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Pharmacodynamics (PD) is the study of the biochemical and physiologic effects of drugs (especially pharmaceutical drugs). The effects can include those manifested within animals (including humans), microorganisms , or combinations of organisms (for example, infection ).
The action of drugs on the human body (or any other organism's body) is called pharmacodynamics, and the body's response to drugs is called pharmacokinetics. The drugs that enter an individual tend to stimulate certain receptors, ion channels, act on enzymes or transport proteins. As a result, they cause the human body to react in a specific way.
When two drugs affect each other, it is a drug–drug interaction (DDI). The risk of a DDI increases with the number of drugs used. [1] A large share of elderly people regularly use five or more medications or supplements, with a significant risk of side-effects from drug–drug interactions. [2] Drug interactions can be of three kinds:
Pharmacodynamics (PD) is the core principle of quantifying the effects of antagonists by measuring the drug’s efficacy and safety. PD emphasises the relationship between the dose and response of a certain drug, which can be illustrated using a dose-response curve .
Beta blockers exert their pharmacological effect, decreased heart rate, by binding to and competitively antagonising a type of receptor called beta adrenoceptors. [1]In pharmacology, the term mechanism of action (MOA) refers to the specific biochemical interaction through which a drug substance produces its pharmacological effect. [2]
Pharmacokinetics is the study of how an organism affects the drug, whereas pharmacodynamics (PD) is the study of how the drug affects the organism. Both together influence dosing , benefit, and adverse effects , as seen in PK/PD models .
The location of the target effect of active substances is usually rather a matter of pharmacodynamics (concerning, for example, the physiological effects of drugs [2]). An exception is topical administration , which generally means that both the application location and the effect thereof is local.
Pharmacotoxicology can be separated into two different categories: pharmacodynamics (the effects of a drug on an organism), and pharmacokinetics (the effects of the organism on the drug). Mechanisms of Pharmaceutical Drug Toxicity