Botox already opened, safe practice?

This can depend on the size of the vial. Each Doctor will have their preferred method regarding needles, but as long as they are sterile, this is fine. If you have any concerns, I recommend following up with your injector. Best, Dr. Emer

Most Botox vials are either 50 or 100 units and so it is not uncommon to use the same vial for more than one patient. I always use a different syringe to draw up the Botox from the one I use to inject it. I use a 33g needle to inject which is very small. It would be dull and more painful if I also used that needle to inject. I also use different syringe and needle for each different area that I inject as I sometimes use different concentrations of Botox in different areas.

To maintain sterility, only a sterile needle and a sterile syringe should be used on a botox vial from multiuse draw.  This is the only way to avoid contamination.  If you are describing someone who is changing needles on a syringe already used to inject you and then entering the botox vial, this is not sterile technique and will result in cross contamination.  Don't use offices that cut corners on your safety.