Rats with model cerebral ischemia were treated over 5 days with acetylsalicylic acid (in a single daily dose of 50 mg/kg via a gastric tube). This treatment decreased the level of platelet aggregation, while producing no statistically significant effect upon hemorheogical indices. The combined treatment with a complex of acetylsalicylic acid and diquertin (50 and 10 mg/kg via a gastric tube, respectively) also produced the antiaggregant effect, but additionally reduced the blood viscosity, erythrocyte aggregation, and fibrinogen content in the blood plasma.