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Updated: Feb 22, 2026

Diagonal Method to Measure Synergy Among Any Number of Drugs
Published on: June 21, 2018
[For an optimal use of fixed drug combinations]
Gilles Bouvenot1, Jean Sassard2, Jean-Louis Montastruc3
1Service de médecine interne, gériatrie et thérapeutique, hôpital Sainte-Marguerite, faculté de médecine de Marseille, 270, boulevard de Sainte-Marguerite, 13009 Marseille, France.
Fixed-dose combination therapy (FC) offers benefits like improved patient compliance but has drawbacks such as limited flexibility. Careful consideration and regular reassessment are crucial, especially for elderly patients with multiple conditions.
Area of Science:
- Pharmacology and Therapeutics
- Clinical Pharmacy Practice
Background:
- Increasing utilization of fixed-dose combination (FC) therapies across various pathological conditions.
- Need to evaluate the comparative advantages and disadvantages of FC versus free drug combinations.
Purpose of the Study:
- To analyze the benefits and drawbacks of fixed-dose combination therapy.
- To compare FC with free drug combinations regarding drug intake simplification, compliance, and dosage flexibility.
- To propose recommendations for the optimal use of FC.
Main Methods:
- Discussion and comparative analysis of existing literature on fixed-dose combination therapies.
- Evaluation of advantages including simplified drug intake, improved compliance, and rational drug associations.
- Assessment of disadvantages such as limited dosage flexibility and potential misunderstanding of International Nonproprietary Names (INN).
Main Results:
- FC simplifies drug intake and can enhance patient compliance.
- FC presents limitations in dosage flexibility and may obscure individual drug recognition.
- Free drug combinations offer greater flexibility but may lead to lower compliance.
Conclusions:
- FC is generally suitable for young adults with stable diseases.
- Cautious prescription of FC is recommended for elderly patients and those with multiple comorbidities.
- FC should be initiated after separate component titration and undergo regular reassessment.
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