Side effects of Wellbutrin SR include agitation, constipation, dizziness, dry mouth, insomnia, nausea, rash, sweating, and/or weight loss. Side effects of
Wellbutrin XL may include abdominal pain, agitation, anxiety, constipation, diarrhea, dizziness, dry mouth, heart palpitations, increased urination, insomnia, muscle soreness, nausea, rash, ringing in the ears, sore throat, and/or sweating.