Xeomin Potency After Mixing?

While we prefer to use all neurotoxins like Botox, Dysport or Xeomin in the same day that it is mixed, in reality if a practice is not doing enough neurotoxins, then they'll end up using older stock. That said, with all the neurotoxins, using them within 2 weeks should not be any problem as far as potency or duration.  ~ Dr. Benjamin Barankin, Toronto Dermatology Centre 

Although reconstituted Botulotoxin remains potent (albeith with a decline with each passing day) for up to 6 weeks, it is not considered good practice to use medicine not freshly prepared. Doctors should use it on the same day and the same patient.