Analysis of consumptions has proved a misuse of antibiotics, despite the existence of national requirements. To be able to compute drugs consumption quantities of highly heterogeneous drugs expressed in various doses units, the World Health Organization has defined a defined daily dose. A methodology has been also defined from previous work to compute manually the drugs consumptions in daily defined dose. We automated this methodology by using data fusion on data retrieved from different sources including a French public database and the World Health Organization website. Evaluation proved the efficiency of the approach, except for inconsistency cases. We identified these cases and proposed a solution to avoid them.