Concentrations of Drugs in the Blood are a Balance Between Input and Output
- The concentrations of all chemicals in your body are the result of a balance between input and output.
- For drugs the input is usually a steady injection through an intravenous (IV) line or a periodic uptake through pills taken at regular intervals.
- The output of drugs is mainly through 2 organs, the liver and kidney.
- When the output equals the input a steady-state is attained and the concentration will no longer change: