antidepressants

This is probabaly a stupid question, but would it be a bad idea to take double the dose of that ny antidepressant is? Like 2 pills a night instead of 1? It's only 15mg and I really don't feel like it's having a huge affect on how I'm feeling. I feel like maybe if I took 2 instead of 1 it could maybe have a better chance of me feeling better.