I have not had any patient nauseated after 16 years of treating patients with Botox. I agree with Dr. Wallach. The Nausea may come from fear or anxiety during the procedure or due to some other completely unrelated reason.
If you get nausea from Botox, it may just be due to the fear of th einjection process itself. This usually goes away prety quickly from keeping your head down a bit and drinking some water.