Can Rexulti (Brexpiprazole) Tablets Be Split?
The FDA label for Rexulti does not explicitly authorize or provide instructions for tablet splitting, and the medication is available in six different strengths (0.25 mg, 0.5 mg, 1 mg, 2 mg, 3 mg, and 4 mg) specifically to allow precise dosing without the need for splitting. 1
Key Considerations
Tablet Formulation and Available Strengths
- Rexulti tablets are manufactured as round, shallow convex, bevel-edged tablets with specific dose markings, available in six strengths ranging from 0.25 mg to 4 mg 1
- The availability of multiple low-dose formulations (including 0.25 mg and 0.5 mg) suggests the manufacturer designed the product to avoid the need for tablet splitting 1
- The FDA label provides detailed dosing instructions with specific titration schedules but makes no mention of tablet splitting as an acceptable practice 1
Practical Implications
If dose adjustments are needed, use the commercially available tablet strengths rather than splitting tablets. The FDA-approved dosing regimens for brexpiprazole involve gradual titration using intact tablets of different strengths 1:
- For schizophrenia in adolescents: Start at 0.5 mg daily, increase to 1 mg on days 5-7, then to 2 mg on day 8, with weekly 1 mg increments as needed 1
- For agitation in Alzheimer's dementia: Start at 0.5 mg daily for 7 days, increase to 1 mg for days 8-14, then to 2 mg on day 15 1
- For dose reductions (CYP2D6 poor metabolizers or drug interactions): Use half the recommended dosage by selecting the appropriate lower-strength tablet 1
Evidence on Antipsychotic Tablet Splitting
While general research on tablet splitting exists, there are important caveats:
- Studies on antipsychotic tablet splitting (including aripiprazole, a structurally similar D2 partial agonist) have shown variable weight uniformity, with 15-16% of half tablets falling outside acceptable specifications 2
- Tablet characteristics such as size, shape, and hardness significantly affect splitting accuracy 2, 3
- For patients with schizophrenia prescribed risperidone (another antipsychotic), tablet splitting did not worsen clinical outcomes but was associated with increased unscheduled appointments, particularly in the first 60 days, suggesting patient difficulty 4
Clinical Recommendation
Order the appropriate tablet strength rather than instructing patients to split tablets. This approach:
- Ensures accurate dosing, which is particularly important given brexpiprazole's specific receptor binding profile and dose-dependent efficacy 1
- Avoids potential confusion in patients with cognitive impairment (relevant for the Alzheimer's agitation indication) 5, 6
- Eliminates concerns about dose variability that could affect the medication's narrow therapeutic window for efficacy versus side effects 1
If cost is a concern driving consideration of tablet splitting, note that while some facilities have reported cost savings with antipsychotic splitting programs 7, the availability of six different Rexulti strengths makes this unnecessary and potentially problematic for maintaining consistent therapeutic dosing.