Call your doctor at once if you have a serious side effect such as: 1  headache with chest pain and severe dizziness, fast or pounding heartbeats, shortness of breath, fainting; 2  diarrhea that is watery or bloody;  fever, swollen glands, body aches, flu symptoms, new or worsening cough;
The maximum daily doses is also slightly different as both Wellbutrin XL and Wellbutrin have a maximum daily dose of 450 mg per day, whereas the maximum dosage for Wellbutrin SR is only 400 mg per day.
2. Dosage (100 mg, 150 mg, 300 mg) + Subtype (IR, SR, XL) The dose that you took of Wellbutrin can be significant when it comes to withdrawal. If you were on the highest possible dose, you are going to need to conduct a gradual taper to avoid most withdrawal effects.