Few & Minimal
if you are pregnant or breast feeding
or have neurological conditions.
When used appropriately for the reduction of lines of expression in the upper 1/3 of the face, Botox is incredibly safe. In my experience of 1000's of injections, the most common side effect is a small bruise (<5%). Headaches & swelling (rare). Eyelid or brow drooping (exceedingly rare).