The drug is a water-soluble nucleotide analogue and is well absorbed orally.The product can enter the infected abdominal cavity, joint cavity and aqueous humor, and can pass through the blood-brain barrier.The drug is widely distributed in liver, kidney, heart, spleen and lung tissues, and its concentration is greater than or equal to the blood concentration of the same period.The drug concentration in inflammatory CSF can reach 50% to 100% of the plasma drug concentration in the same period.