Tag: MILK-PBPK

Reflections on the 2025 Florida Winter School: Shaping the future of PBPK scientists in Model Informed Drug Development (MIDD)

Starting a PhD journey is filled with mixed feelings of excitement and uncertainties for most people. More often than acknowledged, the uncertainty curve gets twisted frequently, and this is very apparent in the conceptualization stage of the journey (first year). One thing that tends to relieve the anxiety and pressure is getting to interact with fellow scholars and academics wrestling with difficult concepts during the PhD journey…

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[Research Paper] Using PBPK modeling to supplement clinical data and support the safe and effective use of dolutegravir in pregnant and lactating women

Read the paper here Optimal dosing in pregnant and lactating women requires an understanding of the pharmacokinetics in the mother, fetus, and breastfed infant. Physiologically-based pharmacokinetic (PBPK) modeling can be used to simulate untested scenarios. A PBPK model for the antiretroviral dolutegravir was verified using reported exposures in non-pregnant healthy volunteers, pregnant women, and the umbilical cord, lactating mothers, and breastfed neonates. Abstract Optimal dosing in pregnant and lactating women requires an understanding of the pharmacokinetics in the mother, fetus, and breastfed infant. Physiologically‐based pharmacokinetic (PBPK) modeling can be used to simulate untested scenarios and hence supplement clinical data to support dosing decisions. A PBPK model for the antiretroviral dolutegravir (mainly metabolized by UGT1A1) was verified using reported exposures in non‐pregnant healthy volunteers, pregnant women, and the umbilical cord, lactating mothers, and breastfed neonates. The model was then applied to predict the impact of UGT1A1 phenotypes in extensive (EM), poor (PM), and ultra‐rapid metabolizers (UM). The predicted dolutegravir maternal plasma and umbilical cord AUC in UGT1A1 PMs was 1.6‐fold higher than in EMs. The predicted dolutegravir maternal plasma and umbilical cord AUC in UGT1A1 UMs mothers was 1.3‐fold lower than in EMs. The predicted mean systemic and umbilical vein concentrations were in excess of the dolutegravir IC90 at 17, 28, and 40 gestational weeks, regardless of UGT1A1 phenotype, indicating that the standard dose of dolutegravir (50 mg q.d., fed state) is generally appropriate in late pregnancy, across UGT1A1 phenotypes. Applying the model in breastfed infants, a 1.5‐, 1.7‐, and 2.2‐fold higher exposure

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[Research Paper] Attaining Equity of Access to Research: Perspective on Research in Pregnancy and Breastfeeding Following Dolores Shockley Lecture at ASCPT2024

Abstract Everybody deserves access to evidence-based information to make decisions about their health. However, in many situations, clinical trial eligibility criteria mean that specific data do not exist for certain groups of individuals. These include pregnant and breastfeeding women, children, older people, those with hepatic and renal dysfunction, those with acute severe illness, and those with multiple co-morbidities and interacting medications. Resultantly, there may not be specific drug-dosing information for many patients who are treated in a clinical setting. The ASCPT2024 Dolores Shockley Lecture focused on the equitable access to research with a specific focus on clinical pharmacology studies in pregnancy and breastfeeding. To ensure the safe, effective use of medication in pregnancy and breastfeeding, women should be included in clinical trials and pharmacokinetic studies when a medication is anticipated to be used in women of childbearing potential. Community groups should be involved at all stages of research to maintain transparency and trust. This ensures that local priorities are investigated, that communities understand the findings and are empowered to make evidence-based decisions about their own medication use. Principles informing the design of such studies in pregnancy and lactation are in existence. Mathematical techniques such as physiologically-based pharmacokinetic modeling and stochastic simulation and estimation can enhance study design, and population pharmacokinetic modeling be used to understand variability within and between individuals. Data should be made findable, accessible, interoperable, and reusable (FAIR). Information (and where necessary, training) regarding the use of these approaches should be provided to decision-making stakeholders such as ethics

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[Newsletter] Maternal and Infant Lactation pharmacoKinetics (MILK) study newsletter (Q1 2024)

This newsletter from the Uganda chapter of Pharmacometrics Africa offers unique insights into the current status of the Maternal and Infant Lactation pharmacoKinetics (MILK) project. Highlights from this issue: #PBPK2024 reportback; completion of recruitment into the TB treatment and antimalarial lactation pharmacokinetic studies; completion of the Language Matters pilot study exploring terms for female reproductive life in six Ugandan languages; and receipt of several awards to the At The EQUATOR team and Professor Catriona Waitt Read more about the program below, or view the newsletter here. About MILKAbout half of all women worldwide require medication whilst breastfeeding. Historically, breastfeeding women have been excluded from drug research, largely with the intention of protecting the mothers and their infants from harm. However, lack of data to inform safe medication use in this population itself brings risk. In low-income settings drugs are frequently used ‘off-label’ through necessity and in high-income settings the ‘safest’ recommendation may be to avoid breastfeeding. MILK strengthens existing collaborations and my existing work on HIV antiretrovirals by studying treatments for several priority infections (tuberculosis, malaria and maternal infection around the time of delivery) in breastfeeding mother-infant pairs. Carefully designed clinical studies with mathematical (pharmacometric) approaches to data analysis will elucidate drug transfer from mother to breastfed infant. Work with patient groups and policymaking stakeholders maximises impact through data sharing and prioritisation of ongoing work.

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Delegates explore a hands-on case scenario

A Catalyst for Change: PBPK Workshop in Kampala, Uganda

The PBPK2024 workshop in Kampala was a catalyst for change, offering a promising avenue to optimize drug therapy for the most complex and understudied populations. The workshop which is believed to be the first of its kind in Africa sent a strong foundation for collaboration, networking and building a strong and committed team of PK modellers in the global south.

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Uganda Chapter – Maternal and Infant Lactation pharmacoKinetics (MILK) study newsletter (July – December 2023)

This newsletter from the Uganda chapter of Pharmacometrics Africa offers unique insights into the current status of the Maternal and Infant Lactation pharmacoKinetics (MILK) project. Highlights from this issue: The MILK study team celebrates 70% recruitment into the malaria and TB pharmacokinetic studies; presentations at several international conferences; increased engagement with communities including several new public engagement projects; and a profile of our postdoctoral pharmacokinetic modeller, Francis Williams Ojara. Read more about the program below, or view the newsletter here. About MILKAbout half of all women worldwide require medication whilst breastfeeding. Historically, breastfeeding women have been excluded from drug research, largely with the intention of protecting the mothers and their infants from harm. However, lack of data to inform safe medication use in this population itself brings risk. In low-income settings drugs are frequently used ‘off-label’ through necessity and in high-income settings the ‘safest’ recommendation may be to avoid breastfeeding. MILK strengthens existing collaborations and my existing work on HIV antiretrovirals by studying treatments for several priority infections (tuberculosis, malaria and maternal infection around the time of delivery) in breastfeeding mother-infant pairs. Carefully designed clinical studies with mathematical (pharmacometric) approaches to data analysis will elucidate drug transfer from mother to breastfed infant. Work with patient groups and policymaking stakeholders maximises impact through data sharing and prioritisation of ongoing work.

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