more information on Wellbutrin Xl 300 Mg the Wellbutrin Xl 300 Mg please see the Forum How To's. Symptoms of an allergic reaction include: Wellbutrin Xl 300 Mg , itching, swelling, severe dizziness, trouble breathing, muscle aches, joint pain, fever. Since this drug may cause sleeplessness at first, it is best Wellbutrin Xl 300 Mg to take near bedtime. This is not a complete list of side effects and others may occur. Your family or other caregivers should also be alert to changes in your mood or symptoms. Wellbutrin may cause seizures, especially in people with certain medical conditions or when using certain drugs. SIDE EFFECTS: The most commonly noted side effects associated with bupropion are agitation, dry mouth , insomnia , headache , nausea, constipation , and tremor. Decreased Wellbutrin Xl 300 Mg weights were seen at 50 mg/kg and greater. Patients should be told that the excessive use or abrupt discontinuation of alcohol or sedatives (including benzodiazepines) may alter the seizure threshold. This seizure incidence (0. Wellbutrin was well tolerated was. MOTHERS: It is not known if bupropion is secreted in breast milk. Smoking in.