If you recognize what happens as soon as you take it a drug v the following graphs, girlfriend will understand the scientific research behind adherence.

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What happens to medicine in the body?

When you take a drug, it is absorbed into the blood and distributed round the body. The drug reaches a top level. Quickly after this, the drug level drops steadily together its is removed from the body.

How a medicine is soaked up by her body right into the blood depends on the means it is taken:

A pill is usually absorbed into the blood through the stomach wall surfaces after that is swallowed – these have the right to become active in a couple of minutes yet usually take it an hour or two to with the highest possible concentration in the blood.IV drugs are injected straight into the blood work-related much faster – sometimes in seconds or minutes.

However a medicine is taken, it will certainly reach a top level and also then these levels will go down as the human body breaks under the active ingredients, typically as the turn around blood is filtered through the liver or kidneys.

This basic process happens v every drug – alcohol, nicotine, aspirin, HIV drugs…

Drugs are always absorbed an ext quickly than the body have the right to break lock down, so the highest possible concentration is reached relatively quickly, and also then the takes much longer to leave the body.

Drug absorption


After acquisition a drug, levels peak easily then drop gradually as the drug is got rid of (cleared from the body) – every drug has actually its very own absorption curve.The highest concentration is dubbed the Cmax.The total exposure to medicine over the dosing period is contact the Area Under the Curve (AUC)The time taken to acquire to the highest possible concentration is dubbed the TmaxThe time take away to mitigate the highest concentration by half (by 50%) is called a drug’s ‘half-life’ or T½.It takes approximately 5 half-lives for a drug to be cleared to negligible levels, but in theory, small quantities can be in the body for lot longer.When a medicine is taken frequently as treatment, the lowest concentration just before the next dose is called the Cmin or Ctrough (trough level).

Drug absorption after many doses


Each dose handled time makes sure that the drug stays over the lowest advantageous level (called the Minimum efficient Concentration or MEC).Remember the all these results are averages.Some people absorb drugs an ext quickly or an ext slowly than the average.Some civilization clear drugs an ext quickly or much more slowly 보다 the average.These outcomes are usually only calculated in blood and blood levels execute not always relate come how active a drug is within a cell. V nucleoside analogues, the level of the energetic drug within the cell is an ext important than blood level – graphs because that drugs levels within cells would certainly follow a similar pattern, but are more complicated to measure v some nucleosides, the level in blood or plasma carry out not enhance the levels inside cells.


Pharmacokinetics is the surname for methods that drugs are absorbed and got rid of by the body.

Although drugs behave in different way in different parts the the body (blood, brain, genital fluids, inside various cells etc) the straightforward principles of absorption and also elimination room similar.

Studies spring at drug levels in genital fluids usage the exact same terms and also measurement as medicine levels in blood (Cmin, Cmax etc). Importantly, a medicine behaves differently in each compartment.

Some drugs room rapidly soaked up in blood however might take a work to reach maximum levels in genital fluids. Part drugs have much greater concentrations in genital fluids than they in blood.

Last updated: 22 July 2009.


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