81 Acta Pharmaceutica Sciencia. Vol. 55 No. 3, 2017 Possible Health Risk of Electromagnetic Fields Acta Pharm. Sci. Vol 55 No: 3. 2017 DOI: 10.23893/1307-2080.APS.05520 *Corresponding author: Ahmet Aydın E-mail address: ahmet.aydin@yeditepe.edu.tr; Tel: +90 216 578 22 42 Teslime Esra Sarı 1 , Feyza Kelleci 1 , Mohammad Charehsaz 1 , Ahmet Aydın 1* 1 Yeditepe University, Faculty of Pharmacy, Department of Pharmaceutical Toxicology, 34100 Istanbul, TURKEY INTRODUCTION Electromagnetic felds (EMFs) Electromagnetic felds (EMFs) are emitted to environment from radio and televi- sion, communication devices such as cell phones, and other electrical appliances at homes and workplaces. EMF composed of waves of electric and magnetic energy moving together through space. It is a type of radiation which is emitted by all cell phones. Diferent types of electromagnetic energy are categorized by their wavelengths and frequencies and comprise the electromagnetic spectrum. Diferent technologies use diferent radiation frequency. During recent years, people exposed to EMF radiation with widespread use of cell phones or their ABSTRACT Electromagnetic field (EMF) is a kind of radiation and is emitted to environment from some medical diagnostic equipment, radio and television, communication devices such as cell phones, and other electrical appliances. It can have some risks to biological systems. There are some published documents on the possible human health risks of it including epidemiologic, in vivo, and in vitro studies. This review article focuses on the advers health effects of electromagnetic fields on reproduc- tive and developmental system, psychological system, nervous system, genotoxic effects, carcinogenesis, ear and vestibular system, ocular system, melatonin pro- duction and circadian rhythms. Although there are some studies which indicated some possible effects on these physiological systems, the data is limited to reach exact conclusion. Further studies are needed to prove safety and biological effects of EMF. Key words: Electromagnetic field, electromagnetic radiation, health risks