Hydrocortisone-17-Butyrate
A "labile ester" steroid that confuses people by name — it behaves nothing like plain hydrocortisone for allergy
INCIHydrocortisone Butyrate
- Category
- Corticosteroid
- Risk level
- medium
- The name is misleading
- It shares "hydrocortisone" with the OTC cream but the 17-butyrate ester changes its behaviour — for allergy it groups with the labile esters, NOT with plain hydrocortisone (Group A)
- How it's detected
- A "labile ester" (Group D2) steroid usually picked up through cross-reactivity with budesonide; added to panels as a confirmatory marker
- Potency
- More potent than plain hydrocortisone — a moderately potent (class II) topical steroid
- Brand
- Sold as Locoid
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This ingredient may appear under any of these names:
Commonly found in
Possible reactions
- Eczema that fails to improve — or worsens — with steroid treatment
- Contact dermatitis at the application site
- Incomplete or absent response to steroid therapy
- Skin thinning (atrophy) that can mask an underlying allergy
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What is hydrocortisone-17-butyrate?
Hydrocortisone-17-butyrate (INCI: Hydrocortisone Butyrate; brand Locoid) is a butyrate ester of hydrocortisone — and that ester is the whole story. Despite sharing the "hydrocortisone" name with the familiar OTC cream, the C-17 butyrate group changes both how strong it is and, crucially for this site, how it behaves in allergy.
For potency, it's more potent than plain hydrocortisone (a moderately potent, class II topical steroid). For allergy, it does not group with plain hydrocortisone (the "Group A" hydrocortisone-type cluster). Instead it behaves as a "labile ester" steroid (Group D2 in the Coopman scheme) and tends to cross-react with budesonide — which is why budesonide, as a broad screening marker, picks it up.
Why the classification matters
Corticosteroid allergy travels in cross-reacting chemical groups, not by brand name — and this molecule is the poster child for why that distinction matters:
- A person allergic to plain hydrocortisone (Group A) can often tolerate hydrocortisone-17-butyrate, and vice versa.
- Hydrocortisone-17-butyrate's relevant cross-reactions are with the labile-ester / budesonide group, not with the hydrocortisone group it sounds like it belongs to.
So on a patch-test panel it's used as a confirmatory marker for that labile-ester group, complementing budesonide.
"Hydrocortisone" and "hydrocortisone-17-butyrate" look like close cousins on a prescription, but for contact allergy they sit in different cross-reaction groups. Reacting to one says little about the other — which is exactly why steroid allergy is mapped by patch testing, not by reading the name on the tube.
Why it causes reactions
The mechanism mirrors other corticosteroid allergens: the molecule (or its metabolites) forms hapten-protein conjugates and drives a modified Type IV delayed hypersensitivity, while the steroid's anti-inflammatory action partly masks the reaction. The clinical signature is therefore the familiar one — incomplete response, "steroid dependence," or quiet worsening — sometimes complicated by skin atrophy from prolonged potent-steroid use. Risk is higher with long-term use of moderate/potent steroids, treatment-resistant eczema, and concurrent budesonide positivity.
Where it's found
- Locoid cream, ointment, lotion (and generic hydrocortisone butyrate) for eczema, dermatitis and scalp inflammation.
On labels: Hydrocortisone Butyrate, Hydrocortisone 17-Butyrate, or brand Locoid.
Safer alternatives
- Calcineurin inhibitors — tacrolimus, pimecrolimus: steroid-free, no corticosteroid cross-reaction.
- Crisaborole — non-steroidal for mild–moderate eczema.
- A confirmed-safe steroid group — possibly including Group A steroids if only the labile-ester group is positive — but only as guided by patch testing.
- Dupilumab — a biologic for severe, steroid-allergic eczema.
The bottom line
Hydrocortisone-17-butyrate is a moderately potent steroid whose name causes real confusion: it does not behave like plain hydrocortisone for allergy. It's a labile-ester steroid detected through budesonide cross-reactivity, so an allergy to one "hydrocortisone" tells you little about the other. If steroid-treated eczema won't clear, the answer is patch testing to map your cross-reaction groups — then choosing a tolerated steroid class or a steroid-free route.
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