Drysol is a prescription-strength antiperspirant used to treat excessive sweating, a condition known as hyperhidrosis. Its active ingredient, aluminum chloride hexahydrate at a 20% concentration, is roughly three to four times stronger than what you’ll find in over-the-counter “clinical strength” antiperspirants. It’s considered the first-line treatment for hyperhidrosis regardless of where on the body the sweating occurs or how severe it is.
How Drysol Works
Regular antiperspirants contain aluminum-based compounds, but at much lower concentrations. Drysol’s 20% aluminum chloride hexahydrate works by physically plugging the openings of sweat gland ducts near the skin’s surface. Over time, this blockage causes the sweat-producing glands in the treated area to shrink and become less active. The result is a significant reduction in sweating that goes well beyond what a drugstore antiperspirant can achieve.
Lower-concentration versions are also available at 12% and 6.25% for people who need less intensity or experience too much irritation from the full-strength formula.
Conditions and Body Areas It Treats
Drysol is prescribed for primary focal hyperhidrosis, which is excessive sweating that isn’t caused by another medical condition or medication. The American Academy of Family Physicians recommends it as the starting treatment for all major problem areas:
- Underarms (axillary): the most common site, where sweating soaks through clothing
- Palms (palmar): sweaty hands that interfere with gripping objects, handshakes, or daily tasks
- Feet (plantar): excessive foot sweating that leads to slipping, odor, or skin breakdown
- Face and scalp (craniofacial): visible sweating on the forehead or hairline
For all of these locations, topical 20% aluminum chloride is the recommended first step before considering other options like prescription oral medications, injections, or procedures.
How to Apply It
Drysol is typically applied once a day at bedtime. Nighttime application matters because your sweat glands are least active while you sleep, which gives the aluminum chloride time to settle into the ducts without being washed away by perspiration. You apply it to completely dry skin in the affected area and wash it off in the morning.
Once sweating is under control, most people can reduce the frequency to once or twice a week for maintenance. The key during the initial phase is consistency: applying it nightly until you notice a meaningful drop in sweating, then tapering down.
Side Effects and Skin Irritation
The most common complaint with Drysol is skin irritation. Because the 20% concentration is strong, many users experience burning, stinging, or itching at the application site, especially during the first few uses. The underarm area tends to be the most sensitive.
A few practical steps reduce irritation significantly. Make sure your skin is completely dry before applying. If you’ve just showered and your skin is still slightly damp, the solution reacts with moisture and becomes more irritating. Never apply it to broken skin, irritated skin, or skin you’ve recently shaved. If you shave your underarms, wait at least 24 to 48 hours before using Drysol on that area. If the solution accidentally gets in your eyes, flush them with plenty of water immediately.
Who Should Avoid Drysol
You shouldn’t use Drysol if you have an allergy to aluminum chloride. People who are pregnant, trying to become pregnant, or breastfeeding should discuss it with their prescriber, as safety in these groups hasn’t been well established. Anyone with open cuts, rashes, or active skin conditions in the treatment area should wait until the skin heals before starting.
Drysol vs. Over-the-Counter Options
Standard antiperspirants contain aluminum compounds, but at concentrations well below Drysol’s 20%. Even “clinical strength” products sold over the counter top out much lower. If you’ve tried the strongest drugstore antiperspirant and still sweat through your shirts or have visibly wet palms, that gap in concentration is why Drysol exists. It requires a prescription precisely because the higher dose is more effective but also more likely to irritate skin.
For children and adolescents dealing with hyperhidrosis, Drysol is also used. Children’s Hospital of Philadelphia lists it as one of the most commonly prescribed topical treatments for young patients, applied the same way: once daily at night to the affected area. A lower-concentration formula (6.25%) may be tried first in younger or more sensitive skin.
What to Expect Over Time
Drysol is not a cure for hyperhidrosis. It manages the condition for as long as you use it. Most people find that after the initial nightly phase brings sweating under control, they can maintain results with just one or two applications per week. If you stop using it entirely, sweating gradually returns as the sweat gland ducts reopen and regain function. For many people, that trade-off is worthwhile: a few seconds of application a couple of nights a week in exchange for dry, comfortable skin during the day.