Can I know if I received a placebo or an experimental product ?

Some of our studies may include a placebo group. A placebo is an inactive substance administered to the volunteer instead of the experimental drug, and against which the efficacy of the drug is tested. If you take part in a double-blind study, neither you nor the medical team will know to which group you have been assigned and whether you have received an experimental product or a placebo.

It is only at the end of the study, when all observations and analysis have been completed, that the composition of each group is disclosed to allow for statistical processing of the data.

The double-blind design of a study helps prevent biases of interpretation based on the “absolute conviction” of the volunteer.


Division of Immunology and Allergy
Vaccine and Immunotherapy Center
1011 Lausanne, Switzerland
Tel.: +41 21 314 1160 / +41 21 314 1163
Fax: +41 21 314 1161
Monday to Friday: 8 am - 6 pm
 Dernière mise à jour le 11/04/2019 à 15:39