A pharmaceutical product containing papain, bromelain or mixtures thereof is intended for the treatment of several pathologies, such as Alzheimers disease and depression, at a dosage of at least 7000 mg administered in a single dose. This dosage relates to papain powder having a titre of 3 U/mg and bromelain powder having a titre of 2 U/mg, and to a patient with a body weight of 55 kg. In the case of variations of the titre and/or of the body weight of the patient, the dosage must be adjusted in proportion to said variations.