The agent with antistress, anxiolytic and antidepressant activity and a composition based on it. The invention relates to the field of pharmaceutics, particularly to chemical compounds based on lithium salts, namely to substances with antistress, anxiolytic and antidepressant activity and can be used in medicine, veterinary medicine, and the pharmaceutical industry. The invention discovers the possibility of using lithium ascorbate as an agent with antistress, anxiolytic and antidepressant activity. The claimed composition with antistress, anxiolytic and antidepressant activity, including a lithium salt, contains pyridoxine hydrochloride, thiamine mononitrate and lithium ascorbate as a lithium salt. The use of lithium ascorbate as an agent with antistress, anxiolytic and antidepressant action and the composition based on it, enables to expand the assortment of the agents for indicated administration. At the same time, the claimed agents have low toxicity and high efficacy.