The present prospective study was designed to conduct a local survey on patients under anti-tuberculosis therapy hospitalized in Abo-Seta hospital, Tripoli, Libya from the safety point of view. The study was carried out on 75 inpatients. The effects of the used drugs on some hematological parameters and liver function biomarkers were monitored for six-month period of treatment. Our survey showed that tuberculosis affects people with low and medium levels of education and withno job. The frequency of adverse effects related to treatment with Abo-Seta hospital regimen were decreases in WBCs count (-38.7%), RBCs count (-32.1%), platelets count (-33%) and hemoglobin concentration (-35.5%). However, in most of the cases, it was not necessary to modify the treatment regimen because of such side effects. Some parameters showed spontaneous recovery as RBCs count (+22.1%) and hemoglobin level (+20.1%). Combined therapy of ethambutol, isoniazid, pyrazinamide, and rifampicin has been used in Abo-Seta hospital, as a regimen for tuberculosis infection, may be associated with a high risk of hepatic toxicity during first month of treatment. However, during the remaining five months there was a good recovery of liver enzymes profile. Upon the data obtained from the present study, it could be concluded that TB patient after 6 month of treatment didn't develop multi-drug resistant tuberculosis (MDR-TB)