Botox injections relax wrinkle forming facial muscles and reduces the appearance of fine lines and wrinkles. According to Allergan, the manufacturer of Botox and Latisse eyelash lengthener, injections last up to 4 months. Botox has new competition in the US with the introduction of another wrinkle paralyzer called Dysport. The average price of Botox reported by the RealSelf community ranges from $400 to $500.