scholarly journals Simulation of the impact of rifampicin on once-daily darunavir/ritonavir pharmacokinetics and dose adjustment strategies: a population pharmacokinetic approach

2015 ◽  
Vol 71 (4) ◽  
pp. 1041-1045 ◽  
Author(s):  
Laura Dickinson ◽  
Alan Winston ◽  
Marta Boffito ◽  
Saye Khoo ◽  
David Back ◽  
...  
Keyword(s):  
Dose Adjustment ◽  
Population Pharmacokinetic ◽  
Once Daily ◽  
Adjustment Strategies ◽  
The Impact ◽  
Pharmacokinetic Approach

scholarly journals Population pharmacokinetic evaluation and optimization of amikacin dosage regimens for the management of mycobacterial infections

2020 ◽  
Vol 75 (10) ◽  
pp. 2933-2940
Author(s):  
Hinke Siebinga ◽  
Fiona Robb ◽  
Alison H Thomson
Keyword(s):  
Dose Adjustment ◽  
Population Pharmacokinetic ◽  
Limited Information ◽  
Once Daily ◽  
Mycobacterial Infections ◽  
Dosing Interval ◽  
Dosage Regimens ◽  
Population Pk ◽  
Post Infusion ◽  
Dosage Guidelines

Abstract Background There is limited information on amikacin pharmacokinetics (PK) and dose requirements in patients with mycobacterial infections. Objectives To conduct a population PK analysis of amikacin data from patients with mycobacterial infections and compare predicted concentrations from standard and modified dosage guidelines with recommended target ranges. Methods A population PK model was developed using NONMEM. Cmax, Cmin, concentration 1 h post-infusion (C1h) and AUC0–24 using 15 mg/kg daily (once daily), the WHO table, 25 mg/kg three times weekly (TTW) and modified guidelines were compared using Monte Carlo simulations of 1000 patients. Results Data were available from 124 patients (684 concentrations) aged 16–92 years. CL was 4.64 L/h per 100 mL/min CLCR; V was 0.344 L/kg. With once-daily regimens, Cmax was 35–45 mg/L in 30%–35% of patients and 35–50 mg/L in 46%–48%; C1h was 25–40 mg/L in 53%–59%. The WHO table produced high Cmax values in patients <60 kg and low in patients >75 kg. With TTW dosing, around 30% of Cmax values were 65–80 mg/L, 40% were 60–80 mg/L, and 48% of C1h were 45–65 mg/L. Increasing the dosage interval for patients with CLCR <50 mL/min reduced Cmin values >2 mg/L from 34% to 25% for once-daily dosing and from 18% to 13% for TTW. In patients whose Cmin was <2 mg/L, 82% of AUC0–24 values were 100–300 mg.h/L. Conclusions Standard amikacin dosing guidelines achieve low percentages of target concentrations for mycobacterial infections. Extending the dosing interval in renal impairment and widening target ranges would reduce the need for dose adjustment.

scholarly journals 1558. A Population Pharmacokinetic Model for Posaconazole Intravenous Solution and Oral Powder for Suspension Formulations in Pediatric Patients With Neutropenia

2019 ◽  
Vol 6 (Supplement_2) ◽  
pp. S569-S569
Author(s):  
Gregory A Winchell ◽  
Rik de Greef ◽  
Rebecca E Wrishko ◽  
Eric Mangin ◽  
Hetty Waskin ◽  
...  
Keyword(s):  
Goodness Of Fit ◽  
Geometric Mean ◽  
Age Groups ◽  
Invasive Fungal Disease ◽  
Population Pharmacokinetic ◽  
Once Daily ◽  
Intravenous Solution ◽  
Backward Procedure ◽  
Using Data ◽  
The Impact

