What are postmarketing surveillance studies?

Postmarketing surveillance studies are targeted at collecting data on the efficiency and safety of the medicament after it has been registered. The main goal of postmarketing surveillance studies is to collect information on how this medicament is prescribed as a daily treatment, and which new, previously undetected side effects can occur. A clinical research that takes place before registration and sales is different from this one in the way that it only studies the medicament within its indications and treatment regiments that correspond with the instruction