Dear Location 98004,
It is important that you are aware of what works for you. Unfortunately not every office is honest about how much BOTOX you are getting in a syringe. The product comes dry in the vial and then is reconstituted by the doctor. Typically office use 2.5 to 4 milliliters of saline to dilute the BOTOX. However, some office dilute much more. I am aware of one office that dilutes their BOTOX with 20 ml of saline so each syringe contains just 5 units of BOTOX. This office offers free touch ups if you are not happy with the results but then there is essentially no BOTOX in the syringe. In Los Angeles, it is also clear that some offices sell BOTOX by the unit but do not actually give a full unit. The product is very expensive so it should not be surprising that this goes on.
It is important to recognize this. Be certain when you are treated that you find out how many units of BOTOX you are being treated with. Write this down and keep track. That way if you go to another office and they claim to treat with the same amount of BOTOX, you can compare treatment effects. Treatment effects should last about 4 months. Results that only last a few weeks are the results of inadequate amounts of BOTOX. If you have had good results with one office but results that only last a few weeks at a second office or on a second service at the original office suggest that less product was used.
Finally with regard to comfort. Diluting BOTOX with preserved saline is slightly more comfortable that unpreserved saline. I tend to use numbing cream on the skin an unpreserved saline. Occasionally, individuals have allergies to the preservative so I avoid this type of issue using unpreserved saline. However, the discomfort you are describing is the results of diluting the BOTOX with sterile water. The sterile water is hypotonic and it pull salt out of cells and this results in profound discomfort like someone stuck you with a rose thorn. Only bozos dilute their BOTOX with sterile water (my apologies to BOZO the beloved television clown).