Abstract Background Posaconazole is approved in adults for prophylaxis and treatment of invasive fungal disease. Two formulations that offer weight-based dosing—intravenous (IV) and oral powder for suspension (PFS)—are being evaluated in children. A population pharmacokinetic (popPK) approach was used to characterize and predict the PK exposure of posaconazole PFS and IV formulations in children to identify dosages associated with achieving a target PK of 1200 ng/mL as the mean Cavg and individual Cavg ≥500 ng/mL and <2500 ng/mL in ~90% of patients. Methods A popPK model was developed through nonlinear mixed-effects modeling using data obtained from a trial in children with neutropenia (ClinicalTrials.gov, NCT02452034; Merck protocol, MK-5592-097). Three dose cohorts (3.5, 4.5, and 6 mg/kg/day [≤300 mg/day]) were studied in two age groups (2–<7 years and 7–17 years). Posaconazole IV was administered twice on day 1 then once daily through at least day 10, followed by PFS once daily through day 28 at clinician discretion. A compartmental model, including both formulations, was fit to the data. Model selection was based on the Log-Likelihood Criterion, goodness-of-fit plots, and scientific plausibility. Significance of the covariates was assessed in a stepwise forward inclusion/backward procedure. An additional assessment characterized the impact of different food covariates on bioavailability. Results An open one-compartmental PK model with first-order absorption and estimated bioavailability, as well as allometrically scaled effects of body weight on clearance and volume, adequately described the PK of posaconazole IV and PFS formulations. Model predictions are shown in the Table. Effects of the different food covariates were not statistically significant. Simulations indicated that for the 6-mg/kg/d dose, model-predicted Cavg generally met PK targets. Model-predicted Cavg was ≥500 ng/mL in >90% of subjects in all cohorts. The 1200-ng/mL target geometric mean Cavg was achieved for all but the 2–<7 years cohort receiving the PFS formulation. Conclusion This popPK-based analysis demonstrated that the 6-mg/kg/d dose of IV or PFS posaconazole formulation (≤300 mg/days) is appropriate for children (2–17 years) and that PFS can be administered without regard to food. Disclosures All authors: No reported disclosures.

scholarly journals Simulation of the impact of rifampicin on darunavir/ritonavir PK and dose adjustment strategies in HIV-infected patients: a population PK approach

2014 ◽  
Vol 17 ◽  
pp. 19586 ◽  
Author(s):  
Laura Dickinson ◽  
Alan Winston ◽  
Marta Boffito ◽  
Saye Khoo ◽  
David Back ◽  
...  
Keyword(s):  
Dose Adjustment ◽  
Population Pk ◽  
Adjustment Strategies ◽  
The Impact

scholarly journals Covariate effects and population pharmacokinetic analysis of the anti-FGFR2b antibody bemarituzumab in patients from phase 1 to phase 2 trials

2021 ◽  
Author(s):  
Hong Xiang ◽  
Lucy Liu ◽  
Yuying Gao ◽  
Ago Ahene ◽  
Helen Collins
Keyword(s):  
Serum Concentration ◽  
Dose Adjustment ◽  
Central Compartment ◽  
Volume Of Distribution ◽  
Pharmacokinetic Analysis ◽  
Population Pharmacokinetic ◽  
Concentration Data ◽  
Phase 3 ◽  
The Impact ◽  
Significant Covariates

Abstract Purpose A population pharmacokinetic (PK) analysis of the anti-fibroblast growth factor receptor 2b antibody, bemarituzumab, was performed to evaluate the impact of covariates on the PK and assess whether dose adjustment is necessary for a future phase 3 trial. Methods Serum concentration data were obtained from three clinical trials, with 1552 bemarituzumab serum samples from 173 patients, and were analyzed using nonlinear mixed-effects modeling. Results A two-compartment model with parallel linear and nonlinear (Michaelis–Menten) elimination from the central compartment best described the bemarituzumab serum concentration data. The final model estimated a typical linear clearance (CL) of 0.311 L/day, volume of distribution in the central compartment (Vc) of 3.58 L, distribution clearance (Q) of 0.952 L/day, volume of distribution in the peripheral compartment (Vp) of 2.71 L, maximum drug elimination by nonlinear clearance (Vmax) of 2.80 μg/day, and Michaelis–Menten constant (Km) of 4.45 μg/mL. Baseline body weight, baseline albumin, gender, and chemotherapy were identified as statistically significant covariates on the PK of bemarituzumab. Given the low interindividual variability of bemarituzumab key PK parameters (CL and Vc) and the small or modest effect of all statistically significant covariates on bemarituzumab exposure at steady-state, no covariate is expected to have clinically meaningful effects on bemarituzumab exposure. Conclusion No covariate had a clinically meaningful impact on bemarituzumab exposure. These results indicate that dose adjustment of bemarituzumab is not necessary, based on the aforementioned covariates, for a future phase 3 trial in gastric and gastroesophageal junction adenocarcinoma population with FGFR2b overexpression in combination with mFOLFOX6.

scholarly journals Once-Daily Amikacin Dosing in Burn Patients Treated with Continuous Venovenous Hemofiltration

