Abstract: A pharmaceutical dosage form is disclosed having a breaking strength of at least 300 N and comprising (i) an ephedrine component selected from the group consisting of ephedrine, pseudoephedrine and the physiologically acceptable salts thereof, wherein preferably the weight content of the ephedrine component is within the range of from 0.1 to 60 wt.-%, relative to the total weight of the pharmaceutical dosage form; and (ii) a physiologically acceptable conversion inhibitor that is capable of inhibiting the chemical conversion ex vivo of the ephedrine component into methamphetamine. Also disclosed is a method of treating a disease, disorder or condition, preferably selected from the group consisting of tissue hyperemia, edema, and nasal congestion, comprising the administration of the pharmaceutical dosage form to a subject in need thereof.