Do Not Split Bupropion XL Tablets
Bupropion XL tablets should never be split, crushed, divided, or chewed. The FDA drug label explicitly states that bupropion hydrochloride extended-release tablets (XL) "should be swallowed whole and not crushed, divided, or chewed" 1. If your patient requires only 150 mg, prescribe the 150 mg XL tablet formulation instead.
Why Splitting Extended-Release Formulations Is Dangerous
The extended-release (XL) mechanism depends on the intact tablet structure to deliver medication gradually over 24 hours. Splitting destroys this controlled-release system, which creates two critical safety risks:
Seizure risk escalation: Bupropion lowers the seizure threshold in a dose-dependent manner. Splitting an XL tablet releases the full dose rapidly instead of gradually, creating dangerously high peak blood levels that substantially increase seizure risk 2.
Loss of therapeutic effect: The remaining portion loses its extended-release properties, resulting in subtherapeutic dosing and treatment failure.
The Correct Approach for 150 mg Dosing
Simply prescribe bupropion XL 150 mg tablets 1. The FDA-approved dosing for major depressive disorder starts at 150 mg once daily in the morning, which can be maintained or increased to 300 mg after 4 days if needed 1. The 150 mg strength exists specifically for patients who need this dose—there is no need to manipulate a higher-strength tablet.
For smoking cessation, guidelines consistently recommend starting at 150 mg once daily for 3 days, then increasing to 150 mg twice daily if tolerated (using the SR formulation for twice-daily dosing, or maintaining 150 mg XL once daily) 3, 2.
Common Pitfalls to Avoid
Never assume extended-release tablets can be split just because they're scored. Even scored extended-release tablets should not be split—the score line exists only for identification purposes, not to indicate the tablet is splittable 4. Research demonstrates that splitting extended-release formulations causes non-homogeneous drug distribution and unpredictable dosing 5.
Do not attempt to "save money" by splitting higher-strength tablets. While tablet splitting may reduce costs for immediate-release medications, the safety risks with extended-release bupropion far outweigh any potential savings 4, 6.
If cost is a concern, discuss generic options or patient assistance programs rather than compromising safety through tablet manipulation.