Possible Side Effects:
Zyban is generally well tolerated. Dry mouth, headache, increased sweating, constipation, anxiety and fatigue may occur. If these effects persist or worsen, notify your doctor.

Drug Interactions:
Before taking Zyban tell the prescribing doctor of all nonprescription and prescription medications you may use especially MAO inhibitors (e.g., isocarboxazid, phenelzine, tranylcypromine, pargyline, selegiline, furazolidone), levodopa, theophylline, corticosteroids (e.g., prednisone), seizure medications, sedatives, ritonavir, tranquilizers/psychiatric drugs (e.g., chlorpromazine), other antidepressants (e.g., amitriptyline), salicylates (e.g., aspirin, salsalate), isoniazid, chlolinesterase inhibitors (e.g., tacrine, donepezil), morphine, and adrenaline-like drugs (e.g., pseudoephedrine).

Excess caffeine intake can increase the chance of seizures with Zyban. Check all nonprescription/prescription drug labels for caffeine. Consult doctor or pharmacist. A certain product used to help quit smoking contains bupropion. Do not take that product while using this one.

Missed Dose:
Take any missed dose of Zyban as soon as possible but not if it is within 8 hours of the next dose. If it is time for the next dose, skip the missed dose and resume your regular schedule. Do not "double up" the dose.

Additional information:
Do not allow anyone else to take your Zyban.