How long until Dysport wont migrate or move? I am currently undergoing TMS (transcranial magnetic stimulation) for depression.

I would follow up with your injector about their recommendations. 48 hours should be a good timeframe, but it can take up to 2 weeks for final results. Hope this helps.

The final results from a Dysport treatment can be seen at two weeks post injection. It is doubtful the product would migrate after a few days but there's no solid proof of that. When in doubt check with your injector.

I would recommend you wait 24 hours after your injection before resuming your TMS.  As a general precaution, I usually recommend my patients refrain from any extra activity for 4 hours following Dysport injections and avoid strenuous activity for at least 24 hours.  
That being said, if you still have concerns about your treatment, I would recommend following up with your doctor to discuss any and all questions or concerns you have.

I would imagine that 48 hours is enough time after a treatment, but this is not based on medical studies that have been done.  I'm sure you can imagine it would be difficult to study, as not many people would sign up for a study that involved trying to provoke a risk of treatment.  I have my patients resume their normal activities after 48 hours, and I do not know that adding more time to this limitation is beneficial.  Good luck!

This is an interesting question and to be honest I don't have a great scientifically proven answer for you. However, what I can say is that the full effect of your dysport can take up to a maximum of 2 weeks to set in. If you can safely wait two weeks until your next TMS treatment you can definitely be sure it would not change the results. Whether it can be done sooner than that I cannot say for sure. Common sense tells me it would be fine after 2-3 days but to be 100% sure two weeks would be more than adequate. Hope this helps.