Botox is a botulinum toxin that has been in use since the later 1970's although Botox popularity surged with the anti aging movement of the late 1990's . The injection of Botox results in a paralysis of a specific muscle, the lack of muscle contraction leads to less wrinkling of the skin above that muscle. Hence the anti aging effect.
Botox is injected in the same areas as Dysport with the same initial results however, Dysport seems to last slightly longer than Botox injections.
Botox injections for lower lid lines is a newer area but caution must be observed because you are injecting near the muscles responsible for lifting the mouth corners. Botox under eye injections can reduce those fine lines between the lower lid and upper cheek.
Botox is dosed in units as opposed to milligrams as we are used to seeing in pills. Different areas of the upper face require different doses normally 2 - 5 units per injection site of Botox.
Botox injections have been used in the axilla to treat excess sweating. 50 units are placed in each axilla, the reduction of sweat ranges for 18-100% and lasts nearly a year.
The cost of Botox varies depending on the injectors degree, level of expertise and location in the country. The average cost per unit ranges between $ 12 to about $20.