Pharmacokinetics describes the effect of the body on the chemical -LRB- e.g. half-life and volume of distribution -RRB- , and pharmacodynamics describes the chemical 's effect on the body -LRB- desired or toxic -RRB- .

Pharmacokinetics describes the what effect the body will have on the chemical , and pharmacodynamics describes the chemical 's effect on the body -LRB- desired or toxic -RRB- .
