[Generic substitution in primary care in 2011: differences according to pharmacological classes?]

Area of Science:

• Pharmacoeconomics
• Drug Utilization Research

Context:

• France promotes generic substitution to reduce healthcare expenditure.
• Reluctance towards generic drugs stems from concerns about efficacy, safety, excipients, and bioequivalence.

Purpose:

• To analyze generic substitution ratios across different pharmacological classes in primary care.
• To identify variations in generic drug uptake based on drug type.

Summary:

• A descriptive study of French health insurance data (2010-2011) revealed a global generic substitution ratio of 72.32%.
• Significant differences were observed, with substitution rates ranging from 28.36% for thyroid hormones to 90.39% for antibiotics (P<0.001).
• Low substitution (<50%) was noted for thyroid hormones and antiepileptics, while high rates (>85%) were seen for PPIs, statins, antidepressants, and diuretics.

Impact:

• Highlights substantial inter-class variability in generic substitution, potentially influenced by clinical guidelines.
• Suggests a need for further research into patient, prescriber, and pharmacist perspectives on generic drug use.