Key Points
- Bupropion (Wellbutrin) is an atypical antidepressant primarily used to treat depression and aid in smoking cessation.
- Wellbutrin works by inhibiting the reuptake of dopamine and norepinephrine, enhancing the signaling of these neurotransmitters in the brain.
- Bupropion is notable for its ability to promote weight loss and its lack of sexual side effects, making it distinct from other antidepressants.
- It is contraindicated in patients with eating disorders such as bulimia or anorexia nervosa due to an increased risk of seizures.
- Side effects of Bupropion include tachycardia, insomnia, and headaches.
- Patients should avoid alcohol and not crush or chew the pills, as both can heighten the risk of seizures.
Mechanism of Action
- Bupropion inhibits the reuptake of norepinephrine and dopamine, increasing their levels in the brain to improve mood and reduce cravings.
- It does not affect serotonin, making it different from most antidepressants like SSRIs and SNRIs.
- Bupropion’s lack of impact on serotonin helps avoid side effects like sexual dysfunction, often seen with other antidepressants.
- Its stimulant-like effects can also promote weight loss, though it may cause insomnia or increased heart rate in some patients.
Indications
- Bupropion is used to treat Major Depressive Disorder (MDD), Persistent Depressive Disorder (PDD), and Seasonal Affective Disorder (SAD).
- It also aids in smoking cessation, reducing withdrawal symptoms by mimicking nicotine’s effects on the brain.
- Typically prescribed as a 2nd or 3rd line treatment for depression after SSRIs, and can be used as adjunctive therapy.
- Classified as an atypical antidepressant, it offers an alternative treatment option, especially for patients who don’t respond well to SSRIs.
Side Effects
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Seizures are the primary side effect of bupropion.
- It lowers the seizure threshold, and the risk increases with higher doses.
- Contraindicated in patients with a history of seizure disorders, bulimia, or anorexia nervosa
- Crushing or chewing the pills increases absorption and raises the seizure risk.
- Patients should limit alcohol intake, as it can further lower the seizure threshold.
- Does not cause sexual side effects, unlike SSRIs, which often cause sexual dysfunction.
- Promotes weight loss, in contrast to SSRIs and mirtazapine, which can cause weight gain.
- Side effects like tachycardia, insomnia, and headaches may occur.
- Increased risk of suicidal behavior early in treatment, particularly in adolescents and young adults.
Bonus Mnemonic: “BUPROPION”
- B - Bulimia and anorexia nervosa contraindicated (due to seizure risk)
- U - Under no circumstances should the dose be doubled if missed
- P - Pill must be taken at the same time every day
- R - Risk of seizures increases with higher doses
- O - Overuse of alcohol lowers the seizure threshold further
- P - Pills must not be crushed or chewed (raises absorption and risk of seizures)
- I - Increased risk of seizures in patients with a history of seizure disorders
- O - Out of control seizures are the primary side effect
- N - No sexual side effects
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