Common anti-tuberculosis drugs include isoniazid, rifampicin and pyrazinamide. Taking the above drugs as an example, according to the pharmacokinetic absorption time in 1~4.5 hours, but there is a certain individual variability. 1. Isoniazid: Isoniazid can reach the peak blood concentration in 1~2 hours after oral administration, but the time of blood concentration decrease after 4~6 hours will be different according to the metabolism of patients with different speed of acetylation. 2. Rifampicin: Rifampicin can reach peak blood concentration 1.5 hours to 4 hours after taking the drug. If patients take rifampicin after eating, the absorption concentration of the drug can be reduced by about 30%, and the half-life of rifampicin is 3~5 hours. 3. Pyrazinamide: Pyrazinamide can be widely distributed in human tissues and body fluids after oral administration and absorption through the gastrointestinal tract. After 2 hours of oral administration, the blood concentration of pyrazinamide can reach the peak, if the patient’s liver and kidney function is reduced, the time of drug metabolism will also be extended. There is also some individual variability in how long it takes for tuberculosis drugs to be absorbed. If in doubt, consult a professional if necessary.