Citation Rankings
Highly Cited Researchers
Medical and Health Sciences / Health Sciences Highly Cited Researchers Citation Rankings 2025
The Citation Rankings (Highly Cited Researchers) highlight the most cited and influential researchers across a vast range of scientific fields, covering 197 main and sub-disciplines, including the Art and Humanities Citation Rankings and Social Sciences and Humanities Citation Rankings. This service, offered exclusively by AD Scientific Index, aims to provide a balanced perspective by excluding data from CERN and other statistical sources that disproportionately favor certain researchers, particularly in the social sciences and humanities. This unique approach addresses the advantages researchers with multi-author publications and CERN involvement hold over others. Furthermore, citation rankings help uncover rule violations and unethical practices within the research community. For more detailed citation analyses, explore the Scientists Last 6 Years Citation Index, Universities Total Citations Rankings 2025, and Universities Last 6 Years Citations Rankings 2025.
* Total Citation Counts Rankings
Ranking Based On Selection: 1
Health Economics
Public Health
Health Policy and Systems Research
Pharmaco-economics
Pharmaco-epidemiology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
54,820
47,916
0.874
* Total Citation Counts Rankings
Ranking Based On Selection: 2
Public Health
Health Systems and Policy
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
41,096
33,351
0.812
* Total Citation Counts Rankings
Ranking Based On Selection: 3
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
17,237
10,297
0.597
* Total Citation Counts Rankings
Ranking Based On Selection: 4
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,221
4,204
0.344
* Total Citation Counts Rankings
Ranking Based On Selection: 5
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,969
8,429
0.846
* Total Citation Counts Rankings
Ranking Based On Selection: 6
Ethnopharmacology
Natural Products Pharmacology
Autonomic Pharmacology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,296
2,722
0.373
* Total Citation Counts Rankings
Ranking Based On Selection: 7
Pharmaceutics
drug delivery
nanotechnology/nanomedicines
pharmaceutical microbiology & biotechnology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,575
3,691
0.561
* Total Citation Counts Rankings
Ranking Based On Selection: 8
Cardiothoracic surgery
vascular surgery
esophageal surgery
surgical education
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,853
2,042
0.421
* Total Citation Counts Rankings
Ranking Based On Selection: 9
Nephrology
Cardio-metabolic syndrome
Transplant Science
Clinical Trials
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,623
3,310
0.716
* Total Citation Counts Rankings
Ranking Based On Selection: 10
Inorganic Chemistry
Thermal behaviour of complexes
Water treatment and adsorption
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,383
1,305
0.298
* Total Citation Counts Rankings
Ranking Based On Selection: 11
Nephrology
Malaria in children
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,731
2,476
0.664
* Total Citation Counts Rankings
Ranking Based On Selection: 12
Anaesthesia R&E
Palliative Care
Pain Management
Implementation Science
e-Health
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,454
3,155
0.913
* Total Citation Counts Rankings
Ranking Based On Selection: 13
Reproductive Endocrinology and Infertility
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,184
1,071
0.336
* Total Citation Counts Rankings
Ranking Based On Selection: 14
pediatrics
infectious diseases
implementation science
HIV
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,171
2,345
0.740
* Total Citation Counts Rankings
Ranking Based On Selection: 15
Natural Products Pharmacology & Toxicology
Immunopharmacology
Biological Response Modifiers
Vaccine adjuvants
Infectious Dis
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,124
1,678
0.537
* Total Citation Counts Rankings
Ranking Based On Selection: 16
Pharmaceutics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,977
1,072
0.360
* Total Citation Counts Rankings
Ranking Based On Selection: 17
Infertility
Reproductive physiology and HIV research
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,963
1,321
0.446
* Total Citation Counts Rankings
Ranking Based On Selection: 18
Urogynaecology and pelvic reconstruction
Feto-Maternal health
infertility
infectious diseases in
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,880
2,038
0.708
* Total Citation Counts Rankings
Ranking Based On Selection: 19
Medical Microbiology
Molecular biology
Public Health
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,860
1,755
0.614
* Total Citation Counts Rankings
Ranking Based On Selection: 20
Pharmacology
natural products pharmacology
drug discovery
antiinflammatory
immunomodulators
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,660
1,098
0.413
* Total Citation Counts Rankings
Ranking Based On Selection: 21
Maternal Fetal Medicine
Gynecological Oncology
Reproductive Endocrinology and Infertility
Gynecological Urology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,594
1,091
0.421
* Total Citation Counts Rankings
Ranking Based On Selection: 22
Natural Product Pharmacology & Toxicology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,585
1,065
0.412
* Total Citation Counts Rankings
Ranking Based On Selection: 23
Natural Products Research
Medicinal Chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,411
1,198
0.497
* Total Citation Counts Rankings
Ranking Based On Selection: 24
Public Health
Health Economics
Health Systems Financing
Universal Health Coverage
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,400
1,490
0.621
* Total Citation Counts Rankings
Ranking Based On Selection: 25
Pediatric surgery
neonatal surgery
oncology
global surgery
surgical education
