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Solid-state study of polymorphic drugs: carbamazepine.

C Rustichelli¹, G Gamberini, V Ferioli

¹Dipartimento di Scienze Farmaceutiche, Università di Modena e Reggio Emilia, Italy.

Journal of Pharmaceutical and Biomedical Analysis

|July 18, 2000

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This study identified three distinct polymorphic forms of carbamazepine, an anticonvulsant drug. Understanding these solid-state differences is crucial for pharmaceutical development and clinical efficacy.

Area of Science:

Solid-state chemistry
Pharmaceutical sciences
Materials science

Background:

Polymorphism significantly impacts drug bioavailability and clinical effectiveness.
Carbamazepine is a widely used anticonvulsant drug.
Understanding carbamazepine's polymorphic forms is essential for its pharmaceutical application.

Purpose of the Study:

To obtain and characterize different polymorphic modifications of carbamazepine.
To investigate the solid-state properties of carbamazepine polymorphs.
To evaluate the utility of Hot Stage FT-IR thermomicroscopy for polymorphism analysis.

Main Methods:

Fourier Transform Infrared (FT-IR) spectroscopy
X-ray Powder Diffraction (XRPD)
Differential Scanning Calorimetry (DSC)

Related Experiment Videos

Hot Stage FT-IR thermomicroscopy

Main Results:

Three anhydrous polymorphic forms of carbamazepine were identified: Form III (commercial), Form I (from heating Form III), and Form II (from ethanol crystallization).
Significant differences in solid-state properties were observed among the identified polymorphs.
Hot Stage FT-IR thermomicroscopy effectively characterized the polymorphic forms during heating.

Conclusions:

The study confirmed three distinct polymorphic forms of carbamazepine.
Polymorphism influences the solid-state properties of carbamazepine.
Hot Stage FT-IR thermomicroscopy is a valuable tool for characterizing drug polymorphism.