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Generic inhaled salbutamol versus branded salbutamol. A randomised double-blind study
I J Williamson1, A Reid, R D Monie
1Department of Respiratory Medicine, Southern General Hospital NHS Trust, Glasgow.
Postgraduate Medical Journal
|March 1, 1997
Summary
Generic salbutamol is clinically equivalent to branded Ventolin, despite patient perceptions. This study found no significant efficacy differences, suggesting careful patient guidance is needed for generic transitions.
Area of Science:
- Pharmacology
- Respiratory Medicine
- Clinical Pharmacy
Background:
- Generic substitution of salbutamol is less common in Scotland compared to other medications.
- Negative perceptions among patients and physicians may contribute to the low generic substitution rate for salbutamol.
- Understanding the clinical equivalence between branded and generic salbutamol is crucial for improving substitution rates.
Purpose of the Study:
- To evaluate the clinical efficacy of a generic salbutamol preparation compared to branded Ventolin in a real-world setting.
- To assess patient and objective measures of bronchodilator response in asthmatic patients.
Main Methods:
- A double-blind, cross-over study design was employed.
- Asthmatic patients using salbutamol metered-dose inhalers twice daily were randomized to receive Ventolin, blinded Ventolin, and generic salbutamol for two weeks each.
- Objective parameters included daily peak flows, inhaler usage, and bronchodilator response; patient-reported outcomes assessed perceived differences.
Main Results:
- No statistically significant differences were observed in objective efficacy parameters between the generic and branded salbutamol inhalers.
- A majority of patients (55%) reported being able to detect a difference between inhalers, indicating a potential disconnect between perception and objective efficacy.
- Patient perception of relief was influenced by factors beyond objective therapeutic efficacy.
Conclusions:
- The study demonstrates clinical equivalence between generic salbutamol and branded Ventolin.
- Patient subjective assessments of inhaler effectiveness may not solely reflect objective efficacy.
- Transitioning to generic salbutamol products requires careful patient counseling and encouragement, especially considering upcoming changes to inhaler formulations (e.g., CFC-free).