Centre County, PA - Official Website - MH/ ID/EI -...The Centre County Mental Health/Intellectual Disabilities/Early Intervention and Drug & Alcohol Offices have relocated to: Summit Park 3500 E College Ave, Suite 1200 Serotonin receptor agonist - Wikipedia, the free...A serotonin receptor agonist is a compound that activates serotonin receptors, in a manner similar to serotonin.