How do you know if you have botox poisoning?

Although Botox is actually botulinum toxin, the amounts used to inject the muscles of the forehead and beneath the scalp to treat migraines are so minute that it is virtually impossible for you to suffer "poisoning" from such a treatment.  Another factor arguing against any sort of "poisoning" from your treatment is that the Botox is injected directly into the muscles being treated, rather than systemically.  When patients do have reactions to Botox injections, which is extremely rare, they are usually allergic reactions to the preservative used with the Botox, rather than the Botox itself.  Given your symptoms of  light headedness and generalized fatigue, it is far more likely that  you are suffering from some sort of viral syndrome, or other etiology.  I suggest you follow up with your primary care physician for a thorough evaluation.

It's unlikely that Botox is causing these symptoms. If they persist, I recommend following up with your Doctor for a formal evaluation. Best, Dr. Emer