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The concept of additive effect is derived from the concept of drug synergy. Thus, the origin of additive effect dates back to the early twentieth century when the search for synergy started. During the search for synergy, the models of Loewe additivity and Bliss independence were proposed. [4]
Antibiotic synergy is one of three responses possible when two or more antibiotics are used simultaneously to treat an infection. In the synergistic response, the applied antibiotics work together to produce an effect more potent than if each antibiotic were applied singly. [ 1 ]
Topics of pharmacodynamics. 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).
Synergy is an interaction or cooperation giving rise to a whole that is greater than the simple sum of its parts (i.e., a non-linear addition of force, energy, or effect). [1] The term synergy comes from the Attic Greek word συνεργία synergia [2] from synergos, συνεργός, meaning "working together".
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:
A codrug consists of two drug moieties, generally "active against the same disease", that are joined through one or more covalent chemical bonds to create a single new chemical entity; [1] they can also be described as a mutual prodrug, recognising that a catabolic biosynthetic step is most often required to liberate the two drugs. [2]
Broadly, a synergist is an entity that displays synergy with respect to another entity. More specifically, a synergist may be: a synergist muscle; a substance that enhances the effect of another substance, such as a drug (see Synergy § Biological sciences) something relating to the theological position of synergism
In toxicodynamics and pharmacodynamics, Loewe additivity (or dose additivity) is one of several common reference models used for measuring the effects of drug combinations. [ 1 ] [ 2 ] [ 3 ] Definition