Effects of Amlodipine on the pharmacokinetics of Repaglinide
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암로디핀과 레파그리니드의 병용은 당뇨병의 합병증으로인한 고혈압 유발 시 병용 처방될 수 있다. 암로디핀과 레파그리니드의 약동학적 상호작용 연구를 위하여 암로디핀 (0.1 및 0.4 mg/kg) 과 레파그리니드를 흰 쥐에 경구(0.5 mg/kg) 및 정맥 (0.2 mg/kg) 투여하여 연구를 실시하였다. 암로디핀이 cytochrome P450 (CYP) 3A4 활성과P-glycoprotein (P-gp)의 활성에 미치는 영향도 평가하였다. 암로디핀의 CYP3A4의 50% 효소활성억제는 9.1 μM 이었다. 암로디핀은 P-gp의 활성에는 영향을 미치지 않았다. 암로디핀 (0.4 mg/kg)은 레파그리니드의 혈장곡선하면적(AUC)과 최고혈장농도 C_(max)를 40.2% 와 22.2% 각각 유의성 (p < 0.05)있게 증가시켰다. 따라서, 레파그리니드의상대적생체이용률 (RB)은 암로디핀과 병용투여 시 1.18-1.40 배 증가되었으며, 또한 레파그리니드의 절대적생체이용률(AB)은 대조군과 비교하여 41.0% 유의성 있게 증가되었다. 경구 투여 시와는 대조적으로, 암로디핀은 정맥 내로 투여된 레파그리니드에서는 약동학적 파라미터에 어떤 영향도 미치지 않았다. 따라서 암로디핀이 레파그리니드의 생체이용률을 증가시킨 것은 신장배설 감소 또는 P-gp 활성억제 보다는 암로디핀이 소장 또는 간장에서 CYP3A4을 억제시켰기 때문으로 사료된다. 암로디핀과 레파그리니드의 병용투여 시 레파그리니드의 용량을 조절하는 것이 안전하다고사료된다.
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