Z-Index B. V.  maintains and updates the G-Standaard, the Dutch drug database which is used by all parties in healthcare in the Netherlands. The G-Standaard contains all the products that are dispensed by or used in the pharmacy. It enables an efficient exchange of information between healthcare parties.
Z-Index acts as an intermediary, keeping all the information in the G-Standaard up to date and making it accessible to end users through software houses. To this end, it has contacts with manufacturers, wholesalers, scientific institutes, registration authorities, and the government. These parties can be providers of data in the G-Standaard as well as users of this data.

The pharmacotherapeutic information in the G-Standaard is provided by the Medicines Information Centre of the Royal Dutch Pharmacists Association (KNMP).