Can Someone Tell Me How the Charges Are Made for Botox?

There are different techniques to injecting botox or dysport to get different results. Also the size of the area or how dynamic the muscles are helps determine the amount of botox to use. Men have larger foreheads and need a lot more botox than women as a rule. What is important is the results you get so don't go cheap or you are wasting your money and will pay more in the long run to get touch ups which are not free.
When your doc charges by the unit, you have no idea going into it how many units your doc feels you will need to accomplish the results you want. You yourself will under estimate the amount of units you need by such an amount that you will be shocked when you pay your bill, whereas if you know you want the crow's feet or frown lines or forehead creases done, then if your doc charges by the area then you know exactly what you are going to have to pay and you can plan accordingly with your money whether you can afford it or not right now.
It all boils down to your results and your doctor patient relationship. Even if he does a great job most of the time, there will be a 1 out of 10 times when the botox doesn't seem to work as well and a touch up is needed even in the best of your hands.

Generally, clinics provide a per unit price, and you simply multiply that amount with the number of units administered during treatment. I haven't heard of charging per syringe.

Dear Jlosc
BOTOX (and now Dysport) are very technique dependent services. The standard treatments are only so good. Advance injectors will individualize treatments. At the low end of the market, injectors are advertising BOTOX by the unit at prices that are less than the cost of the material. Obviously no one can stay in business giving things away so there is usually a check (including giving you less BOTOX than you pay for). Other office will charge by the area. Recognize that there is no general agreed definition of what is an area. Certainly you want to know exactly how much BOTOX you will be receiving whether the office charges by the area or by the "syringe". Treatment priced by the injection is just another variation on this theme.
It is my personal belief that not all BOTOX treatments are the same. As an injector, I do not expect that my patients will know how many units of BOTOX they will need, or what areas they should be treated in. It is my approach to offer BOTOX as a service. We also tell the patient exactly how many units of BOTOX they are being treated with so that if they get service elsewhere they know what was done before. It is worth noting that you are best served if you are treated by the doctor and look for a doctor from the aesthetic speciality core: Dermatology, General Plastic Surgery, Otolaryngology, Ophthalmology.

It varies significantly from office to office. The most important aspect is to choose a reputable and experienced injector. Some will charge you by area and some like us will charge you by unit.  In our case, it is $12/unit. 

I agree that you should be charged by the UNITS, not the area. Some areas simply require more units, and that is directly proportional to our cost. On the other hand, there is usually remarkable consistency in the number of units needed--usually around 30 per area. We do quote by the area for that reason. It is very consistent for our staff and patients...no ambiguity. As a patient I would always wonder: did I "need" more units because I was dressed well and looked like I could afford it? Of course, if someone truly needed LESS units, I would adjust my fees lower. I NEVER adjust them higher!

Syringe pricing is for fillers. Botox prices depend on several factors: the number of units required, as well as the experience of the doctor (you get what you pay for...). Dilution, syringes, and volume mean nothing. It is the amount of toxin injected and where and the expertise of the injector that determines fair pricing. A few doctors charge by the area, but that is hard to do since some patients need 20 units where other patients need 45. You want your charges to reflect what you need and what is done in order to be fair.

The fairest way to pay for BOTOX is by the unit. Because different people have different requirements in each area, it's best to pay for exactly what you use. If you have a weak frown muscle, why should you pay the same price as someone who has a very strong muscle (which requires more BOTOX units). The way that the physicians are billed is by the unit by Allergan as well.
When you pay by the area, you don't always know how much BOTOX you are getting. If you pay per syringe, that's variable too. Because BOTOX comes as a powder, it requires the physician to add saline so it is able to be injected. If all physicians used the same reconstitution mixture, than you could compare apples to apples when you compared syringe prices. This is not the case. Doctors add 1-5cc to the bottle of Botox, depending on the physician's preference. When you pay per unit, it really doesn't matter to you how much is added, because the physician makes the calculation as to how much he needs to inject to get that certain amount of units that's right for you.

All of my colleagues and I either charge by the unit or by the area. I charge by the unit because it is an absolute, quantifiable measurement of how much botox you are receiving. Furthermore, if you as a patient know how many units were injected into a certain area, you can use the response as a gauge of how many units you should receive in that location in the future.
I hope I have not confused you. Good luck.

Botox is typically charged per injection area, ie glabella, forehead or crowsfeet, for instance. Some doctors charge per unit of botox injected and perhaps some doctors charge "per injection site". Given the price, I think you mean per injection area as described above. One area, for instance, will have several injection sites.
Regardless, I think you are confusing charging for fillers which is typically by syringe with the way charging is done for Botox.

Botox can be charged by unit or by the area to be injected.
However, how you are charged is not as important as having an experienced
injector. I believe that Botox is best performed by a skilled and knowledgeable
physician, because he/she understands anatomy.

Our
clinic typically charges by the area, and we guarantee
our results, so you do not pay if you would like a top-up on your
Botox (i.e. additional units in that same area) after the results take effect.
This works extremely well, and we have a high level of patient satisfaction
using this method. In contrast, patients who pay for Botox by the unit often
wish they had gotten a little bit more, but will have to pay additionally per
unit at the Botox provider they went to.