin, Simvastatin, Lovastatin |
| CYP2C9代謝 | Rosuvastatin, Fluvastatin |
| 不經CYP代謝 | Pravastatin |
| 腎功能不佳可用 | Atorvastatin, Fluvastatin |
| Prodrug | Simvastatin, Mevastatin, Lovastatin |
| 長效 | Atorvastatin, Rosuvastatin |

statin類有沒有活性代謝物:
Pita 付錢買 prada
Pitavastatin Fluvastatin Pravastatin