FDA-approved cosmetic indications Both Botox and Dysport are approved for treating moderate to severe glabellar lines (frown lines). Off-label uses Off-label, both are used to treat forehead lines, crow’s feet, and lower face and neck lines. Cost Botox costs between $10-$20 per unit, while Dysport is genenelly priced in the same range. Onset of action & Longevity Botox starts showing results in 3-5 days and lasts 3-4 months. Dysport has a quicker onset, often within 1-2 days, but also lasts 3-4 months. Units used For glabella, forehead, and crow’s feet, Botox typically requires 20, 20, and 12 units per side respectively, while Dysport generally requires 2.5 times the Botox dose due to a different dilution ratio.