Considering the fact that dextromethorphan is surely an optical isomer on the Plan II opiate levomethorphan (but won't act like an opiate), an exemption was important to retain it an uncontrolled material. The Federal Analog Act does not implement to dextromethorphan due to the fact a whole new drug application https://chemicalglobe.com/product-tag/buy-pure-dxm-dextromethorphan-powder-online/