Aim: The majority of medicines used in Poland are generic drugs and substitutions of the originals. The objective of this study was to obtain information on the current knowledge about generic medicines among Polish patients with epilepsy. Material and Methods: The conducted study was based on a self-developed questionnaire. The questionnaire consisted of 26 questions, including the questions regarding the respondents’ knowledge about generics, their previous experience, and the factors behind these choices. Results: Overall, 1220 questionnaires were analyzed. Among all patients, 66.4% reportedly had heard about generics. Of these, 61.5% of patients had used generic drugs in the past. A significant proportion of participants had never been recommended to switch to a generic medicine by their healthcare professional (23% physicians and 13.9% pharmacists). Statistically, relevant differences were observed regarding the respondents’ kind and level of education, place of residence, and net income per household. Conclusions: Significant gaps were identified in the knowledge and perceptions among patients regarding generic medicines, especially in relation to their efficacy and safety. Efforts must be directed towards increasing public awareness of generic medicines and there should also be a focus on educating patients about generic medicines.