Monalazone, used as monalazone disodium (INNTooltip International Nonproprietary Name; the disodium salt) and sold under the brand names Naclobenz-Natrium, Spergisin, and Speton, is a vaginal disinfectant or antiseptic and spermicidal contraceptive.

[1][2][3][4] It is a sulfonylbenzoic acid derivative and is closely related structurally to halazone.

[1] A vaginal tablet combination of 0.125 mg estradiol benzoate and 10 mg monalazone was previously marketed under the brand name Malun 25.

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