Jason has been extremely busy recently updating and improving his excellent drug database. He unfortunately had a run in with those pleasant people who roll out the British National Formulary (BNF) and his database has had to be altered. His new abbreviated database now includes a section on mechanisms of action. Unfortunately it does not include data on side-effects or cautions.
The good news is that Jason maintains the full version for his own use and if you would like to commiserate Jason or just find out more I would suggest you email him. The other excellent piece of news is that the databases are available in both S3a/c and S5 formats. If you are using his databases please let him know as this is 'registerware' and he would like to know who is using it.
An example
Series 3 
Series 5