Can DMSA expire?

About a month ago I ordered some DMSA and was going to start chelating immediately but then came to the realization that I should probably strengthen my organs first, so I've decided to parasite cleanse, bowel cleanse, kidney cleanse etc. beforehand. When I feel I am ready to chelate, which would probably be within the next 3 months, will my DMSA supplement still work? It was pretty expensive and I don't want it to go to waste or waste my time waking up in the middle of the night to chelate in a few months from now.