Does Wellbutrin Cause Dry Mouth?
Yes, dry mouth (xerostomia) is a recognized side effect of Wellbutrin (bupropion), occurring in 10-27% of patients depending on the formulation and dose.[1][2] It stems from bupropion's anticholinergic properties, which reduce saliva production by affecting muscarinic receptors in salivary glands.
How Common Is Dry Mouth on Wellbutrin?
In clinical trials:
- Immediate-release: Up to 27% of users.
- Sustained-release (SR): 10-20%.
- Extended-release (XL): Around 10-15%.[1][3]
Higher doses (e.g., 300-450 mg/day) increase incidence. It often starts within the first week and may lessen over time as the body adjusts.
Why Does It Happen and What Can Help?
Bupropion weakly blocks acetylcholine at salivary glands, similar to some antidepressants but milder than tricyclics.[4] Management includes:
- Sugar-free lozenges or gum to stimulate saliva.
- Hydration and humidifiers.
- Over-the-counter saliva substitutes like Biotene.
Consult a doctor before stopping; dose reduction or switching formulations can help.
Compared to Other Antidepressants
Wellbutrin causes less dry mouth than SSRIs (e.g., Paxil at 18-25%) or SNRIs (e.g., Cymbalta at 10-15%), making it a preferred option for those sensitive to this effect.[1][2] Zoloft reports under 10%, but Wellbutrin's rate is still notable.
When to Worry About Dry Mouth
Mild cases are common and benign, but persistent dry mouth raises risks for dental issues like cavities or infections.[4] Seek medical advice if accompanied by difficulty swallowing, sores, or if it persists beyond 2-4 weeks. It's rarely a reason to discontinue alone.
[1]: FDA Label for Wellbutrin XL
[2]: Drugs.com Side Effects
[3]: PubMed Review on Bupropion
[4]: Mayo Clinic on Antidepressant Side Effects