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Record W2120418986 · doi:10.4212/cjhp.v64i3.1024

Stability of Levetiracetam in Extemporaneously Compounded Suspensions

2011· article· en· W2120418986 on OpenAlexaffvenueabout
Mary H. H. Ensom, Diane Décarie, Susan Rudolph

Bibliographic record

VenueThe Canadian Journal of Hospital Pharmacy · 2011
Typearticle
Languageen
FieldMedicine
TopicPharmaceutical studies and practices
Canadian institutionsChildren's & Women's Health Centre of British ColumbiaUniversity of British Columbia
Fundersnot available
KeywordsLevetiracetamChromatographyChemistryMedicineBottleAnesthesiaEpilepsyMaterials science

Abstract

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Background: Levetiracetam is widely used as adjunctive therapy in the treatment of partial-onset seizures, myoclonic seizures, primary generalized tonic-clonic seizures, and idiopathic generalized epilepsy in the community and in hospital. However, no convenient, easy-to-swallow dosage form is commercially available in Canada. Moreover, no stability data are available for this antiepileptic prepared in a vehicle combining Ora-Sweet sweetener and Ora-Plus suspending agent.Objective: To evaluate the stability of levetiracetam suspensions in amber plastic bottles at room temperature and under refrigeration for up to 91 days.Methods: Suspensions of levetiracetam (50 mg/mL) were prepared in a 1:1 mixture of Ora-Sweet sweetening agent and Ora-Plus suspending agent. The suspensions were transferred to 50-mL amber plastic prescription bottles, which were stored at 25°C or at 4°C. Samples were collected from each bottle at time zero and on days 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, and 91. The samples were analyzed in triplicate by a validated, stability-indicating high-performance liquid chromatography method with ultraviolet detection. A suspension was considered stable if it maintained at least 90% of its initial concentration of levetiracetam. Colour, odour, taste, clarity, and pH were assessed to determine physical compatibility.Results: All samples remained physically unchanged over time, and there was no significant change in pH. The 95% confidence interval of the slope of the curve relating concentration to time, determined by linear regression, indicated that suspensions stored at 25°C would maintain at least 91.4% of the initial levetiracetam concentration for 91 days and that suspensions stored at 4°C would maintain at least 93.2% of the initial concentration for 91 days, with 95% confidence.Conclusion: Levetiracetam suspensions prepared in Ora-Sweet/Ora-Plus vehicle and stored in plastic prescription bottles at either 25°C or 4°C can be expected to remain stable for 91 days.RÉSUMÉContexte : Le lévétiracétam est largement utilisé comme traitement d'appoint dans le traitement des crises partielles, des crises myocloniques, des crises tonico-cloniques généralisées primaires et de l'épilepsie généralisée idiopathique dans la communauté et dans les hôpitaux. Cependant, il n'existe aucune forme pharmaceutique pratique et facile à avaler au Canada. En outre, il n'y a aucune donnée disponible sur la stabilité de cet antiépileptique préparé dans un excipient combinant l'édulcorant Ora-Sweet et l'agent de suspension Ora-Plus.Objectif : Évaluer la stabilité de suspensions de lévétiracétam conditionnées dans des flacons en plastique ambré et conservées à la température ambiante et au réfrigérateur pendant un maximum de 91 jours. Méthodes : Des suspensions de lévétiracétam (50 mg/mL) ont été préparées dans un mélange 1 : 1 d'Ora-Sweet (édulcorant) et d'Ora-Plus (agent de suspension). Les suspensions ont été transférées dans des flacons pour médicaments d'ordonnance en plastique ambré de 50 mL puis entreposées à une température de 25 °C ou de 4 °C. Des échantillons ont été prélevés de chaque flacon au temps zéro puis aux jours 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84 et 91. Les échantillons ont été analysés en triple à l'aide d'une épreuve validée par chromatographie liquide haute performance avec détection ultraviolette mesurant la stabilité. La suspension était considérée comme stable si elle conservait au moins 90 % de la concentration initiale de lévétiracétam. La compatibilité physique des suspensions de lévétiracétam a été évaluée en contrôlant tout changement dans la couleur, l'odeur, le goût, la limpidité et le pH des préparations. Résultats : Aucun changement des propriétés physiques ni aucun changement significatif du pH des suspensions n'ont été observés dans le temps. L'intervalle de confiance à 95 % de la pente de la courbe de la concentration en fonction du temps, déterminée par régression linéaire, a montré que les suspensions de lévétiracétam entreposées à 25 °C conserveraient au moins 91,4 % de la concentration initiale de lévétiracétam pendant 91 jours et que les suspensions entreposées à 4 °C conserveraient au moins 93,2 % de la concentration initiale de lévétiracétam pendant 91 jours, avec un niveau de confiance de 95 %. Conclusion : Les suspensions de lévétiracétam préparées dans un excipient composé d'Ora-Sweet et d'Ora-Plus, puis conditionnées dans des flacons pour médicaments d'ordonnance en plastique et entreposées à 25 °C ou à 4 °C devraient demeurer stables pendant 91 jours.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.001
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesInsufficient payload (model declined to judge)
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: Observational
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.198
Threshold uncertainty score1.000

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0010.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.001
Insufficient payload (model declined to judge)0.0010.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.164
GPT teacher head0.353
Teacher spread0.189 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one teacher head, not a consensus.

Study designObservational
Domainnot available
GenreEmpirical

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

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Citations7
Published2011
Admission routes3
Has abstractyes

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