The present invention relates to stable fixed dose topical formulations comprising an antiacne agent and an antibiotic, which exhibit storage stability at a temperature of about 40° C. and relative humidity of about 75% for a period of at least 3 months. Particularly, the present invention relates to stable fixed dose topical formulations comprising therapeutically effective amounts of (a) adapalene-containing microspheres and (b) clindamycin, a process for their preparation thereof and their use for the treatment of acne.