SPL Set ID: 77795c31-1cdf-4a20-b4a1-cd15f5b310f1

Isoniazid is the hydrazide of isonicotinic acid. Isoniazid Injection USP provides 100 mg isoniazid per mL with 0.25% chlorobutanol (chloral derivative) as a preservative; the pH has been adjusted to 6 to 7 with sodium hydroxide or hydrochloric acid. At the time of manufacture, the air in the container is replaced by nitrogen. Isoniazid is chemically known as isonicotinyl hydrazine or isonicotinic acid hydrazide. It has an empirical formula of C 6 H 7 N 3 O and a molecular weight of 137.14. It has the following structure: Isoniazid is odorless, and occurs as a colorless or white crystalline powder or as white crystals. It is freely soluble in water, sparingly soluble in alcohol, and slightly soluble in chloroform and in ether. Isoniazid is slowly affected by exposure to air and light. isoniazid-chemical-structure