2011 ◽  
Vol 55 (10) ◽  
pp. 4639-4642 ◽  
Author(s):  
Kevin S. Akers ◽  
Jason M. Cota ◽  
Christopher R. Frei ◽  
Kevin K. Chung ◽  
Katrin Mende ◽  
...  
Keyword(s):  
Burn Injury ◽  
Continuous Venovenous Hemofiltration ◽  
Burn Patients ◽  
Small Reduction ◽  
Target Attainment ◽  
Clinical Pharmacokinetics ◽  
Once Daily ◽  
Renal Replacement Therapies ◽  
Rapid Clearance ◽  
The Impact

ABSTRACTAmikacin clearance can be increased in burn injury, which is often complicated by renal insufficiency. Little is known about the impact of renal replacement therapies, such as continuous venovenous hemofiltration (CVVH), on amikacin pharmacokinetics. We retrospectively examined the clinical pharmacokinetics, bacteriology, and clinical outcomes of 60 burn patients given 15 mg/kg of body weight of amikacin in single daily doses. Twelve were treated with concurrent CVVH therapy, and 48 were not. The pharmacodynamic target of ≥10 for the maximum concentration of drug in serum divided by the MIC (Cmax/MIC) was achieved in only 8.5% of patients, with a small reduction ofCmaxin patients receiving CVVH and no difference in amikacin clearance. Mortality and burn size were greater in patients who received CVVH. Overall, 172 Gram-negative isolates were recovered from the blood cultures of 39 patients, with amikacin MIC data available for 82 isolates from 24 patients. A 10,000-patient Monte Carlo simulation was conducted incorporating pharmacokinetic and MIC data from these patients. The cumulative fraction of response (CFR) was similar in CVVH and non-CVVH patients. The CFR rates were not significantly improved by a theoretical 20 mg/kg amikacin dose. Overall, CVVH did not appear to have a major impact on amikacin serum concentrations. The low pharmacodynamic target attainment appears to be primarily due to higher amikacin MICs rather than more rapid clearance of amikacin related to CVVH therapy.

Abstract 223: Impact of Differences in Once- vs Twice-Daily Medications Adherence on the Risk of Bleed and Stroke in Non-Valvular Atrial Fibrillation: Analysis of Randomized Trials and Claims Data Sources

2017 ◽  
Vol 10 (suppl_3) ◽  
Author(s):  
Colleen A McHorney ◽  
Eric D Peterson ◽  
Mike Durkin ◽  
Veronica Ashton ◽  
François Laliberté ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Stroke Risk ◽  
Claims Data ◽  
Meta Analysis ◽  
Oral Anticoagulants ◽  
Once Daily ◽  
Cardiovascular Medications ◽  
One Year ◽  
The Impact ◽  
Similar Risk

Background: In non-valvular atrial fibrillation (NVAF) patients, those receiving once-daily (QD) versus twice-daily (BID) non vitamin-K antagonist oral anticoagulants (NOACs) may have better medication adherence. The impact on stroke and bleed risk is not known. Objective: To estimate the impact of adherence differences between QD vs BID therapies on bleed and stroke risks in NVAF patients. Methods: The relation between adherence (proportion of days covered [PDC]) for QD vs BID NOACs and one year bleed risk was modeled using claims data from Truven Health Analytics MarketScan databases (7/2012-10/2015). Next, the relation between adherence and bleeding was calibrated to match that seen in the placebo and NOAC arms of previous randomized controlled trials (RCTs). Finally, we used adherence rates for QD (PDC=0.849) and BID (PDC=0.738) cardiovascular medications from a meta-analysis (Coleman et al.). These rates were used in the calibrated model to estimate bleeds. An analogous method was applied to evaluate the impact of QD vs BID adherence on stroke risk. Results: The relation between PDC and risks of bleed and stroke was modeled using claims data (N=65,022) and calibrated using RCTs. In the calibrated model, compared with BID dosing, QD dosing was associated with 81 fewer strokes (34% reduction) and 14 more bleeds (6% more) per 10,000 patients/year (Figure). Conclusion: Among NVAF patients, better adherence to QD dosing was associated with a significantly lower stroke risk of QD but similar risk of bleed.

