My doctor and the pharmacist said it's should start working on the third day but it didn't
If in doubt, RTM: https://www.drugs.com/pro/zyban.html
Treatment with Zyban should be initiated before the patient’s planned quit day, while the patient is still smoking, because it takes approximately 1 week of treatment to achieve steady-state blood levels of bupropion. The patient should set a “target quit date” within the first 2 weeks of treatment with Zyban.
To minimize the risk of seizure:
Begin dosing with one 150-mg tablet per day for 3 days.
Increase dose to 300 mg per day given as one 150-mg tablet twice each day with an interval of at least 8 hours between each dose.
Do not exceed 300 mg per day."
- Zyban Information for Consumers
- Zyban Information for Healthcare Professionals (includes dosage details)
- Side Effects of Zyban (detailed)
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