Cyprian Ogbona Onyeji

University of Nigeria

Also at Obafemi Awolowo Universityfrom their recent papers

Publishing since 1986, latest 2026

Pharmacology
Pharmacology
Analytical Chemistry
Public Health, Environmental and Occupational Health
Molecular Biology
Pharmaceutical Science

Publications: 571986–2026
Citations: 553to those papers
h-index: 14i10-index 22
Field-weighted impact: 0.521.00 is the world average
World top 10%: 5%3 of 57 scored papers
Open access: 51%29 papers free to read

2 other works — preprints, datasets and the like — are listed but not counted.

By year

Papers, and the citations to them

Publications, left axisCitations to that year’s papers, right axis2026 still in progress

Career

On their papers

Every institution they have given on a paper.

Publications

57 in all

Download CV:PDFWord

Citations received each year

Peerford

To all their work, old papers included. Google Scholar also counts citations from theses, books and web pages, so its line runs higher.

What they work on

From the classification of each paper

Subfields

Pharmacology2239%
Pharmacology1832%
Analytical Chemistry1221%
Public Health, Environmental and Occupational Health1221%
Molecular Biology916%
Pharmaceutical Science916%
Pediatrics, Perinatology and Child Health814%
Infectious Diseases712%
Plant Science712%
Materials Chemistry59%

Health Sciences
Life Sciences
Physical Sciences

Topics most written on

Antibiotics Pharmacokinetics and Efficacy14
Analytical Methods in Pharmaceuticals12
Pharmacogenetics and Drug Metabolism12
Malaria Research and Control10
Drug Solubulity and Delivery Systems8
HIV/AIDS drug development and treatment6
Crystallization and Solubility Studies5
Drug Transport and Resistance Mechanisms5
Drug-Induced Ocular Toxicity5
Pharmacological Effects of Natural Compounds5
Pharmacological Effects and Toxicity Studies4
Drug-Induced Hepatotoxicity and Protection3

Who they write with

Their most frequent co-authors, and the papers those co-authors share

Where their co-authors are

16% of their papers have a co-author abroad

papers co-written1234567Home

Most frequent partner countries

United States7
Australia1
Brazil1
Switzerland1
China1
Germany1
Spain1
United Kingdom1

Papers with at least one author in that country.

Institutions written with most

Obafemi Awolowo UniversityNG52 papers
Adekunle Ajasin UniversityNG10 papers
Ekiti State UniversityNG5 papers
University of Wisconsin–MilwaukeeUS4 papers
University of South CarolinaUS3 papers
University of IlorinNG3 papers
University of IbadanNG2 papers
Enugu State University of Science and TechnologyNG2 papers
Amsterdam University Medical CentersNL1 paper
Charles Darwin UniversityAU1 paper

Where they publish

Journal of Pharmacy and Pharmacology4
Therapeutic Drug Monitoring4
European Journal of Pharmaceutical Sciences3
Journal of Pharmaceutical Research International3
Tropical Journal of Pharmaceutical Research3
AFRICAN JOURNAL OF BIOTECHNOLOGY2

Development goals addressed

From each paper’s title and abstract

3Good health and well-being31
6Clean water and sanitation8
2Zero hunger5
17Partnerships for the goals4
1No poverty1

Most cited

Pharmacokinetic interactions between ritonavir and quinine in healthy volunteers following concurrent administration
British Journal of Clinical Pharmacology3
200948 citationsWorld top 10%Open access · Bronze
Factors affecting the electrocardiographic QT interval in malaria: A systematic review and meta-analysis of individual patient data
PLoS Medicine3
202041 citationsWorld top 10%Open access · Gold

Drug Metabolism and Bioanalysis

Monitoring the quality of quinine injection in retail outlets in south-east Nigeria

2025Tropical Journal of Pharmaceutical ResearchJournalOpen accessSenior author0 citations10.4314/tjpr.v24i5.3

PHARMACOKINETIC DRUG-DRUG INTERACTIONS MEDIATED BY ORGANIC CATION TRANSPORTERS: ARE ANTIMALARIAL DRUGS SIGNIFICANTLY AFFECTED?

2024Universal Journal of Pharmaceutical ResearchJournalOpen accessFirst authorCorresponding0 citations10.22270/ujpr.v9i2.1092

Insights on Prospects of Prediction of Drug Bioavailability from in Vitro Models

2023Bioequivalence & Bioavailability International JournalJournalOpen accessFirst authorCorresponding0 citations10.23880/beba-16000210

PROSPECTS OF INTEGRATION OF NANOTECHNOLOGY TO ANTIMALARIAL HERBAL REMEDIES FOR IMPROVED THERAPEUTIC EFFICACY – A CONCISE REVIEW

2022African Journal of Traditional Complementary and Alternative MedicinesJournalOpen accessFirst authorCorresponding3 citations10.21010/ajtcamv18i1.3