FRI0138 THE IMPACT OF UPADACITINIB VERSUS METHOTREXATE OR ADALIMUMAB ON INDIVIDUAL AND COMPOSITE DISEASE MEASURES IN PATIENTS WITH RHEUMATOID ARTHRITIS

2020 ◽  
Vol 79 (Suppl 1) ◽  
pp. 651.1-652
Author(s):  
R. Van Vollenhoven ◽  
A. Ostor ◽  
E. Mysler ◽  
N. Damjanov ◽  
I. H. Song ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Selective Inhibitor ◽  
Response Criteria ◽  
Research Support ◽  
Phase 3 ◽  
Once Daily ◽  
Composite Measures ◽  
Treatment Responses ◽  
The Impact ◽  
Mean Time

Background:In Phase 3 trials, upadacitinib (UPA), an oral JAK1-selective inhibitor, has been assessed as monotherapy vs MTX (SELECT-EARLY1) and in combination with MTX vs adalimumab + MTX (ADA; SELECT-COMPARE2) in RA pts who were MTX naïve or with inadequate responses to MTX (MTX-IR), respectively.Objectives:In this analysis we assessed individual and composite measures of disease activity in SELECT-EARLY and SELECT-COMPARE.Methods:In SELECT-EARLY, MTX-naïve pts received UPA 15 mg or 30 mg monotherapy once daily (QD), or MTX monotherapy, for 12 wks. In SELECT-COMPARE, MTX-IR pts on stable background MTX received UPA 15 mg QD, PBO, or ADA 40 mg every 2 wks for 12 wks. For this analysis, responses at Wk 12 were defined as ≥50% improvement in the 7 components of the ACR response criteria. Among ACR50 responders, the proportions of pts with ≥50% improvement in all 7 components of the ACR criteria was assessed. The proportion of pts achieving TJC68=0 and SJC66=0 was also determined. All analyses were based on observed data without imputation.Results:947 pts were randomized in SELECT-EARLY, and 1629 pts in SELECT-COMPARE. Mean time since RA diagnosis was 2.7 years in SELECT-EARLY (median 6 months) and 8.2 years in SELECT-COMPARE; mean DAS28(CRP) was 5.9 and 5.8, respectively. In SELECT-EARLY, significantly more MTX-naïve pts receiving UPA 15 mg or 30 mg monotherapy achieved ≥50% improvements in all ACR components at Wk 12 compared with MTX (Figure 1a,Figure 1b). In SELECT-COMPARE, significantly more MTX-IR pts on UPA 15 mg + MTX achieved ≥50% improvement in the ACR components vs PBO (all components) and ADA + MTX (all components except SJC and PhGA). Among pts with ACR50 responses at Wk 12, approximately half of the MTX-naïve pts on UPA 15 mg and 30 mg in SELECT-EARLY had ≥50% improvements in all 5 remaining ACR components (pain, PtGA, PhGA, HAQ-DI, hsCRP) compared with 28% with MTX. Corresponding proportions in MTX-IR pts in SELECT-COMPARE were 34% for UPA 15 mg + MTX, 28% for ADA + MTX, and 17% for PBO. UPA treatment also significantly increased the proportions of pts achieving both TJC68=0 and SJC66=0 vs PBO or MTX, and SJC66=0 vs ADA + MTX (Figure 1a,Figure 1b).Conclusion:In MTX-naïve and MTX-IR pts, treatment responses at 12 wks occurred in significantly higher proportions of pts receiving UPA monotherapy vs MTX and UPA + MTX vs PBO for all 7 components of the ACR response criteria, and for 5 of 7 ACR components for UPA + MTX vs ADA + MTX. Favorable outcomes with UPA treatment were evident both in composite and individual parameters.References:[1]van Vollenhoven R, et al. Arthritis Rheumatol 2018;70(Suppl. 10): Abstract 891[2]Fleischmann R, et al. Arthritis Rheumatol 2018;70(Suppl. 10): Abstract 890Disclosure of Interests:Ronald van Vollenhoven Grant/research support from: AbbVie, Arthrogen, Bristol-Myers Squibb, GlaxoSmithKline, Lilly, Pfizer, and UCB, Consultant of: AbbVie, AstraZeneca, Biotest, Bristol-Myers Squibb, Celgene, GSK, Janssen, Lilly, Medac, Merck, Novartis, Pfizer, Roche, and UCB, Andrew Ostor Consultant of: MSD, Pfizer, Lilly, Abbvie, Novartis, Roche, Gilead and BMS, Speakers bureau: MSD, Pfizer, Lilly, Abbvie, Novartis, Roche, Gilead and BMS, Eduardo Mysler Grant/research support from: AbbVie, Amgen, Bristol Myers Squibb, Roche, Eli Lilly, Novartis, Janssen, Sanofi, and Pfizer., Speakers bureau: AbbVie, Amgen, Bristol Myers Squibb, Roche, Eli Lilly, Novartis, Janssen, Sanofi, and Pfizer, Nemanja Damjanov Grant/research support from: from AbbVie, Pfizer, and Roche, Consultant of: AbbVie, Gedeon Richter, Merck, Novartis, Pfizer, and Roche, Speakers bureau: AbbVie, Gedeon Richter, Merck, Novartis, Pfizer, and Roche, In-Ho Song Shareholder of: AbbVie Inc., Employee of: AbbVie Inc., Yanna Song Shareholder of: AbbVie Inc., Employee of: AbbVie Inc., Jessica Suboticki Shareholder of: AbbVie Inc., Employee of: AbbVie Inc., Vibeke Strand Consultant of: AbbVie, Amgen, Biogen, Celltrion, Consortium of Rheumatology Researchers of North America, Crescendo Bioscience, Eli Lilly, Genentech/Roche, GlaxoSmithKline, Hospira, Janssen, Merck, Novartis, Pfizer, Regeneron Pharmaceuticals, Inc., Sanofi, UCB

