Abstract: The invention relates to a neurodegenerative disease treating agent for parenteral use, which comprises (2R)-2-propyloctanoic acid or a salt thereof. Since the neurodegenerative disease treating agent of the present invention comprising (2R)-2-propyloctanoic acid or a salt thereof, characterized in that a dosage exceeding about 100 mg per dose is parenterally administered, shows neuropathy improving effect and S-100? increase inhibiting effect in patients with cerebral infarction, it is useful for the treatment of neurodegenerative diseases including cerebral infarction. In addition, it is also useful as a neural regeneration agent after transplantation.

Abstract: An agent for treating acute cerebral infarction, comprising (2R)-2-propyloctanoic acid or a salt thereof, which is used for administration after a lapse of time of from about 5 hours to about 72 hours from the onset of the disease is useful for treating acute cerebral infarction, since it safely improves acute cerebral infarction or accompanying symptoms in the patient of acute cerebral infarction, specifically in the patient of acute cerebral infarction defined as a score of 7 to 22 on NIH Stroke Scale.

Abstract: The present invention relates to an agent for protecting a motor nerve of a patient with amyotrophic lateral sclerosis, which comprises a combination of (a) (2R)-2-propyloctanoic acid or a salt thereof and (b) a therapeutic agent for amyotrophic lateral sclerosis such as riluzole. An agent comprising a combination of (a) (2R)-2-propyloctanoic acid which is orally administered once a day in an amount per dose of about 1200 mg and (b) riluzole which is orally administered twice a day in an amount per dose of about 50 mg is useful for protecting a motor nerve in a patient(s) with amyotrophic lateral sclerosis. The agent can also suppress the respiratory disability associated with the progression of the disease condition and improve the survival rate of the patient(s).

Abstract: The invention relates to a neurodegenerative disease treating agent for parenteral use, which comprises (2R)-2-propyloctanoic acid or a salt thereof. Since the neurodegenerative disease treating agent of the present invention comprising (2R)-2-propyloctanoic acid or a salt thereof, characterized in that a dosage exceeding about 100 mg per dose is parenterally administered, shows neuropathy improving effect and S-100 ? increase inhibiting effect in patients with cerebral infarction, it is useful for the treatment of neurodegenerative diseases including cerebral infarction. In addition, it is also useful as a neural regeneration agent after transplantation.