Certara’s Best of Blogs 2016

A selection of short essays from our blog, written to empower our customers with modeling and simulation (M&S) and regulatory writing solutions in order to help them solve the toughest drug development problems. Certara staff contributions range in topic from pharmacometrics to systems biology to the growing importance of regulatory writing and sharing clinical trial results.

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The Pharmacokinetics of Transdermal Flunixin Meglumine in Holstein Calves

This study describes the pharmacokinetics of topical and intravenous (IV) flunixin meglumine in Holstein calves. Eight male Holsteins calves, aged 6 to 8 weeks, were administered flunixin at a dose of 2.2 mg/kg intravenously. Following a 10-day washout period, calves were dosed with flunixin at 3.33 mg/kg topically (transdermal). Blood samples were collected at predetermined times from 0 […]

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Pharmacokinetics of Oral Terbinafine in Adult Horses

The primary study objective was to compare the pharmacokinetics of p.o. terbinafine alone to p.o. terbinafine administered with p.o. cimetidine in healthy adult horses. The second objective was to assess the pharmacokinetics of terbinafine when administered per rectum in two different suspensions at 30 mg/kg to adult horses. Six healthy adult horses were included in this […]

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Vaccination Mitigates the Impact of PRRSv Infection on the Pharmacokinetics of Ceftiofur Crystalline-free Acid in Pigs

The pharmacokinetics of intramuscularly administered ceftiofur crystalline-free acid (CCFA) were determined in pigs that were clinically healthy (n = 8), vaccinated with a Porcine reproductive and respiratory syndrome modified live virus (PRRS MLV) (n = 10), challenged with wild-type porcine reproductive and respiratory syndrome virus (PRRSv) VR-2385 (n = 10), or vaccinated with PRRS MLV and later challenged with wild-type PRRSv […]

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Estimation of Tulathromycin Depletion in Plasma and Milk after Subcutaneous Injection in Lactating Goats Using a Nonlinear Mixed-effects Pharmacokinetic Modeling Approach

BACKGROUND: Extra-label use of tulathromycin in lactating goats is common and may cause violative residues in milk. The objective of this study was to develop a nonlinear mixed-effects pharmacokinetic (NLME-PK) model to estimate tulathromycin depletion in plasma and milk of lactating goats. Eight lactating goats received two subcutaneous injections of 2.5 mg/kg tulathromycin 7 days apart; blood […]

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Certara’s Simcyp Division Awarded Modeling and Simulation Grant from the US FDA’s Office of Generic Drugs

PRINCETON, NJ – Oct. 19, 2016 – Certara announces that the Office of Generic Drugs (OGD), US Food and Drug Administration (FDA) has awarded it a multi-year research grant to create and validate a physiologically-based pharmacokinetic (PBPK) modeling and simulation framework that complements existing models within the Simcyp Population-based Simulator.

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A Study to Examine the Relationship Between Metritis Severity and Depletion of Oxytetracycline in Plasma and Milk after Intrauterine Infusion

Metritis is a frequent problem in postpartum dairy cows. Intrauterine therapy with the antimicrobial oxytetracycline (OTC) is often used, although this therapy has not been shown to be superior to systemic therapy. The objectives of this study were to (1) determine the plasma and milk concentrations of OTC following intrauterine infusion in postpartum dairy cows […]

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Model-Based Meta-Analysis of the HbA1c Lowering Effect Of PF-04971729, a Sodium Glucose Co-Transporter-2 Inhibitor (SGLT2i), In Comparison to Other SGLT2i And Anti-Diabetic Agents (ADA)

PF-04971729 is a potent, selective SGLT2i in development for treatment of type 2 diabetes mellitus (T2DM). Since there is growing recognition of the need for comparative effectiveness of various ADA, a model was developed to quantify time course of dose vs HbA1c response of PF-04971729 relative to other ADA including SGLT2i, DPP4 inhibitors (DPP4i), GLP-1 […]

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Model-Based Meta-Analysis of the Effect on Body Weight of PF-04971729, a Sodium Glucose Co-Transporter-2 Inhibitor (SGLT2i), in Comparison to other SGLT2i and Anti-Diabetic Agents (ADA)

PF-04971729 is a potent, selective SGLT2i in development for treatment of type 2 diabetes mellitus (T2DM). Since there is growing recognition of the need for comparative effectiveness of various ADA, a model was developed to quantify the time course of dose vs body weight change for PF-04971729 relative to other ADA including SGLT2i, DPP4 inhibitors […]

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Understanding the Relationship between Systemic and Hepatic Exposure of Obeticholic Acid for the Treatment of Liver Disease in Patients with Cirrhosis

Obeticholic acid (OCA) is a selective and potent farnesoid X receptor (FXR) agonist in development for several chronic liver diseases. OCA is a semi-synthetic analogue of chenodeoxycholic acid (CDCA) with similar pharmacokinetic (PK) properties. There was a significant increase in systemic exposure of OCA in patients with hepatic impairment. A proportionally similar increase in systemic […]

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