Yes, ChloraPrep is alcohol-based. It contains 70% isopropyl alcohol (rubbing alcohol) along with 2% chlorhexidine gluconate, an antiseptic that kills bacteria on the skin. The alcohol provides fast-acting germ-killing power, while the chlorhexidine continues working after the alcohol evaporates, offering longer-lasting protection against infection.
What ChloraPrep Is Used For
ChloraPrep is a skin antiseptic applied before surgeries, injections, and catheter insertions. Its job is to sterilize the skin at the procedure site, reducing the risk of surgical site infections. It comes in single-use applicators of various sizes, and a healthcare provider swabs it onto your skin in the minutes before a procedure.
The CDC rates the evidence for using alcohol-containing skin prep before surgery as “high quality” and recommends combining alcohol with an additional antiseptic like chlorhexidine. Alcohol alone kills bacteria quickly but stops working once it dries. Pairing it with chlorhexidine gives both an immediate and a lasting antimicrobial effect. CDC guidelines also note that chlorhexidine-alcohol is the preferred choice for patients who carry staph bacteria on their skin.
Why the Alcohol Content Matters
The 70% alcohol concentration is what makes ChloraPrep highly effective, but it also introduces a real fire risk in the operating room. Surgical tools like cautery devices and lasers can ignite alcohol vapor if the solution hasn’t fully dried. The FDA label requires a minimum of three minutes of air drying on hairless skin before draping or using any ignition source. On hairy areas, drying takes significantly longer and may not happen completely, which is why providers are instructed to avoid letting the solution pool in hair.
This fire risk is also why ChloraPrep can’t be used for every procedure. Alcohol-based skin preps are contraindicated for surgeries where the solution could pool or remain wet, and for procedures involving mucous membranes, the cornea, or the ear canal.
How It Compares to Non-Alcohol Alternatives
The main alternative for preoperative skin prep is povidone-iodine (the brownish-orange antiseptic you may have seen). A large randomized trial published in JAMA compared chlorhexidine-alcohol to povidone-iodine in over 3,300 surgical patients. Surgical site infection rates were nearly identical: 5.5% for chlorhexidine-alcohol and 5.1% for povidone-iodine, a difference so small it wasn’t statistically meaningful.
Despite these similar numbers, CDC guidelines still slightly favor chlorhexidine-alcohol overall, particularly because chlorhexidine keeps working on the skin for hours after application. Povidone-iodine is the go-to option when alcohol-based products can’t be used safely.
Who Should Not Be Exposed to ChloraPrep
The FDA label lists several contraindications. ChloraPrep should not be used on anyone with a known allergy to chlorhexidine, for lumbar punctures or any procedure where it could contact the membranes surrounding the brain and spinal cord, or on open wounds. The larger 26-ml applicator is specifically restricted from head and neck surgeries and from application areas smaller than about 8 by 8 inches.
Premature and very young infants are a particular concern. The FDA labeling now warns to use chlorhexidine products with care in premature infants or babies under two months old, citing a risk of irritation or chemical burns. Several cases of skin burns have been reported in preterm infants between 24 and 26 weeks gestation after exposure to alcohol-based chlorhexidine preparations. Their skin is thinner and more permeable, which increases both the risk of chemical burns and the amount of antiseptic absorbed into the body. For this reason, many hospitals avoid using ChloraPrep on very premature newborns in the first 48 hours of life.
What to Expect if ChloraPrep Is Used on You
If you’re having a surgical procedure, a nurse or technician will likely apply ChloraPrep to your skin using a sponge-tipped applicator. The solution goes on wet and feels cool due to the alcohol evaporating. It has an orange tint so the care team can see exactly which area has been prepped. You’ll notice the area drying over a few minutes before the team proceeds. The orange color may linger on your skin for a day or two after the procedure, which is normal and fades on its own.
Some people experience mild skin irritation or redness at the application site. True allergic reactions to chlorhexidine are uncommon but can be serious. If you’ve ever had a reaction to a skin antiseptic during a previous medical procedure, let your surgical team know before prep begins.