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Pharmacology
From Wikipedia, the free encyclopedia


Pharmacology
 (from Greek φάρμακον, pharmakon, "poison" in classic Greek; "drug" in modern Greek; and -λογία, -logia "study of", "knowledge of") is the branch of medicine and biology concerned with the study of drug action, where a drug can be broadly defined as any man-made, natural, or endogenous (within the body) molecule which exerts a biochemical and/or physiological effect on the cell, tissue, organ, or organism (sometimes the word pharmacon is used as a term to encompass these endogenous and exogenous bioactive species). More specifically, it is the study of the interactions that occur between a living organism and chemicals that affect normal or abnormal biochemical function. If substances have medicinal properties, they are considered pharmaceuticals.

The field encompasses drug composition and properties, synthesis and drug design, molecular and cellular mechanisms, organ/systems mechanisms, signal transduction/cellular communication, molecular diagnostics,interactions, toxicology, chemical biology, therapy, and medical applications and antipathogenic capabilities. The two main areas of pharmacology are pharmacodynamics and pharmacokinetics. The former studies the effects of the drug on biological systems, and the latter the effects of biological systems on the drug. In broad terms, pharmacodynamics discusses the chemicals with biological receptors, and pharmacokinetics discusses the absorption, distribution, metabolism, and excretion (ADME) of chemicals from the biological systems. Pharmacology is not synonymous with pharmacy and the two terms are frequently confused. Pharmacology, a biomedical science, deals with the research, discovery, and characterization of chemicals which show biological effects and the elucidation of cellular and organismal function in relation to these chemicals. In contrast, pharmacy, a health services profession, is concerned with application of the principles learned from pharmacology in its clinical settings; whether it be in a dispensing or clinical care role. In either field, the primary contrast between the two are their distinctions between direct-patient care, for pharmacy practice, and the science-oriented research field, driven by pharmacology.

The origins of clinical pharmacology date back to the Middle Ages in Avicenna's The Canon of Medicine, Peter of Spain's Commentary on Isaac, and John of St Amand's Commentary on the Antedotary of Nicholas. Clinical pharmacology owes much of its foundation to the work of William Withering.  Pharmacology as a scientific discipline did not further advance until the mid-19th century amid the great biomedical resurgence of that period. Before the second half of the nineteenth century, the remarkable potency and specificity of the actions of drugs such as morphine, quinine and digitalis were explained vaguely and with reference to extraordinary chemical powers and affinities to certain organs or tissues.  The first pharmacology department was set up by Rudolf Buchheim in 1847, in recognition of the need to understand how therapeutic drugs and poisons produced their effects.

Early pharmacologists focused on natural substances, mainly plant extracts. Pharmacology developed in the 19th century as a biomedical science that applied the principles of scientific experimentation to therapeutic contexts.
Today Pharmacologists harness the power of genetics, molecular biology, chemistry, and other advanced tools to transform information about molecular mechanisms and targets into therapies directed against disease, defects or pathogens, and create methods for preventative care, diagnostics, and ultimately personalized medicine.


Contents  
  • 1 Divisions
    • 1.1 Clinical pharmacology
    • 1.2 Neuropharmacology
    • 1.3 Psychopharmacology
    • 1.4 Pharmacogenetics
    • 1.5 Pharmacogenomics
    • 1.6 Pharmacoepidemiology
    • 1.7 Toxicology
    • 1.8 Theoretical pharmacology
    • 1.9 Posology
    • 1.10 Pharmacognosy
    • 1.11 Behavioral pharmacology
    • 1.12 Environmental pharmacology
  • 2 Scientific background
  • 3 Medicine development and safety testing
  • 4 Drug legislation and safety
  • 5 Education
  • 6 See also
  • 7 Notes and references
  • 8 External links

Clinical pharmacology
From Wikipedia, the free encyclopedia


Clinical pharmacology
 is the science of drugs and their clinical use. It is underpinned by the basic science of pharmacology, with added focus on the application of pharmacological principles and methods in the real world. It has a broad scope, from the discovery of new target molecules, to the effects of drug usage in whole populations.

Clinical pharmacology connects the gap between medical practice and laboratory science. The main objective is to promote the safety of prescription, maximise the drug effects and minimise the side effects. It is important that there be association with pharmacists skilled in areas of drug information, medication safety and other aspects of pharmacy practice related to clinical pharmacology.

Clinical pharmacologists usually have a rigorous medical and scientific training which enables them to evaluate evidence and produce new data through well designed studies. Clinical pharmacologists must have access to enough outpatients for clinical care, teaching and education, and research as well be supervised by medical specialists. Their responsibilities to patients include, but are not limited to analyzing adverse drug effects, therapeutics, and toxicology including reproductive toxicology, cardiovascular risks, perioperative drug management and psychopharmacology.

In addition, the application of genetic, biochemical, or virotherapeutical techniques has led to a clear appreciation of the mechanisms involved in drug action.


Branches[
  • Pharmacodynamics - finding out what drugs do to the body and how. This includes not just the cellular and molecular aspects, but also more relevant clinical measurements. For example, not just the biology of salbutamol, a beta2-adrenergic receptor agonist, but the peak flow rate of both healthy volunteers and real patients.
  • Pharmacokinetics - what happens to the drug while in the body. This involves the body systems for handling the drug, usually divided into the following classification:
    • Absorption
    • Distribution
    • Metabolism
    • Excretion.
  • Rational Prescribing - using the right medication, at the right dose, using the right route and frequency of administration for the patient, and stopping the drug appropriately.
  • Adverse Drug Effects
  • Toxicology
  • Drug interactions
  • Drug development - usually culminating in some form of clinical trial.



External links
  • International Union of Basic and Clinical Pharmacology (IUPHAR)
  • Dutch Society on Clinical Pharmacology and Biopharmaceutics (NVKF&B)
  • American Society for Clinical Pharmacology and Therapeutics (ASCPT)
  • American College of Clinical Pharmacology (ACCP)
  • British Pharmacological Society (BPS)