BOTOX Cosmetic is a biologic product that cannot be interchanged – or substituted – for another product. In fact, the FDA has stated BOTOX Cosmetic is “non-interchangeable,” which means that its safety and effectiveness cannot be claimed by any other product. The potency – or strength – of BOTOX Cosmetic is measured in scientifically defined units, and the FDA has concluded that a unit of BOTOX Cosmetic does not equal a unit of any other product. People who are prescribed a biologic product have a right to know exactly what they are receiving. Be sure to ask which product you are being prescribed and why.