Measurement of drug concentration in the urine is an indirect method of determining the amount of drug in the body as the drug concentration and the rate of excretion of the drug are proportional to its amount in the plasma or blood.

What is pharmaceutical concentration?

The concentration of pharmaceutical preparations usually describes. the strength of the drug in the preparations. In practice it is. important that the patient receives the correct amount of the drug.

Why is concentration of drugs in medicine important?

Monitoring drug concentration is more useful when drugs are used to prevent an adverse outcome, for example, graft rejection or to avoid toxicity, as with aminoglycosides. A drug should satisfy certain criteria to be suitable for therapeutic drug monitoring.