Synergism Assessment
Synergism Assessment - 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...
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.
00:09
Synergizing Antegrade Endoscopic with Bridging Vein Harvesting for Improvement of Great Saphenous Vein Graft Quality from the Lower Leg
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2019
Presented here is a protocol for antegrade endoscopic vein harvesting from the lower leg, which can safely be introduced in routine coronary artery bypass grafting. Vein grafts present excellent graft quality following this standardized protocol with positioning of the legs, minimally invasive access to the vein, and antegrade endoscopic vein harvesting.
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.
08:36
Neurotoxicity Assessment in Adult Danio rerio using a Battery of Behavioral Tests in a Single Tank
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Cited by 3 •
2023
Here, we present a comprehensive behavioral test battery, including the novel tank, Shoaling, and social preference tests, to effectively determine the potential neurotoxic effects of chemicals (e.g., methamphetamine and glyphosate) on adult zebrafish using a single tank. This method is relevant to neurotoxicity and environmental research.
FAQs
Loewe additivity and Bliss independence represent alternative expectations for how combined treatments should perform. Investigators compare the measured combination effect with one of these reference models rather than judging the result from the raw response alone. The selected benchmark influences whether the interaction is interpreted as synergistic, additive, antagonistic, or independent.
Dose-response relationships show how each treatment performs alone and how that activity changes when agents are combined. This comparison is essential because the expected combined effect depends on the individual activities of the treatments. Examining responses across doses helps distinguish a genuine interaction from an outcome that simply reflects the strength of one agent.
Interpretation can vary across cancer cell lines, treatment doses, and exposure schedules. A combination may produce different interaction patterns under different experimental conditions, so a single result may not represent every cancer model or dosing arrangement. Assessing these variables helps researchers identify where synergy, additivity, antagonism, or independence is observed.
Investigators first measure dose-response relationships for each treatment separately, then test the agents in combination across selected doses and exposure schedules. They compare the observed combination effect with an additivity model, such as Loewe additivity or Bliss independence, and classify the interaction according to its relationship with the expected effect.
Results can identify combinations whose joint activity exceeds the expected effect from the individual treatments. This information helps researchers prioritize drug pairs or multi-agent strategies for further study rather than relying only on single-agent activity. The analysis can also highlight opportunities to improve tumor control or reduce toxicity through more effective therapeutic designs.
Testing multiple cancer cell lines and exposure schedules shows whether an interaction is consistent across experimental contexts or limited to particular conditions. Such comparisons support more precise interpretation of combination effects and help researchers determine where a strategy may be most relevant. The findings can contribute to developing therapeutic approaches tailored to observed response patterns.