The present invention relates to a pharmaceutical composition (nanosuspension) for a long-acting injectable (LAI) drug for the long-term maintenance therapy of HIV/AIDS. A pharmaceutical nanosuspension for use as an injectable drug for the long-term maintenance therapy of HIV infection is claimed, comprising a composition that contains, as an active ingredient, a compound of general formula 1 in crystalline or polycrystalline form, in which R is C2H5CON-Na+, NH2.