Neurological disorders such as Alzheimer's disease, Parkinson's disease, dementia, epilepsy, depression, migraine etc. are affecting more and more elderly people's day by day. Conventional route of administration to treat these diseases has to face a major hindrance that is blood brain and blood- (CSF) barrier to achieve desired concentration of drug at the site of action for therapeutic effect. Hence, intranasal route of delivery is considered as promising and alternative route to achieve desired goals. In last four decades, brain targeting strategies are widely studied and considered having great potential by researchers; especially intranasal delivery owing to its benefits. Various nano formulations such as nanoemulsions, nanosuspensions, hydrogels, in situ gels, dendrimers and lipidic formulations are studied widely. Lipid nano formulations especially second generation nanostructured lipid carriers offer greater advantages in terms of stability, fabrication techniques, scalability, drug loading and drug targeting. Nanostructured lipid carrier (NLCs) constitute of two major components viz solid lipid and liquid lipid in a specific ratio. In this review, authors have discussed about the possible synergistic actions of oils/liquid lipids with synthetic drugs resulting into great therapeutic benefits.
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