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Pump spray

Hongo Killer Antifungal Spray

4.4 out of 5 · 399 ratings

A 1.5 fl oz (44 mL) pump bottle of undecylenic acid 20% in an alcohol base. The panel lists athlete's foot and ringworm.

Active ingredient
Undecylenic Acid 20% w/v
Net contents
1.5 fl oz (44 mL)
Form
Pump spray, pump sprayer

$13.16$8.77 per fl oz

Take It Home on Amazon

1 bottle · 1.5 fl oz (44 mL) · price updated 7 October 2026

Good for

  • A small bottle for a gym bag or a carry-on
  • Spraying between the toes with no propellant and no powder
  • A pump, not an aerosol: no propellant in the bottle

Look elsewhere for

  • Jock itch: this panel does not list it
  • Broken or tender skin: buyers describe a strong sting from the alcohol base
  • Use near fire or flame: the label marks it flammable

The label

Drug Facts: Antifungal Spray

All Drug Facts panels

  • Twice dailyMorning and night, on clean, dry skin.

  • 4 weeksDaily for 4 weeks for athlete's foot and ringworm.

  • Not under 2 yearsNot for children under 2 years of age unless a doctor directs it.

  • FlammableKeep away from fire and flame.

  • Not for scalp or nailsThe panel says the product is not effective there.

  • External use onlyAvoid contact with the eyes.

Drug Facts

Active ingredientPurpose

Undecylenic Acid 20% w/vAntifungal

Uses

For the cure of most:

  • athlete’s foot (tinea pedis)
  • ringworm (tinea corporis) For the relief of:
  • itching
  • burning
  • scaling
  • cracking
  • soreness
  • irritation

Warnings

For external use only.

Flammable: Keep away from fire and flame.

Do not use

  • on children under 2 years of age, unless directed by a doctor

When using this product

  • avoid contact with the eyes

Stop use and consult a doctor if

  • irritation occurs
  • there is no improvement within 4 weeks

If pregnant or breast-feeding, consult a health professional before using this product.

Keep out of the reach of children. If swallowed, get medical help or contact a Poison Control Center right away.

Directions

  • clean the affected area and dry thoroughly.
  • apply a thin layer of Hongo Killer® Antifungal Spray over affected area twice daily (morning and night) or as directed by a doctor
  • supervise children in the use of this product
  • for athlete’s foot: Pay special attention to spaces between toes; wear well fitting, ventilated shoes, and change shoes and socks at least once daily
  • for athlete’s foot and ringworm: Use daily for 4 weeks. If condition persists longer, consult a doctor. This product is not effective on the scalp or nails.

Inactive ingredients aloe, fragrance, hypromelloses, isopropyl alcohol, tocopherol acetate (vitamin E), water

Label text as printed. Source: Drug Facts panel on the carton, read from the product photo; DailyMed (National Library of Medicine), label on file with the FDA. Read 7 October 2026.

Directions for every form

X or Y

Antifungal Spray or Ultra Spray Liquid

ComparedAntifungal SprayUltra Spray Liquid
Active ingredientUndecylenic acid 20%Miconazole nitrate 2%
FormPump sprayAerosol liquid
Net contents1.5 fl oz (44 mL)5.3 oz (150 g)
Labeled forAthlete's foot, RingwormAthlete's foot, Jock itch, Ringworm
Flammable warningYesYes
Price$13.16$8.87
Per ounce$8.77 per fl oz$1.67 per oz

Take the pump spray for a pocket-size bottle of undecylenic acid 20%. Take Ultra Spray Liquid for a 5.3 oz (150 g) can of miconazole nitrate 2% whose panel also lists jock itch.

Questions

About Antifungal Spray

What is the active ingredient in Hongo Killer Spray?

Undecylenic acid 20% w/v, as printed on the side of the carton. The 6 inactive ingredients are aloe, fragrance, hypromelloses, isopropyl alcohol, tocopherol acetate and water.

Does Hongo Killer Spray burn?

It can sting. Isopropyl alcohol is on the ingredient list, and a 2-star buyer review calls it too hot. The panel says to stop use and consult a doctor if irritation occurs.

In buyers' words

Buyers on Antifungal Spray

Buyers describe their own experience with the form, the smell and the feel. What each product treats is on its Drug Facts panel.

Use as directed, read the tiny print.

This product is not to be confused with the larger spray can. The liquid in this small pump spray bottle is different. This stuff smells very strong and tends to work rather well. 3 or 4 pumps per foot at most. ONLY apply this to your FEET and TOES. It will feel like being sterilized by fire on the more tender parts of your body. I think my bean bag pulled up somewhere behind my liver.

SoleGrave · May 30, 2026

Too hot

Burns way too much and hard too remove once it starts

Rhiljr · July 15, 2016

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