My feeling is that if you're handling Rem side-effects, you'll be ok with Humira
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Yes, it's an injection. If you're uncomfortable with needles, you can get a nifty pen that will do the injection for you so you don't have to see the syringe or the needle. Some people who don't like needles get a spouse / parent / SO to do the injection for them; that might help you if you really can't cope with injecting yourself.
You can find out more info by clicking on the "medications" link in my signature.
All the best to you.
Ivy.