Patient and Drug Safety

Reporting an Adverse Side-Effect

Humans vary in their biological reactions to medicinal products. This is why not all adverse reactions (side effects) associated with the use of medicinal products can be detected during clinical development, not even by the most comprehensive clinical trials. Capturing as many of these adverse reactions, however rare they may be in absolute terms, from worldwide sources is of paramount importance for continued patient and drug safety (pharmacovigilance).

For Bayer as a global pharmaceutical company, pharmacovigilance takes center stage, beyond mere compliance with worldwide regulations. To enable Bayer to provide up-to date safety information on Bayer products, your support is pivotal, whether you are a customer, patient or healthcare professional.

If you would like to report an adverse event including side effect on Bayer Pharmaceuticals, Consumer Health or Radiology products, please do so by clicking the following link:

You may also wish to contact your health care professional or local health authority.

Reporting a product quality complaint

If you wish to report a quality complaint of Bayer Pharmaceuticals, Consumer Health or Radiology products, please send an e-mail to


Bayer's Crop Science division helps to make the agricultural economy more productive thus contributing to society by helping to ensure an ample supply of high-quality food, feed, fiber and renewable raw materials. To contact us, please send an e-mail to

Animal Health

At Animal Health we are passionately caring for the health of companion as well as farm animals by providing innovative medicines and tailored solutions to veterinarians, farmers, and pet owners. To contact us, please send an e-mail to


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