Humira is a drug that can be used to treat a number or conditions. This includes Crohn's disease, rheumatoid arthritis, chronic plaque psoriasis, juvenile idiopathic arthritis, and Ankylosing Spondylitits. Both adults and children can be prescribed Humira. Humia ends up lowering the immune system ability to fight off infection, so care needs to be taken when children are involved. In some cases, and only when absolutely necessary, Humira can be taken by women who are pregnant. Taking Humira while breastfeeding is an issue that needs to be taken up with a doctor. This is something that is determined case by case.