Generally, women desire a relatively slim and beautifully-curved calf. The size of a calf is also determined by its muscle mass. Calf slimming is a procedure to decrease the muscle mass of a calf by injection Botulinum toxin. An alternative method by surgery is available, but the method is yet to develop sufficiently with a high success rate and low complication rate.
Botulinum toxin injection takes 10-15 minutes to perform. This is effective to decrease calf volume. A similar method is performed to decrease the size of muscle on the lower jaw angle, which often causes a square face appearance.
The effect will be seen 2 weeks after injection. A repeated injection will be required after 4-6 months. Calf muscle weakness is a potential complication, which can hinder the ability to walk, run, and tiptoe.
(Source: Prasetyono TOH. Calf slimming. Bazaar 2009 Feb;Chapter 4:63.)