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ANTIHYPERLIPIDEMIA AGENTS Plasma lipids Transported in bloodstream in form of macromolecular complexes of lipid and known as lipoproteins Two major clinical importance/sequelae of high lipid Acute pancreatitis atherosclerosis Hyperlipoproteinemia Hyperlipidemia Lipoprotein disorders Primary hypertriglyceridemias Primary chylomicronemia Familial hypertriglyceridemia Familial combined hyperlipoproteinemia Familial dysbetalipoproteinemia Primary hypercholesterolemias Famimial hypercholesterolemia Familial ligan-defective apolipoprotein B Familial combine hyperlipoproteinemia Lp(a) hyperlipoproteinemia Secondary hyperlipoproteinemia Lipid-lowering drugs Several drugs are used To decrease plasma LDL-cholesterol Drug therapy is only one approach Dietary measures are the first [...] | 19th January, 2010 | More News
Pharmacokinetic Parameters
Excretion of drug (Major)
It is the passage out of drug from body.
Urine
Most drugs
Most important channelvia Kidney
Faeces
Unabsorbed fraction of drug
In the bile
via liver metabolism
Molecular weight > 300
Eg heavy metals
Exhaled air
Gases
Volatile liquids - alcohol
Excretion of drug (minor)
Saliva and sweat
Eg Lithium
Potassium iodide
Thiocyanates
Rifampin
Milk
Drug enter breast milk by passive diffusion
Lipid soluble drug
Less protein binding
Basic drug – milk is more alkaline
List [...]
Metabolism and excretion
Pharmacokinetic knowledge
Will determine of drugs of its
Route of administration
Dose
Latency of onset
Time of peak action
Duration of action
Frequency of administration
Pharmacokinetic processes
Transport of the drug across the biological membrane
Biological membrane
is a layer that acts as a barrier within or around a cell.
Thickness – 100 A0
It is a lipid bilayer.
Composed of a double layer of lipid-class molecules,
phospholipid and
cholesterol
with occasional [...]
Absorption and Distribution
Pharmacokinetics - WTBDTTD
Quantitative study of drug movement:
In
Through of the body
Out
•It is dealing with the dose-concentration part
•three primary processes of pharmacokinetics are
–absorption,
–distribution, and
–elimination
•It determine
–how rapidly and
–for how long the drug will appear at the target organ.
»Katzung (9th edition)
Principles of Pharmacokinetic
a drug should be able to reach its intended [...]