Hi, doctor . YA, I have been taking Levothyroxine for months now and today at school heard teacher telling the negative effects of steroids. I d laugh about it, but inside I thought (i gotta check when I get home). I ask ma and she only remembers that its a sythroid. I remembered what the teacher saying It will tell your body you re grown up . I m a boy htat isnt growing greatly there and I i feel terrible that I have been taking it. My thyroid symtoms that I was taking this medicene for are back (fatigue, hard to think, headaches, etc; with somemore like irratability, more aggressive!, and pains). I have to know. Does Levothyroxine effect my penis growth? Since steroids tell my body I ve done growing. Do I really have to take this worthless pill for the rest of my life? Well my hypothyroid aches and pains are back, along with me getting aggressive. My hard to think agressive, stomach pains got me loss of control and got me suspended for yelling the F word. Does it really cause weight lose? Cause: I sure don t see it. Really feeling bad right now...