incompatibility

这款新药与某些常见药物存在配伍禁忌。

This new medication has ___incompatibility with some common drugs.

软件版本的不兼容导致系统频繁崩溃。

The ___incompatibility between software versions caused frequent system crashes.

医生发现药物之间存在不相容性，不能同时服用。

The doctor found an ___incompatibility between the two medications, so they can't be taken together.