Impact Factor & Ranking

3.0 2.25 1.5 0.75 2.261 2017 2018 2019 2020 2021 2.261 2017 2018 2019 2020 2021
  • 1 133
    #69
  • 1 261
    #120
  • 1 136
    #80
  • 1 267
    #157
  • 1 138
    #103
  • 1 270
    #208
  • 1 140
    #110
  • 1 275
    #207
  • 1 139
    #119
  • 1 279
    #215

About Impact Factor & Ranking

Measure of the number of times an average paper in this journal is cited. Copyright Clarivate Analytics.

Metrics

Year I.F. Medicine, research & experimental Pharmacology & pharmacy
2021 2.261 119/139 215/279
2020 2.226 110/140 207/275
2019 1.832 103/138 208/270
2018 2.280 80/136 157/267
2017 2.658 69/133 120/261

Definition

Impact Factor

The Journal Impact Factor is published each year by Clarivate Analytics. It is a measure of the number of times an average paper in a particular journal is cited during the preceding two years.
For example:

A = the number of times articles published in a specific journal in 2014 and 2015 were cited by journals during 2016.
B = the total number of 'citable items' published by that journal in 2014 and 2015. ('Citable items' are usually articles, reviews, proceedings, etc.; not editorials or letters-to-the-editor.)

2016 impact factor = A/B.

Actual value is intentionally only displayed for the most recent year. Earlier values are available in the Journal Citation Reports from Clarivate Analytics

ISI ranking

Journals are often ranked by Impact Factor in an appropriate Clarivate Analytics subject category. As there are now two Impact Factors published – two-year and five-year Impact Factors – this rank may differ, so care is needed when assessing these ranked lists to understand which of the two metrics is being used. In addition, journals can be categorized in multiple subject categories, giving them different ranks for each subject. Consequently, a rank should always be in context to the subject category.