Does anyone know how to effectively treat sciatica and how to work with a client with sciatica i.e. things to avoid?

Joseph,

Sciatic is a general term. It is important to first find out the reason for the sciatic pain and the only one who do this is a physician. Unlicensed fitness professionals are not in a position do determine what is the best approach when iit comes to neurological conditions.

Best to you.