Recombinant human interferon alpha 1b for injection is given subcutaneously or intramuscularly, but the dosage used varies depending on the disease being treated. It can treat chronic hepatitis B, chronic granulocytic leukemia, chronic hepatitis C and other diseases. 1.Treatment of chronic hepatitis B: 1 time every other day, 30~550μg/dose, the course of treatment is 4~6 months, according to the condition, it can be extended to 12 months. 2. Treatment of chronic granulocytic leukemia: 30~50μg/dose once a day for at least 6 months, after remission, it can be changed to every other day injection. 3. Treatment of chronic hepatitis C: 1 time every other day, 30~50μg/dose, can be treated for 4~6 months, discontinue if not effective, and continue to be treated until 12~18 months if effective. The drug has the effect of regulating immunity, anti-virus and anti-tumor. Adverse reactions such as nausea, fever, alopecia, fatigue, headache, myalgia, loss of appetite, arthralgia, leukopenia or thrombocytopenia may occur after the use of the drug, and when the symptoms are severe, the drug should be reduced or discontinued and appropriate treatment should be given. Sedatives and sleeping pills should be used with caution when using this drug. It is contraindicated in the following conditions: history of myocardial infarction, angina pectoris or other serious cardiovascular disease; epilepsy and other central nervous system dysfunction; other serious illnesses that do not tolerate the side effects of the drug; allergy to the drug. Use with caution in allergic individuals. If you need to use the drug patients, please under the guidance of the doctor strictly follow the instructions of the doctor to take medication, do not self-medication.