www.hiv-druginteractions.org Indinavir PK Fact Sheet Reviewed March 2016 Page 1 of 2 For personal use only. Not for distribution. For personal use only. Not for distribution. For personal use only. Not for distribution. Details Generic Name Indinavir Trade Name Crixivan® Class Protease Inhibitor Molecular Weight 711.88 (as sulphate) Structure HO OH N N H H SO N N 2 4 O HN O H3C CH3 H3C Summary of Key Pharmacokinetic Parameters Plasma half life 1.8 ± 0.4 h Cmax 8.97 ± 2.87 µg/ml (800 mg every 8 hours) Cmin 0.146 µg/ml (800 mg every 8 hours) AUC 21.82 ± 8.11 µg/ml.h (800 mg every 8 hours) Bioavailability Approx 65% Absorption Administration of indinavir with a meal high in calories, fat, and protein resulted in a blunted and reduced absorption with an approximate 80 % reduction in AUC and an 86 % reduction in Cmax. Administration with light meals (e.g., dry toast with jam or fruit conserve, apple juice, and coffee with skimmed or fat–free milk and sugar or corn flakes, skimmed or fat–free milk and sugar) resulted in plasma concentrations comparable to the corresponding fasted values. Protein Binding ~60% Volume of Distribution ~1.74 L/kg [1] CSF:Plasma ratio 0.14 [2] Semen:Plasma ratio 1.9 [2] Renal Clearance <20% as unchanged drug Renal Impairment Safety in patients with impaired renal function has not been studied; less than 20% of indinavir is excreted in the urine as unchanged drug or metabolites. Hepatic Impairment Safety and efficacy of indinavir has not been established in patients with significant underlying liver disorders and should be used with caution. © Liverpool Drug Interactions Group, University of Liverpool, Pharmacology Research Labs, 1st Floor Block H, 70 Pembroke Place, LIVERPOOL, L69 3GF. We aim to ensure that information is accurate and consistent with current knowledge and practice. However, the University of Liverpool and its servants or agents shall not be responsible or in any way liable for the continued currency of information in this publication whether arising from negligence or otherwise howsoever or for any consequences arising therefrom. The University of Liverpool expressly exclude liability for errors, omissions or inaccuracies to the fullest extent permitted by law. www.hiv-druginteractions.org Indinavir PK Fact Sheet Reviewed March 2016 Page 2 of 2 For personal use only. Not for distribution. For personal use only. Not for distribution. For personal use only. Not for distribution. Metabolism and Distribution Metabolised by CYP3A4 Inducer of N/A Inhibitor of CYP3A4, P‐glycoprotein [3], MRP1 [4], OATP‐C [5] Transported by P‐glycoprotein [3], MRP1 [4] References Unless otherwise stated (see below), information is from: Crixivan® Summary of Product Characteristics, Merck Sharp & Dohme Ltd. Crixivan® US Prescribing Information, Merck & Co Inc. 1. Zhou J, Havlir DV, Richman DD, et al. Plasma population pharmacokinetics and penetration into cerebrospinal fluid of indinavir in combination with zidovudine and lamivudine in HIV‐1‐infected patients. AIDS. 2000; 14(18): 2869‐2876. 2. Lafeuillade A, Solas C, Halfon P, et al. Differences in the detection of three HIV‐1 protease inhibitors in non‐blood compartments: clinical correlations. HIV Clin Trials. 2002; 3(1): 27‐35. 3. Lee C, Gottesman M, Cardarelli CO, et al. HIV‐1 protease inhibitors are substrates for the MDR1 multidrug transporter. Biochemistry. 1998; 37(11): 3594‐3601. 4. Srinivas R, Middlemas D, Flynn P, Fridland A. Human immunodeficiency virus protease inhibitors serve as substrates for multidrug transporter proteins MDR1 and MRP1 but retain antiviral efficacy in cell lines expressing these transporters. Antimicrob Agents Chemother. 1998; 42(12): 3157‐3162. 5. Tirona R, Leake B, Wolkoff AW, Kim RB. Human organic anion transporting polypeptide‐C (SLC21A6) is a major determinant of rifampicin mediated pregnane X receptor activation. J Pharmacol Exp Ther. 2003; 304(1): 223‐228. © Liverpool Drug Interactions Group, University of Liverpool, Pharmacology Research Labs, 1st Floor Block H, 70 Pembroke Place, LIVERPOOL, L69 3GF. We aim to ensure that information is accurate and consistent with current knowledge and practice. However, the University of Liverpool and its servants or agents shall not be responsible or in any way liable for the continued currency of information in this publication whether arising from negligence or otherwise howsoever or for any consequences arising therefrom. The University of Liverpool expressly exclude liability for errors, omissions or inaccuracies to the fullest extent permitted by law. .