Humira, a biologic drug used to treat certain forms of arthritis and other chronic conditions, is not for everyone. People with an active infection, those who are pregnant or nursing, those with moderate to severe liver impairment or people who are taking medications that interact negatively with Humira should avoid the medication. In addition, Humira can cause serious side effects such as heart failure and tuberculosis so individuals with a history of these conditions should also consult their doctor before using it. Finally, since Humira is only approved for adults 18 years of age and older, it should never be given to children without consulting your physician first.