Pharmacology is the study of drugs, where a drug can be broadly defined as any man-made, natural, or endogenous (from within body) and they relate with other molecule in the body and how they affect the body which exerts a biochemical or physiological effect on the cell, tissue, organ, or organism (sometimes the word pharmacon is used as a term to include these endogenous and exogenous   bioactive type . This field of study can be broken down into two smaller pieces: pharmacokinetics and pharmacodynamics.
•   Sedative hypnotic addiction
•   Opioid dependence
•   Cocaine, methamphetamine 
•   Alcohol rehabilitation
•   Opioid maintenance treatment