A double blind, comparative, parallel and randomized clinical trial was used for evaluation of two nootropics with anti-aging actions: Meclofenoxate (MF) and Antagonic-Stress (AS). Sixty-three old persons divided into 2 groups (average age: 68.6 and 70.8 years, respectively) with senile dementia of Alzheimer type (SDAT), of mild to moderate intensity (criteria of DSM-III-R, APA, 1987; and ICD-10, WHO, 1990) were treated with one of these nootropica. Baseline and final psychogeriatric symptomatology after three months of treatments were multiply assessed: psychogeriatric by Sandoz Clinical Assessment-Geriatric scale, Self-Assessment Scale-Geriatric and their subscales; psychometric by Wechsler Memory Scale and Wechsler Adult Intelligence Scale. Prolonged treatments with MF and AS significantly decreased the psychogeriatric scores in scales and subscales, improved the cognitive performance (attention, concentration, memory, performance IQ, full IQ) and diminshed the deterioration index (ANOVA). Therapeutical effects of AS (a neurometabolic complex containing MF) were significantly superior against MF alone (ANCOVA). MF and AS actions are discussed in connection with the brain cholinergic system, lipid peroxidation and free radical scavengers, deceleration of the aging rate, brain and erythrocyte lipofuscinolysis, multiple anti-oxidant formula, multivitamin and multimineral supplementation and with the superiority of multitherapy versus monotherapy in senile dementia and for improving the IQ and the maladaptative behavior.