Benzodiazepines are a class of compounds that have two structural features in common and one pharmacological action in common. The structural features are:
- A diazepine group
- Two benzene rings
See figure below.
The pharmacological action they have in common is that they all serve as positive allosteric modulators at the GABAA receptor. They do this by binding to the benzodiazepine site on the the aforementioned receptor.