Realization of prepositions and prepositional phrases in professional medical texts in English may affect the proper selection of certain prepositions. Also, the use of prepositions is affected by literal translation into English. Today, the English language is the basic language for communication in biomedical sciences, and one of the problems that arises is the proper use of English by scientist non-native English speakers. A review of randomly selected medical professional journals and papers identified some typical misuse of prepositions that can be caused by different realizations of prepositions.