Endogenous catecholamines-ep i nephr i ne Adrenal in 【properties】 a.Unstable in alkaline solution b. Not effective after oral administration. C.Absorption from subcutaneous tissue occurs relatively slowly and the rate may be further decreased.1:10000(0.1 mg/ml) d.Absorption is more rapid after intramuscular injection. e.In emergency,it may be necessary to administer epinephrine intravenously f.Rapidly inactivated in the body.Liver is important organ because it is rich in COMT and MAO.Adrenalin 【properties】 a. Unstable in alkaline solution b. Not effective after oral administration. c. Absorption from subcutaneous tissue occurs relatively slowly and the rate may be further decreased. 1:10000(0.1 mg/ml) d. Absorption is more rapid after intramuscular injection. e. In emergency, it may be necessary to administer epinephrine intravenously f. Rapidly inactivated in the body. Liver is important organ because it is rich in COMT and MAO. Endogenous catecholamines-- epinephrine