Tetracaine
An ester anaesthetic in eye drops and pre-procedure numbing creams — cross-reacts with benzocaine and the PPD/para-amino family
INCITetracaine
- Category
- Anesthetic
- Risk level
- medium
- What it is
- A potent ester-class anaesthetic (a PABA derivative), aka amethocaine
- A "para" compound
- Cross-reacts with benzocaine, procaine, PABA, PPD (hair dye), and sometimes sulfonamides
- Class to switch to
- Amide anaesthetics (lidocaine, prilocaine) do not cross-react and are the safe alternative
- Where it appears
- Eye drops for procedures, and topical numbing creams before injectables/lasers
Look for these names on ingredient lists
This ingredient may appear under any of these names:
Commonly found in
Possible reactions
- Allergic contact dermatitis at the application site
- Ocular/periocular reactions from eye drops
- Cross-reactive reactions with benzocaine and PPD
- Systemic hypersensitivity in highly sensitised people (rare)
Top picks without Tetracaine
Highly rated products whose ingredient lists don't include Tetracaine.
As an Amazon Associate, AllerNote earns from qualifying purchases.
Always scan the actual label before use — formulations change.
What is tetracaine?
Tetracaine (also amethocaine; brand Pontocaine) is a potent ester-class local anaesthetic in the para-aminobenzoate family — the same structural group as benzocaine, procaine, and PABA. It's used in ophthalmic anaesthetic drops (for eye procedures like tonometry or foreign-body removal), in topical numbing creams before injections and minor procedures, and — increasingly — in pre-procedure numbing creams before aesthetic treatments (injectables, lasers).
Why it causes reactions
Tetracaine's allergenicity comes from its para-amino structure, which drives broad cross-reactivity across that family:
- Benzocaine, procaine (other ester anaesthetics) — common cross-reactors
- PABA (older sunscreens)
- PPD — the main permanent-hair-dye allergen; a clinically important link (PPD allergy may signal ester-anaesthetic risk, and vice versa)
- Sulfonamide drugs — less consistent
Reactions are delayed (Type IV) at the contact site; the ophthalmic route matters because the conjunctiva absorbs well, so repeated use can sensitise.
The key practical takeaway is the ester-vs-amide split: if you react to tetracaine (or benzocaine), amide anaesthetics — lidocaine, prilocaine — generally do not cross-react and are the safe substitutes (EMLA cream is lidocaine + prilocaine).
How to spot and avoid it
- On drug labels look for Tetracaine / Amethocaine.
- Ask what''s in the numbing cream before injectables or lasers if you're ester-allergic.
- Request an amide anaesthetic (lidocaine/prilocaine) instead.
- Flag the PPD link to your dermatologist if you have hair-dye allergy.
Safer alternatives
- Lidocaine / prilocaine (amide class) — including EMLA cream — for pre-procedure numbing.
- Cooling sprays/refrigerants for very brief minor-procedure anaesthesia.
- Skip PABA sunscreens (largely discontinued anyway) if you're para-amino-allergic.
The bottom line
Tetracaine is a potent ester anaesthetic whose allergy travels with the whole para-amino family — benzocaine and, notably, PPD hair dye. If you're sensitised, the fix is straightforward: use an amide anaesthetic (lidocaine), and make sure anyone numbing your skin or eyes knows.
Was this article helpful?
One tap tells us what to write more of. No account needed.
Is this ingredient in your products?
Scan any cosmetic product to check for Tetracaine and 30+ other allergens instantly.