The increasing contamination of water with pharmaceutical active compounds over the last years created the necessity to improve conventional water treatment in order to target this new class of pollutants. Electrocoagulation has caught a rising interest for the retention of different contaminations because of its simple technology, which leads to low operational costs. However, this study reveals that its application in the treatment of pharmaceutical wastewaters is just in the beginning and still needs to be investigated thoroughly. Therefore, this attempt has been done by decontaminating synthetic wastewater containing the antibiotic ciprofloxacin with electrocoagulation. The influence of initial pH, initial concentration of ciprofloxacin and current density have been investigated on three levels. The experiments, conducted in a batch-system by dissolution of aluminium electrodes confirmed, that electrocoagulation may be a promising technology in the treatment of pharmaceutical wastewater. A maximum retention of ciprofloxacin of 92 %, based on UV/Vis-spectroscopy could be achieved with an initial pH of 4, an initial ciprofloxacin-concentration of 10 mg/L and a current density of 32.72 mA/cm² after 105 min of electrolysis. Additionally, the adsorption-kinetics were determined to follow a pseudo-second order model with a constant k between 0.0017 and 0.0074 L/(mg*min). The equilibrium-isotherms could be distributed to a Langmuir-model with KL = 0.005 L/mg and qm = 714 mg/g.