There should be no mystery regarding how many units of BOTOX you are getting. If your doctor won't provide this information or you do not trust that you are getting what you are being told, move on to a new doctor. There are some office that play a big game with how many units of BOTOX they use for the very simple reason that the medication is very expensive. The more saline they inject and the less BOTOX, the more profit. Not that there is anything wrong with profit, it just that you should know what you are paying for. So, if the same "amount" of BOTOX seems much more effective in one office than another, that is a pretty good sign that someone is pulling your leg. If a treatment price seem too good to be true and the service only lasts a few weeks, it is not that you are "immune" to BOTOX, it is much more likely that you are getting ripped. So be aware, that super good price for BOTOX by the unit is only good if you actually get the product you paid for.