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 in patients who have a history of, or are suspected to have methaemoglobinaemia. The risk of methaemoglobinaemia is increased in patients who have a reduced haematological capacity for oxygen transport including those with glucose-6-phosphate dehydrogenase (G6PD) deficiency, haemaglobinopathies, or anaemia.
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.