Did Dysport cause a reaction two days later than led to flu-like symptoms, leg numbness, and lower back pain?

Hello, and sorry to hear about the issues you are experiencing following your treatment. From what it sounds like, these side effects may actually be associated with influenza or another condition that needs treatment, and are not consistent with issues patients may experience after Dysport. This is especially the case with the numbness in your leg and problems balancing. In general, Dysport does not do the following:

1) Migrate through the body
2) Cause any systemic side effects

I would recommend following up with your physician who performed your Dysport treatment, and report the problems you experienced. Any additional tests should be performed as recommended. This will ensure you are getting the necessary treatment to improve your condition. I hope this helps, and feel better!

We have had patients describe flu-like symptoms after Botox and Dysport in the past.  The problem is that it is difficult to tell if there is any relation because it happens to infrequently.

The other issues you are describing that involve the leg and low back would not be related.

Dysport is injected locally to a specific area and does not travel systemically throughout the body.  While it is possible to get headaches after a Dysport injection, it would be difficult to explain the symptoms in your back and leg.  If you haven't already, I would consult with a neurologist, as your symptoms could possibly be caused from something other than the Dysport.