The present invention proposes a stable triflusal compound powder for oral administration solid pharmaceutical forms, which contains, as a stabilizing excipient, at least one cyclodextrin selected from: β-cyclodextrin, α-cyclodextrin, dimethyl-β-cyclodextrin, γ-cyclodextrin, 2-hydroxyethylcyclodextrin, and mixtures thereof. The mentioned triflusal compound powder is used for producing granules, tablets or sachets. The mentioned triflusal compound powder is prepared by dry preparation.