• Anti sickling
• Diuretic

• Metabolism: Unchanged 1,2-diphenylhydrazine was detected following treatment by all routes, and aniline and benzidine were identified following oral and intraperitoneal treatments. Other metabolites included two unspecified hydroxy derivatives of benzidine (oral route), 2- and 4- aminophenol (intraperitoneal route), and unidentified compounds (oral, intravenous, and intratracheal routes). Aniline is oxidized by hydroxylation of a ring carbon to form 2-or 4-aminophenol or of the nitrogen to form phenylhydroxylamine, and then is conjugated to glucuronic or sulfuric acid. Benzidine is formed readily from 1,2-diphenylhydrazine by acid rearrangement. It has been suggested that benzidine may be produced from 1,2-diphenylhydrazine by acidity in the stomach. (L463)
• Uses/Sources: 1,2-Diphenylhydrazine is used to make fabric dyes in other countries, and to make certain medicines. Exposure may result from breathing in dust coated with 1,2-diphenylhydrazine and eating dirt or smearing contaminated dirt on the skin. (L463)
• Health Effects: Nonneoplastic liver lesions, hepatocellular carcinomas and/or neoplastic liver nodules; seizures and coma. (L463)
• Symptoms: Irritatinon to the eyes, nose and respiratory system, depending on the route of exposure. Cough, redness of the exposed surface. (L463)
• Treatment: Consider gastric lavage after ingestion of a potentially life-threatening amount of poison if it can be performed soon after ingestion. Following inhalation, move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with inhaled beta2 agonist and oral or parenteral corticosteroids. Irrigate exposed eyes with copious amounts of room temperature water for at least 15 minutes. If the exposure occurs through dermal contact remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician may need to examine the area if irritation or pain persists. (T36)

• Carcinogenicity: Not listed by IARC. Benzidine, a metabolite of 1,2-diphenylhydrazine, is carcinogenic to humans (Group 1). Aniline, another metabolite, is not classifiable as to its carcinogenicity to humans (Group 3). (L135)
• Toxicity: LD50: 959 mg/kg (Oral, Rat) (L463)

Two of the known metabolites, aniline and benzidine, may contribute to the toxicity and/or carcinogenicity of 1,2-diphenylhydrazine. Nonneoplastic liver lesions, hepatocellular carcinomas and/or neoplastic liver nodules indicate that the liver is a target of 1,2-diphenylhydrazine toxicity. As aniline and other aromatic amino metabolites of 1,2-diphenylhydrazine (e.g., aminophenols) are methemoglobinforming compounds by either oral or inhalation routes of exposure, it is possible that 1,2-diphenylhydrazine may cause methemoglobinemia in humans. (L463)