My advice: I would personally refrain from learning two similar languages at the same time if you can. For example, I could see someone successfully learning Spanish and Mandarin at the same time. On the contrary, learning Italian and Spanish at the same time seems like a headache!

Just do it. Any language major will generally have 2 languages. If you want to speak two. Bite the bullet and just do it. Admiration. :) . Maybe you will see similarities, if you'll talking about two that have the same Germanic/Latin roots?

Antidepressants?

Don't!