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Related Concept Videos

Formulation and Manufacturing Process: Physical Attributes of Generic Tablets and Capsules01:18

Formulation and Manufacturing Process: Physical Attributes of Generic Tablets and Capsules

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Bioequivalence in generic drugs, such as tablets and capsules, refers to their pharmaceutical equivalence to the brand-name counterparts. However, for therapeutic equivalence, manufacturers must also consider physical attributes like size, shape, and weight (FDA Guidance for Industry, December 2003). Discrepancies in these aspects could impact patient compliance and cause medication errors. For instance, swallowing difficulties, often experienced with larger tablets or capsules, can lead to...
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Bioavailability: Overview01:17

Bioavailability: Overview

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Bioavailability refers to the proportion of an administered drug that reaches the systemic circulation in its active, unaltered form. It is a crucial pharmacokinetic parameter that determines the effectiveness of a drug in achieving its intended therapeutic outcomes. The route of administration significantly influences bioavailability, with intravenous administration achieving 100% bioavailability as the drug directly enters the bloodstream. In contrast, oral administration often results in...
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Bioavailability: Overview01:13

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Bioavailability refers to the proportion of an unaltered drug that, after administration, enters the systemic circulation and can be distributed to the desired action site. Factors such as gastrointestinal (GI) absorption and liver biotransformation influence the bioavailability of a drug when it is administered orally. When a drug is administered intravenously, it enters the systemic circulation directly; by definition, its bioavailability is assumed to be 100%. The bioavailability of an...
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Bioavailability Study Design: Absolute Versus Relative Bioavailability01:27

Bioavailability Study Design: Absolute Versus Relative Bioavailability

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Bioavailability is a crucial pharmacokinetic parameter that quantifies the proportion of an administered drug that reaches the systemic circulation and is available for therapeutic action. Regulatory agencies mandate the assessment of bioavailability, typically measured as the area under the drug plasma concentration-versus-time curve (AUC), to ensure the efficacy and safety of pharmaceutical products. These evaluations are categorized as absolute and relative bioavailability studies.Absolute...
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Bioavailability Enhancement: Determination and Conceptual Approaches in Overcoming Bioavailability Problems01:22

Bioavailability Enhancement: Determination and Conceptual Approaches in Overcoming Bioavailability Problems

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Body:Bioavailability is a critical pharmacological concept that measures the extent and rate at which an active drug ingredient or therapeutic moiety enters the systemic circulation, remaining unchanged. It's a pivotal factor in determining a drug's efficacy and safety.The Biopharmaceutics Classification System (BCS) plays an essential role in drug development by categorizing drugs into four classes based on their solubility and permeability. This classification aids in understanding drug...
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Bioavailability: Influencing Factors01:22

Bioavailability: Influencing Factors

386
Bioavailability refers to the extent and rate at which a drug reaches systemic circulation in its active form. Extent refers to the amount of the drug that makes it into circulation, while rate is the speed at which it enters circulation. It is influenced by several factors critical for optimizing drug formulations, dosing regimens, and therapeutic outcomes.Physicochemical properties of drugs and formulationsThe solubility, stability, and dissolution rate of a drug significantly impact its...
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Formation of Dispersible Taohong Siwu Tablets
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Bioavailability of propylthiouracil from two formulation tablets.

F K Główka, T W Hermann, J Hermann

    Die Pharmazie
    |December 8, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Propylthiouracil (PTU) bioavailability was compared between Jelfa and Solvay tablets in healthy subjects. Both formulations demonstrated comparable pharmacokinetic profiles and high, statistically similar efficacy, indicating bioequivalence.

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    Area of Science:

    • Pharmacokinetics and Drug Bioavailability
    • Clinical Pharmacology
    • Pharmaceutical Sciences

    Background:

    • Propylthiouracil (PTU) is a critical medication for managing hyperthyroidism.
    • Ensuring consistent bioavailability between different PTU formulations is essential for therapeutic efficacy.
    • Comparative bioavailability studies are necessary to confirm therapeutic equivalence of generic and branded drugs.

    Purpose of the Study:

    • To compare the bioavailability of 50 mg propylthiouracil tablets from Jelfa (Poland) against 50 mg Propycil tablets from Solvay (Germany).
    • To determine if the two PTU formulations are bioequivalent in healthy adult subjects.
    • To evaluate the pharmacokinetic parameters and establish the empirical bioavailability (EBA) of both PTU products.

    Main Methods:

    • An open-label, two-phase, crossover study involving 15 healthy volunteers.
    • Subjects received single doses of either Jelfa or Solvay PTU tablets, separated by a 7-day washout period.
    • Serum drug levels were quantified using High-Performance Liquid Chromatography (HPLC) over 12 hours post-administration; pharmacokinetic analysis was performed using TopFit 2.0 software.

    Main Results:

    • HPLC analysis confirmed adequate separation of PTU and methylthiouracil (internal standard) with retention times of 5.97 and 2.75 minutes, respectively.
    • Pharmacokinetic parameters for both propylthiouracil formulations were not significantly different.
    • The empirical bioavailability (EBA) of Jelfa PTU tablets relative to Solvay PTU tablets was calculated to be 96.8%, demonstrating bioequivalence.

    Conclusions:

    • The 50 mg propylthiouracil tablets manufactured by Jelfa (Poland) are bioequivalent to the 50 mg Propycil tablets manufactured by Solvay (Germany).
    • The study supports the use of a one-compartment body model for propylthiouracil pharmacokinetic calculations, deeming a two-compartment model unnecessary based on the data.
    • These findings assure healthcare providers and patients of the interchangeable therapeutic potential of the two studied PTU formulations.