Hiroshi Okada

1.6k total citations
90 papers, 984 citations indexed

About

Hiroshi Okada is a scholar working on Ecology, Evolution, Behavior and Systematics, Pharmacology and Geriatrics and Gerontology. According to data from OpenAlex, Hiroshi Okada has authored 90 papers receiving a total of 984 indexed citations (citations by other indexed papers that have themselves been cited), including 27 papers in Ecology, Evolution, Behavior and Systematics, 22 papers in Pharmacology and 17 papers in Geriatrics and Gerontology. Recurrent topics in Hiroshi Okada's work include Plant and animal studies (18 papers), Plant Diversity and Evolution (17 papers) and Pharmaceutical Practices and Patient Outcomes (17 papers). Hiroshi Okada is often cited by papers focused on Plant and animal studies (18 papers), Plant Diversity and Evolution (17 papers) and Pharmaceutical Practices and Patient Outcomes (17 papers). Hiroshi Okada collaborates with scholars based in Japan, Indonesia and United States. Hiroshi Okada's co-authors include Atsuko Takano, Shigeyuki Ebisu, TAKAFUMI YAMAZAKI, Masaki Dobashi, Masato Fujisawa, Sadao Kamidono, Hirokazu Tsukaya, Isao Hara, Takeo Nakayama and Maryati Mohamed and has published in prestigious journals such as PLoS ONE, The Journal of Urology and Human Reproduction.

In The Last Decade

Hiroshi Okada

80 papers receiving 919 citations

Peers

Countries citing papers authored by Hiroshi Okada

Since Specialization

Citations

This map shows the geographic impact of Hiroshi Okada's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Hiroshi Okada with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hiroshi Okada more than expected).

Fields of papers citing papers by Hiroshi Okada

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Hiroshi Okada. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Hiroshi Okada. The network helps show where Hiroshi Okada may publish in the future.

Co-authorship network of co-authors of Hiroshi Okada

This figure shows the co-authorship network connecting the top 25 collaborators of Hiroshi Okada. A scholar is included among the top collaborators of Hiroshi Okada based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Hiroshi Okada. Hiroshi Okada is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

#	Work	Indexed citations
1	Estimating Risks of Central Nervous System Disturbance Associated with Medications for Herpes Zoster: Findings from a Regional Population-Based Cohort Study Using the Shizuoka Kokuho Database 2025 ·Drugs - Real World Outcomes ·(unknown), Eiji Nakatani, Hideaki Kaneda, Hiroshi Okada, Hideo Hashizume, Nagato Kuriyama, (unknown)	0
2	Red yeast rice supplement consumption and health hazards in Japan–what role is desired for community pharmacists? 2025 ·Health Policy and Technology ·(unknown), Yoshitaka Nishikawa, Shota Suzuki, (unknown), Hiroshi Okada	0
3	Cerebral Venous Sinus Thrombosis with Bilateral Optic Disc Swelling and Bilateral Sixth Nerve Palsies in the Absence of Headache: A Case Report 2024 ·Case Reports in Ophthalmology ·(unknown), Hiroshi Okada, (unknown), Yoshiaki Shimada, Atsuhiro Tanikawa, Masayuki Horiguchi, Yasuki Ito	0
4	Incidence and predictors of ventilator-associated pneumonia using a competing risk analysis: a single-center prospective cohort study in Egypt 2024 ·BMC Infectious Diseases ·(unknown), Akira Kuriyama, Yoshihito Goto, Yoshimitsu Takahashi, Mayumi Toyama, Yoshitaka Nishikawa, (unknown), (unknown), Hiroshi Okada, Takeo Nakayama	1
5	Information-seeking behaviour of community pharmacists during the COVID-19 pandemic: an ecological study 2023 ·BMJ Open ·Shota Suzuki, Yoshitaka Nishikawa, Hiroshi Okada, Takeo Nakayama	2
6	Validation of quality indicators for evaluating geriatric pharmacotherapy services in primary care: a mixed methods study 2023 ·BMJ Open ·(unknown), (unknown), Hiroshi Okada, (unknown), Timothy F. Chen	2
7	Study of assessment of knowledge and understanding for coping with sick days among patients with diabetes in community pharmacy: a cluster randomized controlled trial (SAKURA trial) 2023 ·Journal of Pharmaceutical Policy and Practice ·(unknown), Hiroshi Okada, Shota Suzuki, (unknown), Tōru Yamazaki, (unknown), (unknown), Miho Takahashi, Takeo Nakayama	1
8	Knowledge and self-efficacy among healthcare providers towards novel tobacco products in Japan 2021 ·Preventive Medicine Reports ·Swati Mittal, (unknown), Yoshitaka Nishikawa, Hiroshi Okada, Robert A. Schnoll, Yoshimitsu Takahashi, Takeo Nakayama, Yuko Takahashi	7
9	Communication with non-Japanese residents at the pharmacies under the COVID-19 pandemic -Dissemination of information via the website and future prospects 2020 ·An Official Journal of the Japan Primary Care Association ·Shota Suzuki, Hiroshi Okada, Takeo Nakayama	3
10	Chromosomal Characteristics of Oxygyne shinzatoi (Burmanniaceae), and its Phylogenetic Significance 2007 ·Hirokazu Tsukaya, Masatsugu Yokota, Hiroshi Okada	2
11	Taxonomic Notes on Cayratia tenuifolia (Wight & Arn.) Gagnep., Vitaceae 2007 ·Hiroshi Okada, Hirokazu Tsukaya, (unknown)	3
12	A New Species of Aridarum, Schismatoglottideae, Araceae from the Muller Range, Central Kalimantan, Indonesia 2006 ·Hiroshi Okada	5
13	Didymoplexiella cinnabarina (Orchidaceae) : a New Species from Muller Range, Central Kalimantan, Indonesia 2005 ·Hirokazu Tsukaya, (unknown), Hiroshi Okada	2
14	Germination Response of Seeds of Aconitum grossedentatum (Ranunculaceae) to Temperature and its Significance to the Expansion of the Distribution 2004 ·Hiroshi Okada	1
15	Taxonomy of Globba (Zingiberaceae) in Sumatra, Indonesia 2003 ·Systematic Botany ·Atsuko Takano, Hiroshi Okada	17
16	Inflammatory Cytokines in Sera and Cerebrospinal Fluids from Patients with Herpes Zoster and Postherpetic Neuralgia 1998 ·Hiroto Nakayama, Hiroshi Okada, (unknown)	1
17	Elderly Patient's Capacity for Medication Regimens: Evaluation by Japanese Regimen Adherence Capacity Tests (J-RACT). 1997 ·Rinsho yakuri/Japanese Journal of Clinical Pharmacology and Therapeutics ·Toshiaki Shiomi, (unknown), (unknown), Hiroshi Okada, Tadashi Kobayashi	2
18	Pollination System of Neuwiedia veratrifolia Blume(Orchidaceae, Apostasioideae)in the Malesian Wet Tropics 1997 ·Hiroshi Okada, (unknown), (unknown)	10
19	Development of a Regimen Comprehension Scale. 1997 ·Nippon Ronen Igakkai Zasshi Japanese Journal of Geriatrics ·Toshiaki Shiomi, Hiroshi Okada, (unknown), (unknown), Tadashi Kobayashi	4
20	Flower Visitors of 32 Plant Species in West Sumatra 1989 ·Kagoshima University Repository ·Makoto Katô, (unknown), Mitsuru Hotta, (unknown), Hiroshi Okada, (unknown), (unknown), (unknown), (unknown)	7

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

Explore authors with similar magnitude of impact