药物为什么要求输注时间

㈠ 输液给药为什么要慢滴，不良反应是什么

不是所有的输液药要慢滴。比如头孢类的抗菌素，滴的时间不能太长了。否则达不到血液的有效浓度。
在些情况下慢滴是因为：1、不致引起血容量短时间增加，造成心负荷加重。2、某些对血管刺激性的药物，避免反应过大。
输液的不良反应过多，最常见的是输液反应，可由液体中的致热原等引起，出现心悸，发热，头痛、出汗等，
还有就是药物本身副作用，如甲硝唑的胃肠道反应。
还有就是过敏反应。

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㈢ 输液的药对好后几个小时内必须输完

开启加好的 一般4小时

但也有特殊药物 有维持24小时都有的