Chapter 3
Farmacocinética
Farmacocinética: Visão Geral
Pharmacokinetics is a scientific discipline that focuses on the journey of a drug within the body, encompassing four key stages: absorption, distribution, ...
Mecanismo de Absorção de Fármacos: Transporte Passivo pela Membrana
Passive transport is a method of drug absorption where small, lipid-soluble drugs can move across the cell membrane. This movement happens along the ...
Mecanismo de Absorção de Fármacos: Transporte Mediado por Carreador de Membrana
Certain large, lipid-insoluble drug molecules that resemble amino acids, peptides, or glucose, require specialized carrier proteins to facilitate their ...
Absorção de Fármacos: Fatores que Afetam a Absorção Gastrointestinal
The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to ...
Biodisponibilidade: Visão Geral
Bioavailability refers to the proportion of an unaltered drug that, after administration, enters the systemic circulation and can be distributed to the ...
Fatores que Influenciam a Biodisponibilidade: Eliminação de Primeira Passagem
When a drug is taken orally, it undergoes a journey starting from the gastrointestinal (GI) tract, passing through the portal vein, reaching the liver, ...
Bioequivalência: Visão Geral
Pharmaceutical equivalents, by definition, are drug products with the same active ingredient in the same quantities, encapsulated in identical dosage ...
Efeito de Primeira Passagem
Presystemic elimination, or the first-pass effect, is the metabolism of drugs that reduces their effective concentration at the site of action. Apart from ...
Curso Temporal do Efeito do Fármaco
The progression of a drug's impact can be analyzed by examining both the concentration-time course and the effect-time course. The concentration-time ...
Distribuição de Fármacos: Ligação a Tecidos
Upon entering the systemic circulation, drugs can distribute into the interstitial and intracellular fluid of various tissue cells. This distribution is ...
Barreiras Fisiológicas
Physiological barriers are semi-permeable cellular structures restricting drug diffusion into intracellular compartments and tissues. There are six types ...
Distribuição de Fármacos: Ligação a Proteínas Plasmáticas
Drugs predominantly attach to plasma proteins, with only a small percentage remaining unbound. The unbound portion can be calculated as one minus the ...
Modelos de Compartimentos: Modelo de Compartimento Único
The single-compartment model serves as a simplified representation of the human body. This model assumes that the body functions as a single, well-mixed ...
Modelos de Compartimentos: Modelo de Dois Compartimentos
The two-compartment model divides the body into central and peripheral compartments to account for varying blood perfusion rates among organs and tissues, ...
Distribuição de Fármacos: Volume de Distribuição
The volume of distribution refers to the theoretical volume necessary to contain the entire amount of an administered drug at the same concentration ...
Biotransformação de Fármacos: Visão Geral
Pharmaceutical substances known as xenobiotics are predominantly lipophilic and nonionized. This enables them to permeate lipid bilayers, such as cell ...
Metabolismo de Fármacos: Reações da Fase I
A phase I reaction is a biochemical process that introduces a functionally reactive polar group to a substance. This transformation predominantly occurs ...
Metabolismo de Fármacos: Reações da Fase II
Phase II reactions are essential for the detoxification and elimination of drugs from the body. These reactions involve the conjugation of parent drugs or ...
Eliminação de Fármacos pela Via Renal: Filtração Glomerular
The kidney serves as the primary organ responsible for eliminating drugs and their metabolites from the body. This process, known as renal elimination, ...
Eliminação de Fármacos pela Via Renal: Reabsorção Tubular
During the process of renal excretion, as the glomerular filtrate progresses to the distal convoluted tubule (DCT), drugs that are highly permeable, ...
Eliminação de Fármacos pela Via Renal: Secreção Tubular
Once the process of glomerular filtration is completed, blood carrying unfiltered drug molecules traverses through efferent arterioles and makes its way ...
Eliminação de Fármacos: O Conceito de Depuração
Drug elimination refers to removing drugs from the body, either through urine by the kidneys or through bile by the liver. Drug clearance is a ...
Eliminação de Fármacos: Vias Não Renais
The liver plays a pivotal role in eliminating drugs and their metabolites, primarily through a process known as biliary excretion. This process involves ...
Cinética da Eliminação de Fármacos
Eliminating drugs from the body is a vital process that occurs through excretion or metabolism. Understanding the kinetics of drug elimination is crucial ...
Concentração de Estado Estacionário
A steady state refers to the level of a drug in the body once it has reached an equilibrium between administration and elimination. It represents the ...
Regime de Dosagem de Medicamentos: Visão Geral
A drug dosage regimen describes the specific instructions and schedule for administering a drug to a patient. It considers factors such as drug dosage, ...
Regime de Dosagem Racional: Dose de Manutenção e Dose de Carga
A rational dosage regimen considers a drug's pharmacokinetics, including its absorption, distribution, metabolism, and elimination from the body. By ...
Regime de Dosagem: Dose Fixa
Fixed-dose regimens are a common approach to administer drugs to achieve and maintain desired levels of the drug in the body. In this dosing strategy, a ...
Pró-fármacos
Prodrugs are a class of pharmaceutical compounds that undergo a biotransformation process within the body to be converted into a pharmacologically active ...
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