Do Not Split Bupropion Extended-Release Tablets
You should never split a bupropion extended-release (XL) tablet to divide the dose into 300 mg now and 150 mg later. The FDA drug label explicitly states that bupropion hydrochloride extended-release tablets (XL) "should be swallowed whole and not crushed, divided, or chewed" 1.
Why Splitting Extended-Release Formulations Is Dangerous
Splitting extended-release bupropion tablets destroys the controlled-release mechanism, which can lead to:
- Immediate release of the full dose rather than gradual absorption over 24 hours
- Significantly increased seizure risk due to higher peak blood levels—bupropion already carries a dose-dependent seizure risk that increases with doses above 300 mg daily or with rapid dose escalation 1
- Unpredictable and uneven dosing since extended-release tablets cannot be accurately divided 2, 3
Correct Dosing Strategy
If you need to take 300 mg daily of bupropion XL:
- Take one 300 mg tablet once daily in the morning 1
- If starting therapy, begin with 150 mg once daily for 4 days, then increase to 300 mg once daily 1
- The entire 300 mg dose should be taken at one time in the morning, not split throughout the day
When Dose Splitting Is Appropriate
The only scenario where splitting bupropion doses applies is when using the sustained-release (SR) formulation (not XL):
- Bupropion SR 150 mg can be taken twice daily (morning and afternoon) for a total of 300 mg daily 4, 5
- This is a different formulation designed for twice-daily dosing
- Even then, individual tablets should not be physically split
Critical Safety Point
Splitting extended-release tablets can result in overdose through uncontrolled release of the active ingredient 2. With bupropion specifically, this dramatically increases seizure risk—the drug is already contraindicated in patients with seizure disorders and carries warnings about dose-dependent seizure risk 1.
If you cannot swallow a 300 mg XL tablet whole, discuss alternative formulations with your prescriber rather than attempting to split it.