One main thing is that inh can lead to liver problems and you should be monitored regularly with lab tests.
Inh can also cause a rash
. Many on inh will complain about some GI distress like nausea
. In rare cases, inh can cause depression
. It is important to stay on the inh long enough to completely get rid of the tb, and that is generally for one year. Talk with your dr. Good luck.