1. An acceptable salt of 4-phenylbutanoic acid for the treatment of motor neuron disease or metabolic disorders, while the specified acceptable salt of 4-phenylbutanoic acid is administered rectally. 2. An acceptable salt of 4-phenylbutanoic acid for the treatment of motor neuron disease or metabolic disorders according to claim 1, wherein a therapeutically acceptable salt of 4-phenylbutanoic acid is administered in a dose in the range of 1 to 600 mg / kg / day. An acceptable salt of 4-phenylbutanoic acid for the treatment of motor neuron disease or metabolic disorders according to claim 1 or 2, wherein a therapeutically acceptable salt of 4-phenylbutanoic acid is administered 1-10 times per day. An acceptable salt of 4-phenylbutanoic acid for the treatment of motor neuron disease or metabolic disorders according to claim 1, wherein a therapeutically acceptable salt of 4-phenylbutanoic acid is administered to children suffering from motor neuron disease or metabolic disorder. An acceptable salt of 4-phenylbutanoic acid for the treatment of motor neuron disease or metabolic disorders according to claim 1, wherein a therapeutically acceptable salt of 4-phenylbutanoic acid is administered to children aged 0-5 years old suffering from motor neuron disease or metabolic disorders. An acceptable salt of 4-phenylbutanoic acid for the treatment of motor neuron disease or metabolic disorders according to claim 1, wherein a therapeutically acceptable salt of 4-phenylbutanoic acid is administered to infants suffering from motor neuron disease or metabolic disorder. An acceptable salt of 4-phenylbutanoic acid for the treatment of motor neuron disease or metabolic disorders according to claim 1, wherein said disease1. Приемлемая соль 4-фенилбутановой кислоты для лечения болезни двигательных нейронов или нарушения обмена веществ, при этом указанная приемлемая соль 4-фенилбутановой кислоты вводится ректально.2. Приемлемая соль 4-фенилбутановой кислоты для лечения болезни двигательн
