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Dr. L.E. (Loes) Visser

Associate Professor

  • Department
  • Hospital Pharmacy
  • Focus area
  • Pharmaco-epidemiology, Drug utilization, Drug-outcome research, Pharmacogenetics


Education and career

  • PharmD, RUG, 29-6-1995
  • MSc Clinical Epidemiology, NIHES, Erasmus University, 20-6-2003.
  • Registration as Epidemiologist B, 30-1-2006
  • Dept. Pharmacy, hospital St. Jansdal, 1995-1996.
  • Dept. Pharmacy, Radboud UMC, 1996.
  • Apotheek Haagse Ziekenhuizen (AHZ), hospital pharmacy resident, 1996-1999.
  • Dept. Pharmacy, Erasmus MC, 2000-2013
  • Dept. Epidemiology & Internal medicine, 2000-2020
  • Dept. Pharmacy, Haga Teaching hospital, 2013-now
  • Dept. Pharmacy, Erasmus MC, 2021-now.


Teaching activities

Thesis supervision:

  • Claire Siemes, Erasmus MC, Rotterdam. Title thesis: “New insights into genetic variation and cancer” (May 9, 2007).
  • Matthijs Becker, Erasmus MC, Rotterdam. Title thesis: “Individualizing pharmacotherapy. Genetic factors and co-prescribed drugs affecting pharmacotherapy” (Nov 4, 2009).
  • Monique Bijl, Erasmus MC, Rotterdam. Title thesis: “The influence of the CYP2D6*4 polymorphism on drug response and disease susceptibility” (Nov 20, 2009).
  • Martina Teichert, Erasmus MC, Rotterdam. Title thesis: “Pharmacogenetic aspects and drug interactions in anticoagulation therapy with coumarins” (Feb 18, 2011).
  • Rikje Ruiter, Erasmus MC, Rotterdam. Title thesis: “Pharmaco-epidemiology as a tool in Pharmacovigilance: studying cancer as adverse drug reaction” (Feb 1, 2012).
  • Eline Rodenburg, Erasmus MC, Rotterdam. Title thesis: “Sex differences in cardiovascular drug response” (Sep 18, 2012).
  • Catherina de Keyser, Erasmus MC, Rotterdam. Title thesis: “Pharmacogenetic Epidemiology of Statins in an Ageing Population” (Jun 5, 2015).
  • Raymond Noordam, Erasmus MC, Rotterdam. Title thesis: “Pharmacoepidemiological studies on antidepressant use in older adults” (July 3, 2015).
  • Nikkie Aarts, Erasmus MC, Rotterdam. Title thesis: “Utilization and unintended effects of antidepressants in an ageing population” (Dec 16, 2015).
  • Kiki Cheung, Erasmus MC, Rotterdam. Title thesis: “Medication use in children and adolescents. Studies using different information sources” (May 12, 2020).

Ongoing thesis supervision:

  • Edwin Brokaar, Haga Teaching hospital: medication optimisation and medication safety in elderly cancer patients.
  • Linda Hendriksen, Erasmus MC, Rotterdam: sex as a risk factor for serious adverse drug reactions.


  • Course on research methodology for hospital pharmacy residents (CORAZ), NVZA, once a year.
  • Teaching program Clinical pharmacology for residents in paediatrics and in hospital pharmacy, Haga Teaching hospital.
  • Module ‘Gender-specific pharmacotherapy’, Master Farmacy, LUMC, once a year.

Other positions

  • Hospital pharmacist Haga Teaching hospital, responsible for clinical trials, research & teaching.
  • Board member MSC (medical staff), Haga Teaching hospital.
  • Secretary scientific committee NVZA (CWZO).
  • Board member CGR.
  • Clinical pharmacologist in training, Haga Teaching hospital.

Scholarships, grants, and awards

Grants (principal investigator):

  • ZonMw, Gender and Health, 2017, €169.000
  • KWF, Beleidsproject kanker en ouderen, 2015, €88.100
  • ZonMw, Priority medicines Ouderen, 2010, €570.000
  • Min. VWS, patient safety program, 2004, € 150.000.


    Grants (co-investigator):

  • Hartstichting, sekse-specifieke werking cardiovasculaire gnm, 2017, €104.662
  • NWO, Maatschappelijk Verantwoord Innoveren (MVI), 2015, €235.000
  • ZonMw, Dure en Weesgeneesmiddelen, 2010, €434.349.



  • Sanofi Award for best original research paper NVZA, 21-10-2013
  • Pierre Wijermans award for best scientific department, 2018, Haga Teaching hospital.
  • Corrie Hermann award 2019, VNVA.

My Groups