Publications, Pharmaceutical

Nasal Spray Orientation & Sumatriptan Exposure using PK Modelling

Advancements in drug technology design and formulation are increasingly leveraging in vitro testing and computational methods to generate specific product profiles for optimization. In this study, the combination of nasal cast deposition with a physiologically based pharmacokinetic (PBPK) model enabled a better understanding of relationships between the drug delivery system angle, depth, nasal deposition pattern, and systemic pharmacokinetics. The test substances, nasal solutions of fluorescein sodium, were filled into three nasal spray systems, and the deposition of these solutions in an Aptar Aeronose™ cast was analyzed at various angles and depths.

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Author(s): Will Ganley Niall Doherty Jessica Lavabre Micas Lila Graine Manon Sautreuil Gonçalo Farias
3 Jul 2023

The Aeronose™ cast is a 3D printed replica of an adult Caucasian male’s nasal cavity, segmented into distinct regions. The solutions sprayed into the cast were then separated and quantified using a spectrophotometer. This in vitro data was used to predict systemic pharmacokinetics of a nasally administered drug – sumatriptan, using a PBPK model that mapped the entire process of drug absorption and clearance.

The model followed standard PBPK frameworks, representing orally inhaled and nasal administration and was parameterized using standard literature sources. With the help of Python and SciPy, the PBPK model equations were solved and a principal component analysis was conducted to further comprehend the relations between deposition patterns and systemic pharmacokinetics.

The results, quite strikingly, demonstrated that the vertical angle of drug administration significantly influenced the maximum plasma concentrations of the drug, with the optimal angle found to be 35°. Moreover, a strong correlation between the deposition of the drug on the turbinates and floor of the nasal cavity, and the systemic pharmacokinetics of the drug was observed.

In conclusion, this in vitro/in silico approach has the potential to provide specific targets and understanding to maximize systemic exposure of drugs delivered through nasal spray systems. It underscored the importance of certain nasal regions like the turbinates and floor for systemic drug delivery, considering factors such as surface areas, tissue depths, and blood flows to various nasal regions. This method could lead to enhanced drug delivery systems with an in-depth understanding of why specific targets apply.

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