A method of treating viral disease, in particular HIV/AIDS, comprises concomitant administration of GnRH or GnRH analog including pharmaceutically acceptable salts thereof in an amount sufficient to maintain in the patient an elevated unphysiological plasma level, in particular a castrating plasma level, of GnRH or GnRH analog, and of one or several natural, semi-synthetic or synthetic sexual hormones in a amount sufficient to compensate for the castration effect of GnRH or GnRH analog. Also disclosed is a corresponding pharmaceutical composition and a composition kit, and uses thereof.