Background: Amyotrophic Lateral Sclerosis (ALS), a motor neuron disease
(MND), is a progressive neurodegenerative disorder characterized by the deterioration
of both upper and lower motor neurons. Only one drug (riluzole) has been approved
for the treatment of ALS. Riluzole is a BCS class II drug having 60% absolute
bioavailability. It is a substrate of P-glycoprotein and BBB restricts its entry in brain.
Objective: This investigation was aimed to develop O/W nanoemulsion system of
riluzole to improve its brain bioavailability.
Methods: Riluzole loaded nanoemulsion was prepared by phase titration method. It
was consisting of 3% w/w Sefsol 218, 28.3% w/w Tween 80:Carbitol (1:1) and
68.7% w/w water. It was characterized for drop size, drop size distribution, transmittance, viscosity, pH,
zeta potential, conductivity and nasal ciliotoxicity study. Thermodynamic stability and room temperature
stability of prepared nanoemulsion formulation were evaluated. Pharmacokinetic and brain uptake
study was carried out using albino rats (wistar) post intranasal and oral administration.
Results: Riluzole loaded nanoemulsion was having a drop size of 23.92±0.52 nm. It was free from nasal
ciliotoxicity and stable for three months. Brain uptake of riluzole post intranasal administration of riluzole
loaded nanoemulsion was significantly (P <4.10 × 10-6) higher when it was compared with oral
administration of riluzole loaded nanoemulsion.
Conclusion: This study indicates that nanoemulsion of riluzole for intranasal administration could be a
promising approach for the treatment of ALS to minimize the dose of riluzole in order to avoid dose related