Over the course of history, the advertisement has found new areas and dimensions in which it operates. Currently, in the 21st century, it has pushed the boundaries and strengthened its impact in the life of the contemporary man (Crnković, Markač, 2014: 129), while gradually assuming the status of the most present discourse nowdays. The topic of this research is pseudoscientificality on the example of contemporary Croatian advertisement of over the counter (OTC) drugs. Advertisements of Croatian OTC drugs from three Croatian magazines: Gloria, Men’s Health and Globus ranging from 2010 to 2016 were examined for the use and frequency of pseudoscientifical elements used with the intention to blur the differences between the objective and the subjective and by doing so secure credibility for the advertisement (Stolac, Vlastelić, 2014: 63). Firstly, this paper aims to determine elements of pseudoscientificality in advertisements of over the counter drugs. After that, it aims to establish in which constitutive elements of advertisements they appear. Another goal is to examine the illocution and the perlocutionary force of pseudoscientificalic elements in a given advertisement, in other words, the intention and the success rate of accomplishing that intention. The corpus consists of 376 advertisements for over the counter drugs. Textlinguistic and multimodal analysis have been used, as well as a questionnaire. By means of a questionnaire, the perlocutionary effect of the pseudoscientifical elements in advertisement has been examined. The sample included 50 male and female students from ten faculies of the University of Zagreb aged from 19 to 22