Abstract
Purpose
Rufinamide is an anti-epileptic drug approved for use in children ≥ 4 years of age and in adults. It is marketed as Banzel in the USA. In 2015, Banzel received approval for use in pediatric patients (1–4 years of age) and the patent for which expires in 2023. It suffers from poor oral bioavailability, and hence, small amounts of the drug reach the brain. This has led to high and frequent dosage administration of rufinamide. This work aims to improve its brain bioavailability by formulating a nasal thermosensitive in situ gel using xyloglucan.
Methods
The formulation was optimized using rheometric analysis, texture analysis, in vitro, and in vivo studies. Pharmacokinetic studies in rats were carried out to assess direct nose to brain uptake for the optimized in situ gelling formulation of rufinamide and compared with intravenous bolus and aqueous nasal suspension of rufinamide. Finally, brain targeting indices % DTE, and % DTP were calculated.
Results
All the formulations showed gelation below 35 °C. The final formulation comprised 2.0% w/v xyloglucan, 0.01% v/v thiomersal (preservative), and rufinamide in suspended form. The %DTE values for the in-situ gel formulation and aqueous suspension were 1069.94 and 146.88, and the %DTP values were 90.65 and 31.91, respectively.
Conclusion
This work demonstrated the superiority of the nasal gel formulation over oral formulation of rufinamide. If translated to humans, this would definitely help patients suffering from epilepsy, especially pediatric population, in whose case, a high dose and frequent dosage administration via oral route is inconvenient.
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Acknowledgements
Avantika Vijay Dalvi thanks the Indian Council of Medical Research for awarding a Senior Research Fellowship to pursue her doctoral studies. The authors thank the Central Analytical Laboratory of BITS-Pilani, Hyderabad campus, for providing Rheometer facilities.
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Avantika Vijay Dalvi, Chandra Teja Uppuluri, Radhika Rajiv Mahajan, Sumeet Vaibhav Katke, Vibha Sanjay Deshpande, and Punna Rao Ravi declare that they have no conflict of interest.
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All procedures performed in studies involving animals were in accordance with the ethical standards of the institution at which the studies were conducted, and ethical approval was obtained from the institute animal ethics committee (IAEC), BITS-Pilani, Hyderabad Campus (Regn. No.: 1912/PO/RE/S/16/CPCSEA).
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Dalvi, A.V., Ravi, P.R., Uppuluri, C.T. et al. Thermosensitive nasal in situ gelling systems of rufinamide formulated using modified tamarind seed xyloglucan for direct nose-to-brain delivery: design, physical characterization, and in vivo evaluation. J. Pharm. Investig. 51, 199–211 (2021). https://doi.org/10.1007/s40005-020-00505-9
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DOI: https://doi.org/10.1007/s40005-020-00505-9