Antiseptics used on skin are regulated by which agency, and what is a typical usable agent range?

• A. Disinfectants used on surfaces; regulated by EPA
• B. Germicides formulated for use on skin and are regulated by the FDA; can use alcohol or benzalkonium; alcohol should be 60-95%
• C. Antiseptics are vaccines to prevent infection
• D. Synthetic fragrances used to mask odors

Answer: (D)

Antiseptics applied to skin are regulated by the FDA, not the EPA. They are germicides formulated for topical use, and their alcohol-based active ingredients are commonly effective within a 60–95% concentration range. Alcohol works best when there’s some water present to help denature proteins and disrupt membranes; too little alcohol reduces antimicrobial activity, and near-pure alcohol is less effective because water is needed for optimal action. Benzalkonium chloride is another possible skin antiseptic ingredient, but the key point is that FDA regulates these products, while EPA handles surface disinfectants. The idea that antiseptics are vaccines or fragrances doesn't apply here.