POTENTIAL FOR AN EXTERNAL VAGINAL ANTIITCH CREAM CONTAINING BENZOCAINE TO CAUSE METHEMOGLOBINEMIA IN HEALTHY WOMEN

OBJECTIVES: Our purpose was to assess the potential for an external Va ginal antiitch cream (20% benzocaine, 3% resorcinol) to significantly increase levels of methemoglobin above normal in healthy women. STUDY DESIGN: Fifty-five women reporting external vaginal itch were recruite d for the study. Each patient was used as her own control with methemo globin levels being measured before and after use of the cream. Women were instructed to apply a I-inch strip of cream by fingertip to the e xternal genital area three or four times a day for 7 consecutive days. RESULTS: There were no significant differences in methemoglobin level s before and after use or in levels from a subgroup of women aged >50 years compared with levels in a younger population. CONCLUSIONS: This preparation appears to be safe when used as directed; however, the res ults cannot he extrapolated to the very young. Nevertheless, lavish or frequent application over wide areas of excoriation might lead to tox ic concentrations and methemoglobinemia. Therefore patients with serio us vaginal disease should be advised against self-treatment beyond the 7-day limit imposed by the Food and Drug Administration for over-the- counter external analgesic medications.