'drug concentrations' is correct and usable in written English.
For example, "Researchers have observed significant changes in drug concentrations in response to certain external stimuli."
Sophisticated software is increasingly able to predict drug concentrations in different tissues, and toxicity or other biological effects, based on chemical structure.
Antiepileptic drug concentrations for raw waste water samples.
Final protein and drug concentrations were 0 and 0.2 mM.
Pharmacodynamics relates the drug concentrations to its specific effect.
The consequence is finding lower-than-expected plasma drug concentrations.
No specific variable was associated with excessive drug concentrations.
Pharmacokinetic monitoring usually focuses on reaching certain target drug concentrations.
Drug concentrations were measured by high-performance liquid chromatography.
Drug concentrations in blood were measured using a bioassay.
Also drug concentrations up to 40% can be processed.
Drug concentrations were determined by high-performance liquid chromatography.
