What Happens to Left over Botox?

In our busy cosmetic practice, each patient's amount of Botox needed for their treatment is drawn, in a sterile fashion, out of the Botox vial. If there's not enough units left in that vial, a new one is opened to add to that volume. The Botox treatments are so numerous per week that one bottle doesn't last long at all. The cost of Botox varies based on the number of units used, the location on the face or body (some require more skill and technique), the physician and the geographic area. Each area is usually several hundred dollars and may last four to five months, possibly less.

Many years ago, Botox was reconstituted and used in one day. We were told by the company and the FDA that it was only good for that day so we would gather up all our Botox patients and inject all of them one day a week or month. Any leftover was either discarded, given to the last patient or used on a staff member. Since them we have found that Botox is good for weeks once it is reconstituted from the freeze dried for4m it comes in.
As for pricing, most doctors charge by the unit, some by the region. Prices vary from city to city. Prices also vary according to skill and experience. You can surely get discount Botox from someone who just finished a weekend course and is looking to build a Botox practice. But do you want someone learning on you? Like all of cosmetic surgery, if you want quality results it may cost more.