Isoniazid is currently not available as a spray, only as a tablet and injection. 1. Isoniazid tablets: this drug is mainly used in combination with other anti-tuberculosis drugs for anti-tuberculosis treatment. Adverse reactions such as peripheral neuritis, loss of appetite, nausea and vomiting may occur after use, and it is contraindicated in patients with abnormal liver function, psychosis and epilepsy. 2. Isoniazid injection: the drug is also used in combination with other anti-tuberculosis drugs for the treatment of various types of tuberculosis and some non-tuberculosis mycobacterial diseases, the drug has hepatotoxicity, neurotoxicity and other adverse reactions, allergic to the components of the product and other patients are prohibited. If the patient’s body appears uncomfortable symptoms, it is recommended to go to the hospital in a timely manner, strictly under the guidance of the physician to use the drug, if you need to use with other drugs at the same time, it is possible to consult a physician in advance.