Related Experiment Video
Updated: Jan 5, 2026
12:08
Diagonal Method to Measure Synergy Among Any Number of Drugs
Published on: June 21, 2018
19.4K
You Cannot Have Your Synergy and Efficacy Too
Pramita Sen1, Ananya Saha1, Narendra M Dixit2
1Department of Chemical Engineering, Indian Institute of Science, Bangalore, India.
Trends in Pharmacological Sciences
|October 16, 2019
Summary
Maximizing drug synergy in combination therapies can reduce treatment efficacy. This trade-off is common in viral infections and cancers, suggesting new screening methods are needed for optimal drug combinations.
Area of Science:
- Pharmacology
- Drug Discovery
- Computational Biology
Background:
- Combination therapies are crucial for treating complex diseases like viral infections and cancers.
- Synergistic drug interactions are highly sought after to enhance therapeutic outcomes.
- Current methods often prioritize maximizing synergy without fully assessing potential efficacy costs.
Purpose of the Study:
- To investigate the prevalent trade-off between drug synergy and treatment efficacy in combination therapies.
- To highlight the implications of this trade-off for optimizing drug combination screening.
- To provide examples of this phenomenon in existing therapeutic areas.
Main Methods:
- Review and analysis of existing drug combination data from hepatitis C, HIV, and cancer treatment regimens.
- Identification of patterns demonstrating a correlation between high synergy levels and reduced efficacy.
- Conceptual framework development for incorporating the synergy-efficacy trade-off into screening protocols.
Main Results:
- A widespread synergy-efficacy trade-off was observed across diverse drug combinations and disease models.
- This trade-off appears to be independent of the specific mechanisms driving drug synergy.
- Examples from hepatitis C, HIV, and cancer therapies illustrate the practical implications of this finding.
Conclusions:
- The pursuit of maximum synergy in drug combinations may inadvertently compromise overall treatment efficacy.
- Drug screening strategies should be refined to account for the synergy-efficacy trade-off for improved therapeutic outcomes.
- Considering this trade-off can lead to more effective and robust combination therapies for various diseases.
More Related Videos
Related Concept Videos
01:22Dose-Response Relationship: Potency and Efficacy
6.2K
The potency of a drug is the measure of its ability to produce a biological response and can be compared by looking at the half-maximum effective concentration or EC50 values of different drugs. A lower EC50 value indicates higher potency of the drug. In the dose–response curve of two antihypertensive drugs, candesartan and irbesartan, a significant difference is observed in their EC50 values. A lower EC50 value for candesartan indicates that it is more potent than irbesartan, as it...
6.2K
01:27Combined Effects of Drugs: Synergism
6.7K
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...
Such synergistic combinations...
6.7K
01:14Agonism and Antagonism: Quantification
927
When drugs are administered, they can elicit either an agonist or antagonist effect on the body. Agonism occurs when a drug activates a specific receptor, triggering a biological response. On the other hand, antagonism happens when a drug binds to the same receptors but blocks their activation, thereby preventing a biological response.
To quantify these effects, researchers use a dose-response curve, which provides valuable information about the potency and efficacy of a drug. Potency refers to...
To quantify these effects, researchers use a dose-response curve, which provides valuable information about the potency and efficacy of a drug. Potency refers to...
927
01:30Combined Effects of Drugs: Antagonism
11.4K
The combined effects of drugs can result in various interactions, of which an important type is antagonism. Antagonism is a mechanism where one drug inhibits or counteracts the effects of another drug. Antagonism can occur through various means, including receptor binding, allosteric modulation, functional interaction, chemical reactions, and pharmacokinetic processes.
The most common type is receptor antagonism, where one drug acts as an antagonist to block the effects of another drug by...
The most common type is receptor antagonism, where one drug acts as an antagonist to block the effects of another drug by...
11.4K
01:09Bioequivalence of Drugs: Drugs with Multiple Indications
131
The concept of therapeutic equivalence (TE) in drugs with multiple indications is complex. A generic drug may be therapeutically equivalent to a brand-name product for one specific indication, but this doesn't necessarily mean it's equivalent for all other indications. Evidence of TE in one patient group and bioequivalence shown in healthy volunteers can support—but not confirm—TE for other indications. However, definitive proof requires individual clinical studies for each...
131
01:20Desensitization and Tachyphylaxis
2.9K
Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
2.9K