|Pharmacology of a drug can be studied under two subheadings i.e, pharmacokinetics and pharmacodynamics. Pharmacokinetics which deals with study of absorption, distribution, metabolization and excretion which can be briefly described as the study of what the body does to a drug. The two phases metabolism and excretion can be grouped together under the title elimination. High-impact journals are those considered to be highly influential in their respective fields. The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.