Drug Synergism
Drug Synergism - Related Videos
01:27
Combined Effects of Drugs: Synergism
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2023
Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs. Such synergistic combinations...
15:04
Potentiation of Anticancer Antibody Efficacy by Antineoplastic Drugs: Detection of Antibody-drug Synergism Using the Combination Index Equation
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Cited by 3 •
2019
This protocol describes how to assess synergism between an anticancer antibody and antineoplastic drugs in preclinical models by using the combination index equation of Chou and Talalay.
05:10
Drug Repurposing Hypothesis Generation Using the "RE:fine Drugs" System
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Cited by 4 •
2016
Here we describe a protocol using the web-based drug repurposing hypothesis generation tool: "RE:fine Drugs." This protocol can be modified to a user's preferences at the level of the query type (gene, drug or disease) and/or the range of available advanced options.
10:47
Using Bioluminescent Imaging to Investigate Synergism Between Streptococcus pneumoniae and Influenza A Virus in Infant Mice
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Cited by 38 •
2011
A concurrent infection with influenza A virus is one of the factors implicated in the induction of invasive pneumococcal disease during asymptomatic Streptococcus pneumoniae carriage. Here we describe a mixed infection method using infant mice to investigate the synergism between these two respiratory pathogens.
07:02
A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development
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Cited by 5 •
2019
A validated computerized battery of neuropsychological and neurophysiological tests is used to study pharmacodynamic effects on the central nervous system of newly developed drugs in early phase development. To demonstrate the test battery, the acute effects of mecamylamine and the reversal of these effects by two agonist drugs are described.
FAQs
Synergy may arise when combined agents influence different but functionally connected molecular targets or biological pathways. Their effects can reinforce one another, producing a response greater than either agent achieves alone. This mechanism is especially relevant when one drug strengthens the pathway-level consequences of another, rather than simply duplicating the same pharmacological action.
One agent can increase the amount of another that reaches its site of action or can enhance that agent’s activity after exposure. The resulting combination effect may exceed the response predicted from each drug’s independent activity. Such interactions show that synergism can depend on pharmacological processing and activity, not only on direct action at separate targets.
Biological systems may activate compensatory responses that weaken the effect of an individual drug. A second agent can block or limit those responses, allowing the initial treatment effect to persist or become stronger. This mechanism helps explain why combinations may outperform single agents, while also emphasizing the need to examine interactions carefully for unintended harmful effects.
Investigators first establish the individual activities of the drugs, then compare the measured combination effect with a predicted additive effect under defined conditions. A combination is considered synergistic when its observed effect exceeds that expectation. This comparison provides a structured way to separate genuine enhancement from a response that merely reflects the summed activities of the agents.
The evaluation begins by measuring each agent’s activity and defining the conditions under which the combination will be tested. Researchers then determine the combined response and compare it with the predicted additive response. Interpreting the difference helps identify enhancement, supports comparison across treatment conditions, and can reveal combinations that warrant closer investigation for harmful interactions.
Combination studies are useful when a disease involves interconnected biological pathways or when one agent’s effect is limited by compensatory responses. Demonstrated synergy may support effective treatment with lower doses and potentially reduced toxicity. Pharmacologists also examine combinations to identify harmful interactions and to guide strategies for managing complex diseases.