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Summary :-

Definition - Pharmacology is comparatively new term derived from Greek words ‘Pharmacon’ ----- a drug and ‘logos’ ----- a study. It consists of detailed study of medicine, particularly their actions (harmful or beneficial) on living animals, organs or tissues.

Scope of Pharmacology : It includes the following
  1. Drug (French: Drogue - a dry herb) - It's the one active chemical entity present in an exceedingly medicine that is employed for diagnosis, prevention, treatment/cure of a disease. 
  2. Pharmacodynamics (Greek : Dynamis-power) - What the drug does to the body. It is the quantitative study of the biological and therapeutic effects of medication. Such studies also correlate the mechanism of action of a drug and will correlate the drug actions with their chemical structure.
  3. Pharmacokinetics (Greek: Kinesis-movement) - What the body does to the drug. It deals with absorption, distribution, metabolism and excretion of medication. It also deals with all processes involved within the changes of concentration of the drug within the body. The concentration of drug available at the positioning of action or in biological fluid is termed as bioavailability.
  4. Clinical Pharmacology - This branch of pharmacology deals with the study of drugs on human beings (both in volunteers and patients).
  5. Pharmacotherapeutics - It is the application of pharmacological information together with knowledge of the disease for its prevention, mitigation or cure. It consists of rational Pharmacotherapeutics and empirical Pharmacotherapeutics.