Hello, I understand your concern. As with all anti psychotics, an array of side effects is also associated to Arip (Aripiprazole). Some of the most common side effects of this drug are dizziness, constipation, headaches, anxiety, lack of sleep and weight gain. If side effects such as trouble swallowing, drooling, difficulty speaking, shaking, stiff limbs, trouble walking, muscle twitches and uncontrollable movements of the body please seek immediate help. Unfortunately, there is no way to predict which side effects, if any, your son will develop while on this drug. It differs from person to person and the only thing you can do is to stay on the look out for the symptoms I mentioned above. I hope this helps. Wishing you and your son good health and all the best.