Disclosed in the present application is an R-
ketamine liquid preparation. The R-
ketamine liquid preparation is an
aqueous solution preparation, and comprises R-
ketamine or a pharmaceutically acceptable salt thereof, a pharmaceutically acceptable amphiphilic
excipient, and water. The liquid preparation has a pH value of 2.5-5.7. The liquid preparation of the present application is administrated through
oral mucosa, and features fast absorption, high
bioavailability, simple administration, and good compliance. The preparation of the present application can be used for preventing, relieving, or treating major depression, unipolar depression,
refractory depression, intractable depression, agitated depression, and bipolar depression.