Pre-exposure prophylaxis is a new strategy to prevent the occurrence of new cases of HIV. This prophylaxis strategy is based on taking antiretroviral drugs (ARV) before and after exposition to a risk of HIV infection which can reduce drastically the contamination with HIV. A certain groups of population based on their sexual orientation, for instance man who have sex with man (MSM), is among the groups that are highly exposed to this risk. To reduce this risk, French national regulatory authority (ANSM), firstly through temporary usage recommendation followed by a marketing authorization extension, allowed the prescription of these antiretroviral molecules to persons presenting eligibility criteria as defined by regulatory authority. Despite these preventive measures, the incidence of HIV such as the MSM group still high. The missed opportunity studies has as objectives to try to disentangle real obstacles of PrEP use in France and to optimize PrEP criteria if needed.
