Physically and chemically stable aqueous oral suspensions of riluzole and manufacturing methods thereof. The suspensions contain riluzole in particle form and at least a wetting agent, preferably a surfactant. Riluzole is present in amounts from about 0.1% to about 20% w/v and has an average particle size lower than 200 μm. The suspensions are devoid of the known local (mouth) anaesthetic effects of riluzole.