BOTOX^® Cosmetic (onabotulinumtoxinA) dosage depends on which of the 3 FDA-approved areas you’re treating—moderate to severe forehead lines, lateral canthal lines, and/or glabellar lines. Each area is approved for 20-24 units each area. The cost typically for one area is $260.00. Although dosing is very patients dependent and can vary both more and less for each person. . The average botox patient receives 32 units which cost $ 415.00. Schedule Botox Treatment now!