Hypersensitivity to benzocaine or to any of the excipients listed in section 6.1 or paraaminobenzoic acid (PABA), parabens or paraphenylenediamine or to commercial hair dyes as there is cross-sensitivity between these products.
A history of allergy to local anaesthetics such as procaine, butacaine or any other 'caine' anaesthetics.
In patients who have a history of or are suspected to have methaemoglobinaemia (see section 4.8).
Do not use with sulphonamides (see section 4.5).
Do not use with cholinesterase inhibitors (see section 4.5).
Do not apply to large areas of skin, eczematous, sunburnt, infected or broken skin.