An anti-inflammatory injectable solution is prepared from Symphytum officinale roots by cutting and drying of the vegetal material; calcining it at a temperature of 550-600.degree. C., over a period of 3 to 4 hours; dissolving the ash obtained in distilled water at a ratio of 1:100 to form a solution, the obtained solution is filtered under vacuum, followed by filtration through milipor or semper filters to produce a filtrate and the filtrate is subjected to boiling evaporation to produce a liquid having a viscosity of 6.57.+-.0.5 cP; and then drying a thin layer of the liquid so producedat a temperature of 200-250.degree. C., over a period of 5-15 minutes until a white powder is obtained; and thereafter dissolving said white powder in distilled water in amount of 1 to 700 mg to 100 ml distilled water or saline solution.