Faced with the events arising from the actions against the Covid-19 pandemic in Brazil, this present work proposes an analysis of the practices and speeches of the government regarding the confrontation of the virus through the identification of denialist strategies used by it. Thus, with the objective of understanding how this movement influenced government actions during this period, principally in the choice of using chloroquine as the main course of action, and its impacts both on public politics and opinion as on the state institutions. The work analyses the speeches and practices of Bolsonaro and his government to understand how denialism was articulated in order to promote the use of a medicine prove ineffective, with that, impacting the effectiveness of sanitary and nonsanitary measures to combat the pandemic.