Under accelerated testing conditions (40 ◦C, 75%RH) but also over a long time (25 ◦C, 60%RH), yellowing of the plastic cartridge was observed. In return, this change in colourwas not observed under the reference condition (5 ◦C). The drug substances analysed could not be used to identify the degradation products for atropine or pralidoxime under any of the conditions studied. The result was different with avizafone. For this reason, a complementary development has been initiated, as this molecule is the least well known