There are a few reasons why the treatment of tuberculosis (TB) can fail. One of them is the lack of adherence to the DOTS strategy (directly observed treatment, short-course, recommended by the World Health Organization). The absence of fast recovery and adverse effects are commonly associated to treatment drop-out. As a result, Multi-Drug Resistant TB is emerging. Pyrazinamide (PZA), the only drug effective against latent TB, produces serious hepatic side effects.