Only one injection for 20 units of botox?

Twenty units injected as a single site injection for cosmetic botox seems a little too high. I routinely inject about 15-20 units of botox in the glabella area, divided into about 5 injections. One injection, 5 units, in the midline between the eyebrows. Then I ask the patient to activate the muscles that create the vertical lines, and then I do 4 injections, about 2.5 units on each side, in a "V" pattern. Total is about 15-20 depending on the patient. 

Thank you for sharing your concerns about your recent Botox experience. 20 units of Botox for the glabella is a reasonable treatment, however these units are usually divided into 3-5 injection points depending on the strength of the muscles. Considering the glabella is quite strong and is made up of a collection of muscles, just one injection point would likely not address all of the wrinkle-causing motion in this area. I recommend following up with your injector to discuss your concerns about your treatment. He/she should be able to evaluate you and assess whether or not you need additional injections for a complete treatment. Best of luck.

Although 20 units of Botox is a normal dose to treat the "11's", It is typically not used in one injection site. It is more common to inject it in 3 to 5 injection sites to target the corrugator and procerus muscles.  I hope you find this information helpful.