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Glossary of Terms

  • Absorption
    The process by which the drug enters the blood stream
  • Active uptake
    Absorption of drugs and nutrients by means of a chemical reaction as opposed to diffusion
  • Activity
    This is where the drug acts upon the body
  • Adverse drug reaction
    Any response to a drug that is noxious and unintended and that occurs at doses used in man for prophylaxis, diagnosis or therapy
  • Akathisia
    Restlessness
  • An assault
    The apprehension that there will be an unlawful touching
  • Anorexia
    Loss of appetite
  • Arrhythmias
    Deviations from the normal rhythm of the heart
  • Ataxia
    Shaky movements and an unsteady gait
  • Battery
    Touching without consent
  • Blood-brain barrier
    The semi-permeable membrane which keeps circulating blood separate from the tissue fluids surrounding the brain
  • Cardiac arrhythmia
    Abnormal heart beat
  • Cerebral perfusion
    Blood supply to the brain
  • Delirium
    Mental disorder characterised by illusions, disorientation,hallucinations and sometimes agitation
  • Distribution
    Where the drug goes in the body after absorption.This depends on the nature of the drug. Some drugs tendto accumulate in fatty tissue, some in muscle, some bind to plasma proteins in the blood, some remain free in the blood plasma. Most do a mixture of the above.
  • Drug compliance
    How closely to the prescriber's intentions a medication is actually taken
  • Dysarthria
    Speech disorder
  • Dysphagia
    Swallowing difficulties
  • Dystonia
    Abnormal face and body movements
  • Enteric coating
    This is a special coating on the outside of a tablet or capsule that does not dissolve in acid
  • Excretion
    Where the drug or the "metabolites" of the drug leave the body. This is usually undertaken by the kidneys.
  • Extrapyramidal (anti-dopaminergic) side effects
    Otherwise known as Parkinsonism. Characterised by: tremor, rigidity, povity of movement, difficulty swallowing, loss of facial tone, and stooped, shuffling gait
  • Formulation
    Type of preparation. E.g. Tablets, capsules,suspensions & solutions
  • Glomerular filtration rate
    the rate at which blood is filtered through the kidneys
  • Hang-over effects
    Drug effects lasting into the following day
  • Hepatic
    Concerning the liver
  • Homeostatic mechanisms
    The processes by which the internal systems of the body are maintained in balance
  • Hyponatraemia
    Low sodium levels
  • Hypothermia
    Low body temperature
  • Inanition
    Exhaustion caused by lack of nutrients in the blood
  • Induction
    Speeding up
  • Intracellular fluid
    Liquid contained within the cells of the body
  • Ionised
    Electrically polarised. Substances that are ionised tend to be water soluble
  • Lipid solubility
    Solubility in fatty tissues
  • Metabolism
    This is the breakdown of the drug by the body usually undertaken by enzymes in the liver. Some drugs are designed so as to become active after they have been metabolised. These are called "pro-drugs".
  • Organic changes
    Physical and structural alteration
  • Palpitations
    An awareness of the heartbeat
  • Paradoxical excitement
    Agitation caused by administration of a sedative
  • Peak plasma level
    The highest concentration that a drug reaches in the blood
  • pH
    Level of acidity. Less than 7 is acidic, 7 is neutral, more than 7 is alkaline
  • Pharmacodynamics
    What the drug does to a body
  • Pharmacokinetics
    What the body does to a drug
  • Polypharmacy
    Multiple drug prescribing
  • Prophylaxis
    Prevention
  • Prostatism
    Enlargement of the prostate gland
  • Receptor - a, b1 and b2
    Different types of adrenaline receptor sites inthe body
  • Renal
    Concerning the kidneys
  • Steady state
    The plasma level oscillating between the same maximum and minimum with each successive dose
  • Sub-therapeutic
    Below the dose required to have a medicinal benefit
  • Syncope
    Fainting
  • Tachycardia
    Quickened pulse
  • Tardive dyskinesia 
    Involuntary, abnormal movements
  • Therapeutic index
    The difference between the minimum plasma level for the drug to be clinically effective and the plasma level at which the drug becomes toxic
  • Thermoregulation
    Control of temperature
  • Tubular secretion 
    The process by which the blood is filtered by the kidneys and reabsorption
  • Xerostemia
    Dry mouth