FARMAKOKINETIK ABSORPSI ORAL (PART 1)
Résumé
TLDRThe video provides an overview of pharmacokinetics focusing on the open compartment model for drug absorption, particularly for drugs administered orally versus intravenously. It highlights the differences in absorption processes, with intravenous drugs having 100% bioavailability due to immediate entry into the bloodstream, while oral drugs need to be absorbed through the gastrointestinal tract, leading to variable bioavailability levels. Key pharmacokinetic parameters such as absorption rate, volume of distribution, elimination rates, and their associated formulas are discussed. The video concludes with methods to calculate T-max, the time to reach maximum concentration in the plasma.
A retenir
- 💊 Understanding pharmacokinetics is crucial for drug formulation.
- 📈 Intravenous drugs have 100% bioavailability versus oral drugs.
- 📉 Oral drugs undergo a complex absorption process.
- 🧪 The volume of distribution helps gauge tissue distribution.
- 🕒 T-max is essential for determining peak drug concentrations.
- 📏 Key parameters include absorption rates and elimination rates.
Chronologie
- 00:00:00 - 00:09:45
The video introduces pharmacokinetics, focusing on open compartment models for extravascular drug absorption. It explains the differences between intravenous (IV) and oral drug administration, highlighting that IV drugs have 100% bioavailability due to immediate absorption into the bloodstream, while oral drugs must undergo absorption in the gastrointestinal tract, resulting in variable bioavailability. Key pharmacokinetic parameters such as absorption rate, volume of distribution, and elimination rate are discussed, emphasizing the complexity of oral drug absorption and elimination processes. The video also presents mathematical models to describe these processes, including equations for drug concentration over time and the calculation of maximum plasma concentration (T-max).
Carte mentale
Vidéo Q&R
What is pharmacokinetics?
Pharmacokinetics is the study of how drugs are absorbed, distributed, metabolized, and eliminated in the body.
What is the difference between intravenous and oral drug administration?
Intravenous drugs do not undergo absorption and have 100% bioavailability, while oral drugs must be absorbed in the gastrointestinal tract, leading to variable bioavailability.
What does bioavailability mean?
Bioavailability refers to the proportion of a drug that enters the circulation when introduced into the body and is available for therapeutic effect.
What factors affect drug absorption?
Factors include the drug's formulation, the presence of food in the stomach, and the drug's chemical properties.
What is the formula for calculating the drug elimination rate?
The elimination rate can be modeled as a difference between the absorption and elimination processes of the drug.
How do you determine T-max?
T-max is the time required for the plasma concentration of a drug to reach its maximum value.
What does the variable 'K' represent in pharmacokinetics?
'K' represents the rate constant for drug absorption or elimination.
What is the significance of the volume of distribution (Vd)?
Vd indicates the extent to which a drug is distributed in body tissues compared to the plasma.
What are the critical parameters for absorption kinetics?
Key parameters include the absorption rate constant (Ka) and the fraction of the dose that is absorbed (F).
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Discourse oral genres in professional and academic fields (Genre, language, context)
- Pharmacokinetics
- Open Compartment Model
- Bioavailability
- Intravenous Administration
- Oral Medication
- Absorption Rate
- Elimination Rate
- Volume of Distribution
- Kinetics Parameters
- T-max