Herklin

Piperonyl butoxide and Pyrethrum extract · PIPERONYL BUTOXIDE 40 mg/mL; PYRETHRUM EXTRACT .033 mg/mL · Shampoo · Topical · MarcusUSA

NDC 75940-0171-04 · 1 BOTTLE in 1 CARTON / 236 mL in 1 BOTTLE · OTC MONOGRAPH FINAL · View full market →

The short version

Just 2 companies supply this market — thin enough that a single exit would be felt immediately.

The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.

Medicare Part D does not cover over-the-counter drugs — by law it pays only for products requiring a prescription.

No NADAC pricing on file for this NDC — NADAC covers drugs dispensed by retail community pharmacies.

Not scored — fragility is computed for NADAC-priced NDCs.

0.1%chance of a new FDA shortage posting for piperonyl butoxide, pyrethrum extract (other) in the next 90 days

sole-source market

For scale: the typical drug’s chance is about 0.1% — this one is in ordinary territory.

Backtested statistical model over the whole market, not this package alone. Model details →

No FDA shortage reports for this drug or its presentations.

No enforcement reports list this package NDC.

Labeler	Strength	First seen	Last seen
MarcusUSA	PIPERONYL BUTOXIDE 40 mg/mL; PYRETHRUM EXTRACT .033 mg/mL	Jul 15, 2026	Sep 2, 2026
Oystershell Consumer Health Inc	PIPERONYL BUTOXIDE 40 mg/mL; PYRETHRUM EXTRACT .033 mg/mL	Jul 15, 2026	Sep 2, 2026

Roster from daily NDC Directory diffs — first/last seen dates start July 2026.

DrugDashboards, "Herklin — NDC 75940-0171-04," retrieved September 3, 2026, https://drugdashboards.com/drug/75940017104.

Free to cite with attribution — see how the data is put together.