去甲肾上腺素注射液1ml:2mg， 配成0.01%，怎么配？

假设需稀释倍数为X，目标浓度0.01%即10mg/100ml即0.1，初始浓度为2mg/ml即2 2 / X =0.1 X = 20 即需要稀释20倍 1支1ml去甲注射液（2mg）+19ml生理盐水=0.002g/20ml=0.0001g/ml=0.01g/100ml=0.01% 换种方式理解 5支1ml去甲注射液（2mg*5=10mg）+95ml生理盐水=0.01g/100ml=0.01% 注：关键问题在于 % (