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Kinetic model for solid-state degradation of gabapentin.

Zhixin Zong¹, Jiang Qiu, Radaduen Tinmanee

¹College of Pharmacy, University of Iowa, Iowa City, Iowa 52242, USA.

Journal of Pharmaceutical Sciences

|March 16, 2012

Summary

Mechanical stress and storage conditions impact gabapentin degradation to gabapentin-lactam (gaba-L). A new model predicts this degradation, linking manufacturing variations to chemical stability in solid-state gabapentin formulations.

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Area of Science:

Pharmaceutical Sciences
Chemical Kinetics
Solid-State Chemistry

Background:

Gabapentin undergoes degradation to gabapentin-lactam (gaba-L) in its solid form.
Understanding lactamization kinetics is crucial for predicting drug stability.
Environmental factors and mechanical stress can influence degradation pathways.

Purpose of the Study:

To develop a drug degradation model for gabapentin.
To incorporate environmental storage conditions and mechanical stress into lactamization kinetics.
To link manufacturing variations to the chemical stability of solid-state gabapentin.

Main Methods:

Mechanical stress was applied by milling gabapentin for 0 and 60 minutes.
Gabapentin powder was stored under controlled conditions (40°C-60°C, 5%-30% RH).
High-performance liquid chromatography (HPLC) was used to quantify gabapentin-lactam formation.
An irreversible two-step autocatalytic reaction scheme was fitted using nonlinear regression.

Main Results:

Mechanical stress significantly affected gabapentin degradation kinetics.
A kinetic model was successfully developed to predict gaba-L formation.
The model accurately predicted degradant concentrations in gabapentin tablets under various manufacturing conditions.

Conclusions:

The developed kinetic model effectively links manufacturing variations to chemical stability.
This model provides a valuable tool for predicting gabapentin stability in solid dosage forms.
Understanding and controlling mechanical stress and storage conditions are vital for ensuring gabapentin product quality.