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Piroctone Olamine

Also known as: Octopirox, Piroctone ethanolamine, 1-Hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2-pyridone monoethanolamine salt

An antifungal cosmetic ingredient used mainly in anti-dandruff scalp formulas outside the U.S. OTC drug monograph system.

Amber laboratory bottle, dark comb, and white flakes on charcoal slate
Editorial illustration

Piroctone olamine is a salt of piroctone used to control fungi and support preservation, especially in dandruff shampoos. Small comparative trials report dandruff improvement, but results are formula-specific. In the United States it is not one of the active ingredients listed in the FDA OTC dandruff monograph, so U.S. disease-treatment claims require separate regulatory support.2, 3

  • Targets fungal growth associated with dandruff1, 3
  • Evidence is mostly from finished shampoos1, 3
  • Regulatory status differs by market1, 3
  • Not interchangeable with zinc pyrithione or ketoconazole1, 3

What is Piroctone Olamine?

Piroctone olamine appears in scalp-care and cosmetic preservation systems. The useful evidence asks whether a defined shampoo improves flaking, not whether purified powder has a generic hair benefit.1, 3

Where it comes from

Natural sources

  • No meaningful natural source is used in cosmetic products

How it's made

Piroctone is manufactured and combined with ethanolamine to improve handling and solubility.

What it does in products

  • Antifungal support
  • Anti-dandruff formulation
  • Preservative support
  • Scalp-care active

Benefits

Reduced dandruff flaking

limited evidence

A controlled shampoo study found improvement with a piroctone-olamine formula.2

The trial was small and compared finished formulas, so the result does not establish equivalence across products.

Improved hair retention from treating dandruff

insufficient evidence

Any hair effect is indirect and has not been established as a stand-alone hair-loss treatment.2

Dandruff control and androgenetic hair-loss treatment are different outcomes.

Evidence scope and limitations

Topical scalp and cosmetic uses are covered; systemic antifungal treatment is not.

  • Clinical studies are small and formula-specific.
  • Regulatory status varies across markets.

Evidence last checked: 2026-09-28

Side effects & safety

Scalp irritation or dryness (uncommon)Stop if burning, rash, or persistent worsening occurs.

Safety considerations

  • Ask a clinician about medicated scalp products during pregnancy when treating a persistent condition.
  • Not for: Known allergy
  • Not for: Using on a severely inflamed or infected scalp without assessment
2

Amounts studied & product use

These figures describe research or common product use, not a personal dose or treatment recommendation.

In skincare studies and products

Finished rinse-off scalp products use low percentages set by regional cosmetic rules and supplier safety data; follow the labeled contact time.

2

Regulatory status

  • Not listed as an active ingredient in the U.S. OTC dandruff drug monograph; cosmetic and drug claims are regulated differently.
  • INCI name on cosmetic labels: Piroctone Olamine.
3

The shampoo is the tested intervention

Vehicle, contact time, cleansing strength, and co-actives all affect dandruff outcomes. Evidence for one piroctone formula should not be transferred to every serum or shampoo with the name on its label.

2, 3

Frequently asked questions

Is piroctone olamine an antifungal?

It has antifungal activity and is used in scalp products, but product claims depend on local regulation.2, 3

Does it regrow hair?

It is not an established treatment for patterned hair loss; dandruff improvement should not be presented as regrowth.2, 3

The bottom line

Piroctone olamine has plausible and limited formula-level dandruff evidence, but it should not be marketed as a universal antifungal or hair-growth treatment.

References

  1. Piroctone olamine: compound summary. PubChem, National Library of Medicine (2026) · ingredient monograph · CID 50258
  2. Efficacy of a piroctone olamine/climbazol shampoo in comparison with a zinc pyrithione shampoo in subjects with moderate to severe dandruff. International Journal of Cosmetic Science (2011) · randomized trial · PMID 21272039
  3. OTC Monograph M032: Drug Products for the Control of Dandruff, Seborrheic Dermatitis, and Psoriasis. U.S. Food and Drug Administration (2024) · government guidance

Revision history

  1. Initial publication with claim-level citations, formulation limits, safety context, and editorial evidence review.