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Drug promotion and advertisement by pharmaceutical industry influence medical prescription and, in some cases, the information provided is incomplete or biased. The objective was to analyze the advertisements delivered by medical representatives and determine if the information was appropriate for rational prescribing. It is a prospective study (March to November 2018) by collecting print advertisements randomly received in neurology centers. It was evaluated if they met the ethical criteria established by the WHO, using as a reference leaflets from Administración Nacional de Medicamentos, Alimentos y Tecnología Médica (ANMAT), Food and Drugs Administration (FDA) and pharmacology books. A committee of pharmacology physicians analyzed if the content of the pamphlets was misleading according to the WHO. Sixty advertisements were analyzed, being anti-epileptics and antidepressants the most advertised drugs. The 33.3% (n = 20) of them included leaflets in accordance to ANMAT. One case presented an "off-label" indication. Drug action was presented in 31.7% (n = 19) of the pamphlets, adverse reactions in 40% (n = 24), posology in 45% (n = 27), contraindications in 38.3% (n = 23) and the necessary precautions in 36.7% (n = 22) of them. The information provided was false in 80% (n = 48) and 53.3% (n = 32) contained misleading images; and 69.2% (n = 18) of the graphics were false. The information provided by medical advertisements analyzed in this study would be insufficient to know and prescribe a new drug. Lack of information in posology, contraindication, drug action and adverse reactions do not contribute to rational use of medications.