Pharmacokinetic activity depends on the number of drug levels at the target site. Recent advances in analytical and quantitative methodologies are often non-invasive assessments of drug pharmacokinetics at the site of action for a better understanding of pharmacokinetic properties. Pharmacodynamics is affected by various factors including receptor binding and sensitivity, post-receptor effects, chemical interactions, physiologic changes due to genetic mutations, diseases, aging, or the impact of other drugs. Pharmacodynamics and pharmacokinetics explain the effects of drugs on the host body.
