Lexapro helped me tremendously. It is really great with motivational issues and mood swings. Give it a month before you judge it, unless you are experiencing adverse side-effects.
You might experience a strange taste in your mouth, but it can go away with time. Also, you might have some insomnia for a while.
Don't stop taking it cold-turkey, if you change your mind on it. Decrease by half-dose for a few weeks. The withdrawals can be miserable.
Also, if you are nursing, you might see your baby become insomnic and irritable. That was the only really adverse thing that happened with me on Lexapro. I had to stop taking it immediately, because my baby girl, who normally slept 5-7 hrs straight at night, was not sleeping any more than 45 minutes at a time at all during the day or night.