 Hence, materials like Polytetrafluoroethylene (Teflon) are not, and cannot be, considered as FDA Approved, rather, they are "FDA Compliant" or "FDA Acceptable".Medical countermeasures (MCMs) are products such as biologics and pharmaceutical drugs that can protect from or treat the effects of a chemical, biological, radiological, or nuclear (CBRN) attack.MCMs can also be used for prevention and diagnosis of symptoms associated with CBRN attacks or threats.