Side effect

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Side effect

Quality:

Side effect - medicinal effect, whether therapeutic or adverse, that is secondary to the one intended. Article “Side effect” in English Wikipedia has 31.8 points for quality (as of July 1, 2026). The article contains 21 references and 5 sections.

This article has the best quality in Ukrainian Wikipedia. However, this article is the most popular in English version.

Since the creation of article “Side effect”, its content was written by 128 registered users of English Wikipedia and edited by 461 registered Wikipedia users in all languages.

The article is cited 988 times in English Wikipedia and cited 5729 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (English): #2636 in November 2002
  • Global: #5623 in November 2002

The highest popularity rank from 2008:

  • Local (English): #29892 in August 2009
  • Global: #36771 in August 2009

There are 23 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2026 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

Languages with the highest quality

#LanguageQuality gradeQuality score
1Ukrainian (uk)
Побічна дія (медицина)
61.6285
2Spanish (es)
Efecto secundario (medicina)
39.0105
3Chinese (zh)
副作用
37.1883
4Galician (gl)
Efecto secundario (medicina)
36.1474
5Japanese (ja)
副作用
34.2608
6English (en)
Side effect
31.7648
7Armenian (hy)
Կողմնակի ազդեցություն
29.3977
8Arabic (ar)
أثر جانبي
24.3439
9French (fr)
Effet secondaire (médecine)
23.3151
10Serbian (sr)
Kontraindikacija
21.7406
More...

The following table shows the most popular language versions of the article.

Most popular in all the time

The most popular language versions of the article "Side effect" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
Side effect
1 952 184
2Japanese (ja)
副作用
553 864
3Arabic (ar)
أثر جانبي
470 375
4Portuguese (pt)
Efeito colateral
428 791
5Ukrainian (uk)
Побічна дія (медицина)
394 512
6Italian (it)
Effetto collaterale
242 927
7French (fr)
Effet secondaire (médecine)
211 476
8Dutch (nl)
Bijwerking
204 405
9Persian (fa)
اثرات جانبی دارو
189 413
10Indonesian (id)
Efek samping
116 310
More...

The following table shows the language versions of the article with the highest popularity in the last month.

Most popular in June 2026

The most popular language versions of the article "Side effect" in June 2026
#LanguagePopularity awardRelative popularity
1English (en)
Side effect
3 625
2Japanese (ja)
副作用
644
3Ukrainian (uk)
Побічна дія (медицина)
480
4Spanish (es)
Efecto secundario (medicina)
429
5Chinese (zh)
副作用
264
6French (fr)
Effet secondaire (médecine)
231
7Persian (fa)
اثرات جانبی دارو
208
8Portuguese (pt)
Efeito colateral
164
9Italian (it)
Effetto collaterale
130
10Korean (ko)
부작용
115
More...

The following table shows the language versions of the article with the highest Authors’ Interest.

The highest AI

Language versions of the article "Side effect" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1English (en)
Side effect
128
2Japanese (ja)
副作用
52
3Italian (it)
Effetto collaterale
28
4Chinese (zh)
副作用
27
5Dutch (nl)
Bijwerking
25
6Persian (fa)
اثرات جانبی دارو
24
7Spanish (es)
Efecto secundario (medicina)
22
8French (fr)
Effet secondaire (médecine)
22
9Finnish (fi)
Sivuvaikutus
19
10Arabic (ar)
أثر جانبي
17
More...

The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

The highest AI in June 2026

Language versions of the article "Side effect" with the highest AI in June 2026
#LanguageAI awardRelative AI
1French (fr)
Effet secondaire (médecine)
2
2Arabic (ar)
أثر جانبي
1
3Czech (cs)
Vedlejší účinek
0
4English (en)
Side effect
0
5Spanish (es)
Efecto secundario (medicina)
0
6Basque (eu)
Albo ondorio (medikuntza)
0
7Persian (fa)
اثرات جانبی دارو
0
8Finnish (fi)
Sivuvaikutus
0
9Galician (gl)
Efecto secundario (medicina)
0
10Armenian (hy)
Կողմնակի ազդեցություն
0
More...

The following table shows the language versions of the article with the highest number of citations.

The highest CI

Language versions of the article "Side effect" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1Ukrainian (uk)
Побічна дія (медицина)
1 061
2English (en)
Side effect
988
3Japanese (ja)
副作用
733
4Italian (it)
Effetto collaterale
414
5Persian (fa)
اثرات جانبی دارو
280
6Czech (cs)
Vedlejší účinek
245
7Chinese (zh)
副作用
245
8French (fr)
Effet secondaire (médecine)
241
9Indonesian (id)
Efek samping
241
10Arabic (ar)
أثر جانبي
194
More...

Scores

Estimated value for Wikipedia:
English:
Global:
Popularity in June 2026:
English:
Global:
Popularity in all years:
English:
Global:
Authors in June 2026:
English:
Global:
Registered authors in all years:
English:
Global:
Citations:
English:
Global:

Quality measures

Interwikis

#LanguageValue
arArabic
أثر جانبي
csCzech
Vedlejší účinek
enEnglish
Side effect
esSpanish
Efecto secundario (medicina)
euBasque
Albo ondorio (medikuntza)
faPersian
اثرات جانبی دارو
fiFinnish
Sivuvaikutus
frFrench
Effet secondaire (médecine)
glGalician
Efecto secundario (medicina)
hyArmenian
Կողմնակի ազդեցություն
idIndonesian
Efek samping
itItalian
Effetto collaterale
jaJapanese
副作用
koKorean
부작용
nlDutch
Bijwerking
plPolish
Skutek uboczny (medycyna)
ptPortuguese
Efeito colateral
shSerbo-Croatian
Kontraindikacija
srSerbian
Kontraindikacija
trTurkish
Yan etki
ukUkrainian
Побічна дія (медицина)
viVietnamese
Tác dụng phụ
zhChinese
副作用

Popularity rank trends

Best Rank English:
#29892
08.2009
Global:
#36771
08.2009

AI rank trends

Best Rank English:
#2636
11.2002
Global:
#5623
11.2002

Local AI rank history

Global AI rank history

Languages comparison

Important global interconnections (July 2025 – June 2026)

Wikipedia readers most often find their way to information on Side effect from Wikipedia articles about Amitriptyline, Quinine, Michelle Trachtenberg, Withania somnifera and L-methamphetamine. Whereas reading the article about Side effect people most often go to Wikipedia articles on Side effect, Side effect, Adverse effect, Drug and Adverse drug reaction.

Cumulative results of quality and popularity of the Wikipedia article

List of Wikipedia articles in different languages (starting with the most popular):

News from 1 July 2026

On 1 July 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: 2026 FIFA World Cup, Kylian Mbappé, Erling Haaland, Democratic Republic of the Congo, FIFA World Cup, Harry Kane, Romelu Lukaku, Senegal, Michael Olise, Sadio Mané.

In English Wikipedia the most popular articles on that day were: 2026 FIFA World Cup, Harry Kane, Julián Quiñones, List of FIFA World Cup top goalscorers, Kylian Mbappé, Democratic Republic of the Congo, Erling Haaland, DR Congo national football team, Melat Kiros, FIFA World Cup.

About WikiRank

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 50 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2026. When calculating current popularity and AI of articles data from June 2026 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2026... More information