Question: I’m considering BOTOX or Dysport for crows feet. How long does it last? Dr. Prasad:  Typically the effects after Botox or Dysport treatments lasts 3 to 6 months. At my New York practice, many patients come in every 4 months for their Botox injections (before the Botox / Dysport completely wears off). This has been a successful approach for …