Breadcrumb Home Information & Resources Opioid Overdose Prevention Project This Is What Happens to Your Brain on Opioids This Is What Happens to Your Brain on Opioids This Is What Happens to Your Brain on Opioids Watch External Video* *By clicking on the “Watch External Video” button, you will leave this website, enter a non-County of Santa Clara website, and be subject to the destination website’s privacy policy. Please see our Links Policy for more information.