Clinical Evaluation of Simcyp-Guided Simvastatin Dosing in Patients With Liver Cirrhosis

This was a prospective, open-label, parallel interventional clinical study conducted over a three-month period in Egyptian cirrhotic patients with portal hypertension. Thirty patients were screened for eligibility. Eight patients were excluded as they did not meet the predefined inclusion criteria. A total of 22 patients were enrolled and completed the study. Adult patients aged ≥18 years with confirmed liver cirrhosis and portal hypertension without a history of variceal bleeding were eligible for inclusion. Patients with severe renal impairment, pregnancy, known hypersensitivity to statins, active malignancy within the previous two years, or recent use of strong CYP3A4 inhibitors were excluded. Patients were stratified according to Child-Pugh (CP) classification into CP class A and CP class B groups. Simvastatin doses were determined using physiologically based pharmacokinetic (PBPK) modeling via the Simcyp® Simulator to account for hepatic impairment-related changes in drug exposure. CP class A patients received simvastatin 15 mg once daily, while CP class B patients received simvastatin 5 mg once daily. Clinical evaluation included Doppler ultrasonographic assessment of portal and hepatic hemodynamics, including portal vein diameter, portal vein velocity, congestion index, and hepatic artery resistive index. Laboratory investigations included liver function tests (ALT, AST, total bilirubin, and serum albumin), renal function tests (serum creatinine and BUN), complete blood count, and creatine kinase for safety monitoring. Patients were followed monthly throughout the 3-month study period, with systematic documentation of adverse events.