Post-Marketing Surveillance of Quality of Artemether Injection Marketed in Southwest Nigeria

2020American Journal of Tropical Medicine and HygieneJournalOpen access3 citations10.4269/ajtmh.20-0190

Preparation and Physicochemical Evaluation of Lumefantrine-2-Hydroxypropyl-β-cyclodextrin Binary Systems

2020Journal of Pharmaceutical Research InternationalJournalOpen accessSenior author0 citations10.9734/jpri/2020/v32i1330589

Appraisal of Bioenhancers in Improving Oral Bioavailability: Applications to Herbal Medicinal Products

2018Journal of Pharmaceutical Research InternationalJournalOpen accessSenior author24 citations10.9734/jpri/2018/45330

Induction of Amodiaquine Metabolism by Rifampicin Following Concurrent Administration in Healthy Volunteers

2018Journal of Exploratory Research in PharmacologyJournalOpen accessSenior author6 citations10.14218/jerp.2017.00024

Cyclodextrin Complexes: Utility in Improving Drug Bioavailability and Other Applications

2018Bioequivalence & Bioavailability International JournalJournalOpen accessFirst authorCorresponding2 citations10.23880/beba-16000130

Nanoparticles: Key to Optimization of Drug Therapy

2018Advances in Pharmacology & Clinical TrialsJournalOpen accessFirst authorCorresponding1 citation10.23880/apct-16000125

In vitro study of interaction between quinine and Garcinia kola

2016Tropical Journal of Pharmaceutical ResearchJournalOpen access3 citations10.4314/tjpr.v15i7.17

EFFECTS OF CO-TRIMOXAZOLE CO-ADMINISTRATION ON THE PHARMACOKINETICS OF AMODIAQUINE IN HEALTHY VOLUNTEERS

2015International Journal of Pharmacy and Pharmaceutical SciencesJournalOpen accessSenior author3 citations

Influence of a Nigerian honey on CYP3A4 biotransformation of quinine in healthy volunteers

2015Journal of Clinical Pharmacy and TherapeuticsJournalOpen access0 citations10.1111/jcpt.12303

Chemotherapeutic action between Khaya grandifoliola (WELW) CDC steam bark extract and two anti-malarial drugs in mice

2010African Journal of Traditional Complementary and Alternative MedicinesJournalOpen access13 citations10.4314/ajtcam.v7i4.56705

Effects of concurrent administration of nevirapine on the disposition of quinine in healthy volunteers

2009Journal of Pharmacy and PharmacologyJournalOpen accessCorresponding27 citations10.1211/jpp/61.04.0004

Preparation and in vitro evaluation of suppositories of halofantrine hydrochloride

2006AFRICAN JOURNAL OF BIOTECHNOLOGYJournalOpen accessSenior author10 citations10.4314/ajb.v5i19.55850

Effects of tetracycline on the pharmacokinetics of halofantrine in healthy volunteers

2004British Journal of Clinical PharmacologyJournalOpen accessCorresponding11 citations10.1111/j.1365-2125.2004.02087.x

Effects of absorption enhancers in chloroquine suppository formulations: I

1999European Journal of Pharmaceutical SciencesJournalFirst authorCorresponding16 citations10.1016/s0928-0987(99)00053-6

Altered pharmacokinetics of halofantrine by an antacid, magnesium carbonate

1998European Journal of Pharmaceutics and BiopharmaceuticsJournalCorresponding13 citations10.1016/s0939-6411(98)00029-0

Pharmacokinetics and bioavailability of drotaverine in humans

1996European Journal of Drug Metabolism and PharmacokineticsJournal29 citations10.1007/bf03189716

Time-dependent variability of chloroquine secretion into human saliva

1996Pharmacy World & ScienceJournalFirst author4 citations10.1007/bf00735962

African Journal of Traditional Complementary and Alternative Medicines

Bioequivalence & Bioavailability International Journal2

How it can be read

51% free to read

Diamond 11 · 19%Free to read and to publish
Gold 6 · 11%In an open-access journal
Hybrid 1 · 2%Open in a subscription journal
Bronze 4 · 7%Free to read, no open licence
Green 7 · 12%A copy in a repository
Closed 28 · 49%Behind a paywall

Who funds it

6 of 57 papers name a funder

Carnegie Corporation of New York3
National Institute of Neurological Disorders and Stroke2
American Society of Tropical Medicine and Hygiene1
Bill and Melinda Gates Foundation1
Eunice Kennedy Shriver National Institute of Child Health and Human Development1
Medical Research Council1
National Cancer Institute1
National Institute of Mental Health1

High-performance liquid chromatographic method for the determination of drotaverine in human plasma and urine

Journal of Chromatography B Biomedical Sciences and Applications6

199336 citations

Pharmacokinetics and bioavailability of drotaverine in humans

European Journal of Drug Metabolism and Pharmacokinetics3

199629 citations