Almost everyone has now heard of the facial wrinkle treatment, Botox. While some may not know exactly what it is really good for, its recognition and popularity is because it simply works. When it comes to softening facial expressions, it does something that even surgery can’t do.
Many misconceptions exist, however, about Botox (and now Dysport) and it is time to reveal some of its secrets. Here are some facts about its use that are not commonly known.
Botox is a poison and can be quite lethal if the dose is high enough. It is administered in units which originally stood for mouse units. A unit was the dose of Botox that could kill a mouse. Fortunately, there is a big difference in size between a mouse and a human. To poison a human, it is estimated that it would take about 25,000 or more units to do so. The average dose for wrinkles is around 20 to 30 units, so it is well within the margin of safety. (mathematically, cosmetic dose units are a mere 0.001% of the doses that could be fatal). Cosmetic injections are precisely placed 2 to 4 unit doses in select facial area.
While Botox is touted for a lot of facial uses, it is largely a ‘northern’ face procedure. The areas of the forehead and around the eyes accounts for much of its use. Weakening of the muscles between the eyebrows, in the forehead, and at the sides of the eyes produces the desired effect of less frowning, a more relaxed forehead, and less lines around the eyes. While some do use it down south around the mouth, it is not effective as a primary wrinkle reducer in that area. A little too much Botox there can affect the way you smile.
Botox injections do not produce immediate results. It usually takes one week or more to see its effects. This is because it blocks the release of chemicals from the nerve endings that cross over to stimulate the muscle fibers to which it is attached. Because there is a supply of chemicals in the nerve endings to start, they must first be depleted. As a result, the muscle will work normally for a few days before it begins to weaken as its ‘gas supply’ diminishes.
The effectiveness of Botox can vary from one doctor to another or from one treatment center to another. This seems initially unusual because one of the benefits of a prescription drug is that it has been tested and approved for the uniformity of its effects. But Botox differs from a pill and many other prescription medications. It comes as a dry powder and must be formulated or reconstituted prior to treatment. How well it works, therefore, is affected by how it is mixed and how long ago it was prepared. It is designed to be mixed according to the manufacturers recommendation in a very specific way. (2.5ml of saline per vial) and it should be used either immediately or within a few days after preparation. But treatment centers vary on how they mix it and how quickly they can use it. You have no way of knowing if you are getting diluted or old Botox. If it doesn’t seem to be working well or lasting very long, this could be the reason.
Like all drugs, there is an effective dose to Botox or a ‘sweet spot’ at which it works well. What you want as a patient is to find the Minimum Effective Dose as well as the right injection spots. You may regularly be getting 40 units in the forehead are, for example, when 32 may work just as well. More Botox than necessary does not make it work better or any longer. Don’t be afraid to ask your injector to adjust the does or injection locations to see if the results improve…or become less.
Botox and Dysport have a very consistent duration of effect of around 4 months. Repeat treatments, unfortunately, do not make it last longer. But some patients feel that it does. This is likely an effect of muscle re-education, a chemical training if you will. It may take your body awhile to begin using those muscles again if they have been weakened repeatedly. Conversely, most people will not build up tolerance or immunity to Botox. But a few patients say that they have and resistance to any drug is always possible. One can than switch to Dysport which has a slightly different molecular structure.
Dr. Barry Eppley