Clinical pharmacology studies how medications act in the human body. It has several key areas of focus: pharmacodynamics examines the effects of drugs and their mechanisms of action; pharmacokinetics studies how the body absorbs, distributes, metabolizes and eliminates drugs. Pharmacogenetics explores genetic factors influencing individual responses to medications. Receptors play an important role in how drugs produce their effects, and drugs can act through different receptor types or mechanisms to produce their intended or side effects.