My 19 year old daughter is currently taking Methotrexate to treat severe Psoriasis. She is often ill, particularly with sore throats which is stopping her attending college. My husband takes Humira and has no side effects. My daughter is thinking of switching to Humira but given her young age is worried she will only be able to take it for say 10 years and then stop. So how long can someone be on Humira?