Team
Meet our team
Borislav Borissov MD, PhD, DMSc
Education
Dr. Borislav Borissov graduated medicine with distinction at the Medical University – Sofia, Bulgaria in 1990.
Specialization
Until 1998, he worked as a consultant at the Department of Anaesthesiology and Intensive Care, as well as a visiting fellow at Hôpital La Pitié-Salpêtrière in Paris and Addenbrooke’s Hospital in Cambridge, UK. The results of his research there have been published in leading world journals. From 1998 to 2004, he was the director of the Bulgarian Drug Agency (BDA).
Experience
Since 2004, Dr. Borissov has been engaged in international drug regulatory consultancy, management of dedicated clinical research sites, and health technology assessment. He was elected Chairman of the Bulgarian Association of Clinical Research (BACR) for the term 2019-2022. He holds a PhD in Medicine (1997), a Master’s degree in Business Administration (2002, City University, Seattle, WA), a degree in Health Management (2015), and a Doctor of Science (DSc.) degree (2018). He has been an associate professor at the Faculty of Public Health, Medical University Sofia, since 2020. Dr. Borissov is an author and co-author of books, scientific monographs, and peer-reviewed articles, which have been cited over 300 times in Scopus and Web of Science (H-index 6).
Emilia Apostolova MPharm, PhD
Education & Specialization
Emilia Apostolova graduated pharmacy at the Medical University – Sofia, Bulgaria in 1989.
Emilia holds PhD in phytochemical analysis (1993) from Bulgarian Academy of Science. Results of her research there have been published in leading scientific journals with impact factor >6.
Experience
From 1993 to 2005 she worked in Bulgarian Drug Agency (BDA) as analyst in laboratory for quality control (1993-1998) and head of department in Marketing Authorisation Directorate (1998-2005).
During her tenure at the BDA she was a Member of Herbal and Homeopathic medicines Committee at Ministry of Health /2000-2005/.
Joining Prescriptia In 2005 as project manager “Chemical-Pharmaceutical Documentation” Emilia has been engaged in international drug regulatory consultancy, product lifecycle management and dossier assessment with focus on quality (Module 2.3 and 3). Emilia has been registered as Qualified Person for batch certification and release (2009-2025).
Mariana Stoykova MD
Education
Mariana Stoykova is a medical doctor. She graduated from the Medical University of Sofia in 1996.
Specialization and Experience
From 1997 to 2000, she worked in the pharmaceutical industry as a Medical Representative. Between 2000 and 2010, she served as a Clinical Assessor at the Bulgarian Drug Agency (BDA), gaining extensive experience in the regulatory evaluation of medicinal products and in EU pharmaceutical legislation.
Mariana has over 20 years of professional experience in regulatory affairs, clinical trials, medical and safety writing, health technology assessment, and pharmacovigilance.
Mariana joined Prescriptia in 2010 as a Medical Manager, where she focuses on regulatory strategy, marketing authorisation dossier evaluation (Modules 4 and 5), clinical trials, health technology assessment, medical writing, and pharmacovigilance. In 2012, after successfully fulfilling all required regulatory and competency requirements, she was registered with the EMA as an EU QPPV.
Iveta Georgieva MPharm
Education and Specialization
Graduated from the Medical University of Varna, Bulgaria, in 2023 with a Master of Pharmacy.
In 2025, she obtained a Master’s degree in Clinical Trial Management from Medical University of Sofia, Bulgaria.
Certified in GMP, GCP, GDP, GcLP, GDocP and Data Integrity (2025)
Experience
Iveta joined Prescriptia in 2024 as a Project Assistant in the CMC Unit, supporting CTD preparation and review, dossier due diligence, and product life-cycle management across regulatory projects, including national procedures, as well as DCP and MRP.
In addition to her regulatory affairs responsibilities, she contributes to QA activities in line with applicable GDP standards. Iveta also has hands-on experience in clinical trials as an unblinded pharmacist, ensuring proper management and accountability of IMPs in compliance to study protocols.
Yoana Cholakova, MD
Education and Specialization
Dr. Yoana Cholakova is a medical doctor with an international academic background across the United States and Europe. In 2026, she earned her Doctor of Medicine degree from Medical University – Sofia and, in 2019, obtained a Bachelor’s Degree in Human Biology from Macaulay Honors College at CUNY Hunter College in New York.
Experience
Her background combines clinical training in internal medicine with academic research experience at the Bulgarian Academy of Sciences since 2024, where she contributed medical expertise to interdisciplinary scientific projects. Having studied and worked in different healthcare and academic systems, she brings strong analytical skills, scientific rigor, and cross-cultural perspective to her work.
At Prescriptia, Dr. Cholakova supports medical and scientific pharmacovigilance activities, including literature assessment, medical review of safety information, contributing to high-quality and evidence-based PV support for clients.
Ivan Ivanov MPharm, EU QPPV
Education and Specialization
Ivan Ivanov obtained a Master’s degree in Pharmacy from Sofia University in 2020.
In 2022, he acquired qualification as an Internal Auditor of Quality Management Systems, in accordance with ISO 9001:2015 and ISO 19011:2018, with a focus on compliance assessment and quality system evaluation.
From 2022 to 2025, he completed a Specialization in Pharmacology and Pharmacotherapy at the Medical University of Sofia.
Experience
Ivan has more than 4 years of experience in Quality Assurance and Auditing, having conducted over 50 audits across more than 10 countries.
Following successful completion of the XEVMPD knowledge evaluation and ISO/ICH E2B (R3) ICSR training for the EU in 2024, he assumed the role of Deputy EU QPPV.
He joined Prescriptia in 2026 as a Pharmacovigilance Expert and EU QPPV. With more than 2 years of hands-on experience in pharmacovigilance, he is actively involved in EU PV system maintenance, ICSR submission, XEVMPD product registration, PSMF and RMP management, as well as ongoing PV system oversight.