NMR studies of sustained release methadone tablets

Area of Science:

• Pharmaceutical Sciences
• Analytical Chemistry
• Drug Delivery Systems

Background:

• Methadone is a key medication for opioid use disorder and pain management.
• Sustained-release formulations aim to improve patient compliance and therapeutic efficacy.
• Characterizing drug properties within these formulations is crucial for quality control.

Purpose of the Study:

• To identify and characterize methadone within sustained-release tablet formulations using Nuclear Magnetic Resonance (NMR) spectroscopy.
• To assess the impact of the sustained-release matrix on methadone's physicochemical properties.

Main Methods:

• Nuclear Magnetic Resonance (NMR) spectroscopy was employed to analyze methadone in sustained-release tablets.
• Specific attention was given to shifts in the N-methyl and phenyl groups of the methadone molecule.

Main Results:

• Distinct up-field shifts were observed for the N-methyl and phenyl proton signals of methadone.
• These spectral changes are indicative of alterations in the drug's chemical environment within the tablet.

Conclusions:

• The observed NMR shifts suggest an increased lipid solubility for methadone in the sustained-release formulation.
• Enhanced lipid solubility implies potentially improved drug absorptivity and bioavailability.
• NMR spectroscopy is a valuable tool for evaluating drug-excipient interactions and formulation performance.