The present disclosure relates to a container (19) for the production of a foamed sclerosant composition, to kits and systems including such a container (19), to methods for preparing a foamed sclerosant composition using such containers, and to foamed sclerosant compositions obtainable by such methods. In an aspect, the container (19) comprises a sealed sterile container body having one or more sidewalls extending between a top and a bottom of the container body and defining a foaming space (21). The container (19) further comprises a mixing element disposed in the container body. The container (19) contains a previously introduced gas and liquid sclerosant composition. The mixing element is configured to be operatively coupled with a rotatable actuator without the actuator reaching the foaming space (21). A medical professional may select the appropriate quantity and concentration for every treatment.