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,386
1,731
0.725
* Total Citation Counts Rankings
Rankings
8,648
9
1
Ranking Based On Selection: 1
Obinna E. Onwujekwe
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
54,820
47,916
0.874
Health Economics
Public Health
Health Policy and Systems Research
Pharmaco-economics
Pharmaco-epidemiology
* Total Citation Counts Rankings
Rankings
13,671
11
2
Ranking Based On Selection: 2
Benjamin Uzochukwu
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
41,096
33,351
0.812
Public Health
Health Systems and Policy
* Total Citation Counts Rankings
Rankings
49,716
23
2
Ranking Based On Selection: 3
Luis Miguel Cardoso
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
17,237
10,297
0.597
* Total Citation Counts Rankings
Rankings
77,600
34
5
Ranking Based On Selection: 4
Ryo Takahashi
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,221
4,204
0.344
* Total Citation Counts Rankings
Rankings
98,826
44
7
Ranking Based On Selection: 5
Abdulsalam Abdullahi
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,969
8,429
0.846
* Total Citation Counts Rankings
Rankings
140,070
76
5
Ranking Based On Selection: 6
Peter A. Akah
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,296
2,722
0.373
Ethnopharmacology
Natural Products Pharmacology
Autonomic Pharmacology
* Total Citation Counts Rankings
Rankings
156,160
95
6
Ranking Based On Selection: 7
Anthony Attama
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,575
3,691
0.561
Pharmaceutics
drug delivery
nanotechnology/nanomedicines
pharmaceutical microbiology & biotechnology
* Total Citation Counts Rankings
Rankings
210,949
174
9
Ranking Based On Selection: 8
John C. Eze
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,853
2,042
0.421
Cardiothoracic surgery
vascular surgery
esophageal surgery
surgical education
* Total Citation Counts Rankings
Rankings
220,792
185
12
Ranking Based On Selection: 9
Ifeoma Ulasi
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,623
3,310
0.716
Nephrology
Cardio-metabolic syndrome
Transplant Science
Clinical Trials
* Total Citation Counts Rankings
Rankings
232,040
197
9
Ranking Based On Selection: 10
Ahmed A. Atia
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,383
1,305
0.298
Inorganic Chemistry
Thermal behaviour of complexes
Water treatment and adsorption
* Total Citation Counts Rankings
Rankings
268,267
268
20
Ranking Based On Selection: 11
Henrietta Okafor
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,731
2,476
0.664
Nephrology
Malaria in children
* Total Citation Counts Rankings
Rankings
286,695
304
24
Ranking Based On Selection: 12
Tonia C Onyeka
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,454
3,155
0.913
Anaesthesia R&E
Palliative Care
Pain Management
Implementation Science
e-Health
* Total Citation Counts Rankings
Rankings
307,245
349
26
Ranking Based On Selection: 13
HE Onah
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,184
1,071
0.336
Reproductive Endocrinology and Infertility
* Total Citation Counts Rankings
Rankings
308,248
350
27
Ranking Based On Selection: 14
Echezona E. Ezeanolue
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,171
2,345
0.740
pediatrics
infectious diseases
implementation science
HIV
* Total Citation Counts Rankings
Rankings
312,144
356
28
Ranking Based On Selection: 15
Chukwuemeka S. Nworu
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,124
1,678
0.537
Natural Products Pharmacology & Toxicology
Immunopharmacology
Biological Response Modifiers
Vaccine adjuvants
Infectious Dis
* Total Citation Counts Rankings
Rankings
324,857
401
31
Ranking Based On Selection: 16
Michael Adikwu
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,977
1,072
0.360
* Total Citation Counts Rankings
Rankings
326,095
404
32
Ranking Based On Selection: 17
Samuel Obi
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,963
1,321
0.446
Infertility
Reproductive physiology and HIV research
* Total Citation Counts Rankings
Rankings
333,564
415
33
Ranking Based On Selection: 18
Emmanuel Onyebuchi Valentine Ugwu
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,880
2,038
0.708
Urogynaecology and pelvic reconstruction
Feto-Maternal health
infertility
infectious diseases in
* Total Citation Counts Rankings
Rankings
335,503
419
34
Ranking Based On Selection: 19
Nweze Emeka Innocent
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,860
1,755
0.614
Medical Microbiology
Molecular biology
Public Health
* Total Citation Counts Rankings
Rankings
355,728
477
39
Ranking Based On Selection: 20
Charles O. Okoli
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,660
1,098
0.413
Pharmacology
natural products pharmacology
drug discovery
antiinflammatory
immunomodulators
* Total Citation Counts Rankings
Rankings
362,920
505
40
Ranking Based On Selection: 21
Benjamin Ozumba
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,594
1,091
0.421
Maternal Fetal Medicine
Gynecological Oncology
Reproductive Endocrinology and Infertility
Gynecological Urology
* Total Citation Counts Rankings
Rankings
363,877
513
41
Ranking Based On Selection: 22
Isaac Asuzu
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,585
1,065
0.412
Natural Product Pharmacology & Toxicology
* Total Citation Counts Rankings
Rankings
383,905
576
43
Ranking Based On Selection: 23
Patience Osadebe
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,411
1,198
0.497
Natural Products Research
Medicinal Chemistry
* Total Citation Counts Rankings
Rankings
385,183
581
45
Ranking Based On Selection: 24
Chima Onoka
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,400
1,490
0.621
Public Health
Health Economics
Health Systems Financing
Universal Health Coverage
* Total Citation Counts Rankings
Rankings
386,924
585
46
Ranking Based On Selection: 25
Sebastian Ekenze
University of Nigeria
Nsukka, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,386
1,731
0.725
Pediatric surgery
neonatal surgery
oncology
global surgery
surgical education