This course will review some of the basics of pharmacology, which include: routes of administration and discussion of terminology (tolerance, agonist, partial agonist, antagonist). Understanding routes of administration of substances can help clinicians assess addiction potential and other health problems, and develop harm reduction strategies for those who work in harm reduction. Knowing the difference between an agonist or antagonist or partial agonist will help people understand how some of the medication-assisted treatments work.