異菸肼为白色轻鬆結晶粉末,味微苦,每克能溶解於8.35毫升25℃的水或29.5毫升的甘油中,94%酒精100毫升溶解1.7克,99%酒精100毫升溶解0.85克,100毫升乙醚溶解0.005克,100毫升氯仿溶解0.18克,100毫升丙二醇溶解4克。2%水溶液pH為6.8～7,熔點169～171℃,分子量125.055,化學構造式如次: Isoniazid is a white, light crystalline powder with a slightly bitter taste, dissolved in 8.35 ml of water at 25 ° C or glycerol of 29.5 ml per gram, 1.7 g dissolved in 100 ml of 94% ethanol and 0.85 g dissolved in 100 ml of 99% 0.005 ml of ether was dissolved in ml, 0.18 g of 100 ml of chloroform and 4 g of 100 ml of propylene glycol were dissolved. 2% aqueous solution of pH 6.8 to 7, the melting point of 169 to 171 ° C, a molecular weight of 125.055, the chemical formula such as times: