One of the most frequently asked question before someone decides to get Botox is how often he or she will have to repeat the injection for the results to be permanent. While some patients wait for the Botox to wear off completely, others visit the clinic at the first sign of wrinkles re-appearing. How often a person chooses to repeat the procedure is a personal choice based on their own preferences.
Usually, Botox lasts 3 to 6 months, depending on a number of factors. In some cases (e.g. if the substance is used to treat migraines) the frequency could increase and the patient could get the injection every other month.
There is a concern that has been raised among patients. Because of some internet articles and unverified information, some people seem to be of the belief that repeating the procedure will eventually make them immune to the substance, but cases are so rare that there is no sufficient data to properly study the phenomenon. Other than that, it would take a huge dosage of Botox, one that no doctor could possibly administer, for the patient to stop reacting.
In fact, if Botox is administered for cosmetic purpose, the effect will last longer as time passes. This means the same dosage of substance will be used, but the frequency will decrease.