Omeprazole liquid formulation
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Omeprazole Liquid Formulation: Stability, Composition, and Suitability for Pediatric Use
Stability of Omeprazole Liquid Formulations
Multiple studies have shown that the stability of omeprazole in liquid formulations is highly dependent on storage conditions and the composition of the formulation. Omeprazole suspensions prepared with sodium bicarbonate as a buffering agent remain stable for up to 30 days when refrigerated at 4°C, but their stability decreases significantly at room temperature, with color changes and reduced drug content observed after 14 to 20 days at 25°C 2379. Formulations using hydroxypropyl-β-cyclodextrin (Chopin base) also demonstrated chemical stability for up to 3 months at 4°C, but only 9 days at 25°C .
Impact of Formulation Components on Stability and Quality
The inclusion of sodium bicarbonate in omeprazole suspensions is critical for maintaining drug stability, especially in acidic environments, as it buffers the solution and prevents rapid degradation of omeprazole 57. Formulations using pure omeprazole with sodium bicarbonate showed the highest drug recovery and improved stability compared to those made from crushed enteric-coated pellets . However, the choice of excipients and the source of omeprazole (capsules, tablets, or powder) can affect the physical quality of the suspension, such as uniformity and sedimentation rate. Only certain brands of omeprazole capsules (e.g., Losec and Dr. Reddy's) produced suspensions with acceptable quality and stability .
Organoleptic Characteristics and Patient Acceptability
The organoleptic properties (color, smell, taste) of omeprazole liquid formulations can change over time. Formulations made from omeprazole monohydrate salt showed significant changes in color and smell, while those made from capsules with bicarbonate maintained more stable organoleptic characteristics, though the taste was often more disagreeable (bitter or salty) . These factors are important for pediatric and geriatric patients, who may be sensitive to taste and appearance.
Modified-Release and Nanoparticle Liquid Formulations
Recent advances include the development of delayed-release liquid suspensions and nanoparticle-based formulations. Multi-layered particles suspended in syrup can protect omeprazole from acidic degradation and provide enteric release, with stability sufficient for up to 10 days at room temperature . Nanoparticle suspensions using pH-sensitive coatings have also shown promise for pediatric administration, offering effective gastric protection and improved dosing flexibility .
Clinical Implications for Pediatric and Special Populations
Liquid omeprazole formulations are especially valuable for pediatric patients and others who cannot swallow solid dosage forms. Both simple suspensions and advanced formulations (e.g., nanoparticles, delayed-release liquids) provide effective alternatives, but require careful attention to storage conditions and formulation composition to ensure stability and accurate dosing 2348+1 MORE.
Conclusion
Omeprazole liquid formulations are essential for patients unable to take solid medications, particularly children. Stability is best maintained with sodium bicarbonate as a buffer and refrigeration, with some formulations remaining stable for up to 90–150 days at 4°C. The choice of excipients, omeprazole source, and storage conditions all significantly impact the quality and effectiveness of the suspension. Newer technologies, such as delayed-release and nanoparticle suspensions, offer additional options for improving patient compliance and therapeutic outcomes.
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Most relevant research papers on this topic
3PC-046 Study of stability of two liquid formulations of omeprazole elaborated in the pharmaceutical service
The two liquid formulations of omeprazole maintained stable pH, but formulation 2 had more stable organoleptic characteristics, making it the preferred choice despite a more disagreeable taste.
Formulation and Stability Study of Omeprazole Oral Liquid Suspension for Pediatric Patients
Omeprazole oral liquid suspensions for pediatric patients are physicochemically and microbiologically stable, suitable for refrigerated storage for 150 days and room temperature for 14 days, respectively.
Stability of Omeprazole Extemporaneous Oral Solution in Chopin Base.
The extemporaneous liquid formulation of omeprazole in Chopin base is stable and suitable for all patients, particularly those unable to take other pharmaceutical dosage forms.
Comparison of 24-hour intragastric pH using four liquid formulations of lansoprazole and omeprazole.
Liquid formulations of proton-pump inhibitors can effectively maintain intragastric pH levels for healing acid-related diseases, potentially benefiting patients unable to swallow capsules.
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Stability of omeprazole in an extemporaneously prepared oral liquid.
Omeprazole 2 mg/mL in an oral liquid compounded from capsules and sodium bicarbonate injection is stable for up to 14 days at 24 degrees C and up to 30 days at 5 and -20 degrees C.
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