The Brazilian Health Surveillance Agency (ANVISA) regulates health products and services in Brazil. It oversees drug approval and registration, medical devices, food safety, tobacco and other areas. ANVISA aims to protect public health through sanitary control of production, marketing and ports of entry. It is part of the National Health Surveillance System and linked to the Ministry of Health. The registration process for new drugs involves pre-registration clinical trials, submitting documentation for approval, and post-registration monitoring and changes. ANVISA also regulates in vitro diagnostics and provides vaccination requirements for international travelers.