If a medication were to cause side effects (wellbutrin xr) would it be immediate or could it occur on day five of taking them? i had none days 1-4. will they go away? (chest pain?

Side effects such as chest pain may or may not be related to the medication. Consult with the physician who prescribed the medication.

It is best to discuss medication with your Psychiatrist who knows your medical history for a thorough evaluation and recommendations for treatment. If you are not confident with your Doctor please see another for a 2nd opinion. Have a physical exam to rule out illness and see a Clinical Psychologist with expertise in multiple forms of psychotherapy .