One thing to keep in mind with side effects: they are most likely to happen during the first week or two that you're on the medication. As your body adjusts, the side effects should lessen or go away completely. If they don't, it would be a sign that we should probably change the medication. And not everyone experiences them. Plenty of people take medications without any side effects at all.

For the one I'm leaning towards, the most common side effects are: nervousness, anxiety, difficulty falling asleep or staying asleep, nausea, diarrhea, dry mouth, heartburn, yawning, weakness, uncontrollable shaking of a part of the body, loss of appetite, weight loss, unusual dreams, stuffy nose, excessive sweating, headache, confusion, weakness, difficulty concentrating or memory problems, sexual problems in males such as decreased sex drive, inability to get or keep an erection, or delayed or absent ejaculation.