Background: Flunarizine dihydrochloride (FHC) is used for the prophylaxis to
migraine. Flunarizine has solubility problems which is practically insoluble in water and alcohol.
Nanoemulsion is the approach to increase the solubility of the insoluble drugs.
Nanoemulsions of FHC was prepared which can be given through the alternate route such as
nasal drug delivery for migraine.
Objective: In this research work the solubility of the poorly soluble FHC was successfully
improved by preparing it as a nano emulsion. Nanoemulsions can pass through the biological
membrane easily so it can be delivered through nasal mucosa by which it may provide a
quicker onset of action. The currently available dosage forms are in the form of tablet.
Methods: The formulations were prepared by using Glycerl Monostearate (GMS), Tween
80 as surfactant and PEG 400: Ethanol as co-surfactant in the distilled water. Nanoemulsions
were prepared by step by step procedure. The prepared nanoemulsions were analyzed
preliminarily by Master Sizer followed by Zeta Sizer by using the technique Dynamic Photon
Correlation Spectroscopy. The best nanoemulsion was subjected to Zeta Potential study.
The TEM analysis was carried out on the best formulation to gain the detailed information
about the formulation.
Results: The best formulation was selected based on the physical appearance, homogenecity
of the preparation, Preliminary Master Sizer analysis report, Secondary Zeta Sizer analysis
report with Zeta Potential and TEM. The best formulation demonstrated the size in nano
range with improved solubility.
Conclusion: The FHC nano emulsion was prepared successfully which improved the solubility
of the drug. The drug release study on simulated nasal fluid revealed that the preparation
is suitable to be delivered through the nasal route.