Model-based analysis to support dose selection of pevonedistat (PEV) combined with azacitidine (AZA) in patients (pts) with higher-risk myelodysplastic syndromes (MDS)/chronic myelomonocytic leukemia (CMML) and acute myeloid leukemia (AML).

2021 ◽  
Vol 39 (15_suppl) ◽  
pp. 7042-7042
Author(s):  
Xiaofei Zhou ◽  
Diane R. Mould ◽  
Dan Zhao ◽  
Mikkael A. Sekeres ◽  
Lionel Adès ◽  
...  
Keyword(s):  
Clinical Benefit ◽  
Phase 1 ◽  
Performance Status ◽  
Disease Type ◽  
International Prognostic Scoring System ◽  
Population Pharmacokinetic ◽  
Starting Dose ◽  
Grade 3 ◽  
The Impact ◽  
Dose Reductions

7042 Background: PEV+AZA has been studied in higher-risk MDS/CMML and AML, with encouraging efficacy and an acceptable safety profile without added myelosuppression. This pooled analysis was performed to evaluate the impact of PEV exposure on safety and efficacy. Methods: Data from three studies (NCT01814826, NCT02782468 and NCT02610777) were used in the PEV exposure–safety analyses, including ≥ grade 3 neutropenia (NEU3), febrile neutropenia (FN), ≥ grade 3 thrombocytopenia, ≥ grade 3 alanine aminotransferase elevation, ≥ grade 3 aspartate aminotransferase elevation and ≥ grade 3 treatment-emergent adverse event (TEAE3), in pts with higher-risk MDS/CMML and AML who received PEV+AZA. Data from NCT02610777 were used for exposure–efficacy analyses, including overall survival (OS), event-free survival (EFS), complete response (CR) and CR+partial response (PR), in pts with higher-risk MDS/CMML who received PEV+AZA. The exposure metrics for individual pts were derived from a previously developed population pharmacokinetic model with pooled data from eight phase 1/2 studies. PEV exposure–safety relationships for the toxicity endpoints, exposure–CR and exposure–CR+PR, were estimated by logistic regression. Age, sex, race, baseline Eastern Cooperate Oncology Group (ECOG) Performance Status score and disease type were evaluated as covariates. Cox proportional-hazards models were used to evaluate the PEV exposure–survival for higher-risk MDS/CMML, with age, sex, baseline ECOG PS score, Revised International Prognostic Scoring System score (IPSS-R) and disease type as potential covariates. Results: In total, 135 pts (median age, 74 years; male, 64%; Caucasian, 82%) and 41 pts (median age, 74 years; male, 76%; Caucasian, 90%; median IPSS-R, 5.5) were included in PEV exposure–safety and exposure–efficacy analyses, respectively. PEV exposure was significantly related to the incidence of NEU3 ( p = 0.003), FN ( p = 0.02) and TEAE3 ( p = 0.02), supporting PEV dose reductions for pts with treatment-related toxicities. Relationships between PEV exposures and CR, CR+PR, EFS or OS indicated consistent clinical benefit across ranges of PEV exposure following a starting dose of 20 mg/m2. Conclusions: The association between exposure and safety supports PEV dose reductions for pts with treatment-related toxicities. The exposure–efficacy analyses indicated consistent clinical benefit across ranges of PEV exposure following a starting dose of 20 mg/m2. These results support a favorable benefit–risk profile of the 20 mg/m2 PEV dose on days 1, 3 and 5 in combination with AZA 75 mg/m2 for 7 days in 28-day cycles. Clinical trial information: NCT01814826 , NCT02782468 , NCT02610777.

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