Can Drysol (aluminum‑chloride hexahydrate) be applied to the hands and feet to treat hyperhidrosis?

Can Drysol Be Applied to Hands and Feet for Hyperhidrosis?

Yes, Drysol (aluminum chloride hexahydrate) can be applied to both hands and feet to treat hyperhidrosis, though it is more effective for axillary (underarm) sweating and requires careful application technique to minimize irritation.

Evidence for Use on Hands and Feet

The FDA label for Drysol indicates it is "for topical application only" without restricting specific body sites 1. Research directly supports its use on palms and soles:

• Palmar hyperhidrosis: A 20% aluminum chloride solution applied daily for 4 weeks significantly reduced palm sweating, with patients reporting improvement within 48 hours 2. However, the effect disappeared within 48 hours of stopping treatment, requiring ongoing use.

• Plantar hyperhidrosis: Both 12.5% and 30% aluminum chloride concentrations significantly reduced foot sweating over 6 weeks, with the lower concentration (12.5%) recommended for outpatient treatment due to similar efficacy with better tolerability 3.

• Lower efficacy than axillary use: Palmar and plantar hyperhidrosis respond less effectively to aluminum chloride compared to underarm sweating 4, often requiring higher concentrations (20-30%) and prolonged application times.

Application Instructions

For hands and feet, apply the following protocol:

1. Timing: Apply only at bedtime to completely dry skin (sweating reduces effectiveness)
2. Preparation: Ensure hands/feet are thoroughly dry; consider using a hair dryer on cool setting
3. Application: Apply thin layer to affected areas
4. Occlusion: Cover with plastic wrap or wear cotton gloves/socks overnight to enhance penetration 5
5. Morning routine: Wash off in the morning
6. Frequency: Start with nightly application; once sweating is controlled (typically 1-2 weeks), reduce to 2-3 times weekly for maintenance 6, 7

Critical Warnings and Side Effects

Irritation is the primary limiting factor 1:

• Approximately 25-33% of patients develop skin irritation 2
• Most irritation resolves within 1 week and patients can continue treatment
• Severe irritation may require discontinuation
• Avoid application to broken, irritated, or recently shaved skin
• Miliaria (heat rash) can occur with exertion after treatment 5

Treatment Algorithm

Step 1: Start with 12.5-20% aluminum chloride hexahydrate nightly for 2 weeks

• If adequate response: reduce to maintenance (2-3x/week)
• If inadequate response: proceed to Step 2

Step 2: Increase concentration to 30% or add occlusion with plastic wrap

• If adequate response: reduce to maintenance
• If inadequate response: proceed to Step 3

Step 3: Consider iontophoresis with 1% aluminum chloride (30-minute sessions for 4 consecutive days) - this produces more persistent effects with fewer side effects 8

Step 4: Add oral glycopyrrolate 1-2 mg twice daily if topical therapy alone is insufficient 7

Practical Considerations

• Response time: Expect improvement within 48 hours to 1 week 2, 6
• Persistence: Effects last only 1-2 weeks after stopping treatment, requiring ongoing maintenance 2, 6
• Overall success rate: Only 15-56% of patients achieve adequate control with topical aluminum chloride alone for palmar/plantar hyperhidrosis 7
• Storage: Keep at 59-86°F (15-30°C) and protect from freezing 1

The evidence demonstrates that while Drysol can be used on hands and feet, it requires patient commitment to proper application technique and realistic expectations about efficacy, which is lower than for axillary hyperhidrosis.