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| Trade names | Erbazid, Neoiscotin, Neo-Iscotin, Nesticide, Neotizide, Neo-Tizide |
| Other names | Metaniazide; Neotizide; Isoniazid methanesulfonate; Isoniazid methanosulfonate; Isoniazid mesylate; Isonicotinic acid hydrazide methanesulfonate |
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| ECHA InfoCard | 100.033.264  |
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| Formula | C7H9N3O4S |
| Molar mass | 231.23 g·mol−1 |
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Methaniazide, brand name Neotizide among others, is an antibiotic which was used in the treatment of tuberculosis.[1][2][3] It is a derivative of methanesulfonic acid and isoniazid, which is also an antituberculosis drug but has comparatively been far more widely known and used.[1] Isoniazid is a prodrugofisonicotinic acid, and acetylisoniazid, a metabolite of isoniazid, is a metabolic intermediate through which most of the isonicotinic acid is formed.[4] Methaniazide features its mesylate group at the same position as that of the acetyl group in acetylisoniazid, and so methaniazide probably acts as a prodrug of isonicotinic acid similarly to isoniazid and acetylisoniazid. Methaniazide is used as the sodium salt.[1] It was never approved for use or sale in the United States.[5]
Neothetazone is an antibiotic combination of methaniazide (neotizide) and thioacetazone which was previously used in the treatment of tuberculosis.[6] It has been associated with a case report of gigantomastia.[6][7][8] Similarly, there have been a variety of case reports in the literature of gynecomastia associated with isoniazid treatment.[9]
Diffuse hypertrophy of the breasts seems to have been associated in this patient with treatment with Neothetazone, which consists of neotizide and thiacetazone, and which is very commonly used in the treatment of tuberculosis.
Drug-induced mammary hyperplasias have been reported as rare complications of D-penicillamine and Neothetazone. [...] It is rare for breast hypertrophy to be induced by drugs. In particular, gigantomastia has been reported to be induced by only two drugs: D-penicillamine and the antibiotic neothetazone. [...] In 1970, drug-induced gigantomastia was reported for the first time by Scott.4 It was induced by the antibiotic Neothetazone.
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