Can I discontinue aripiprazole (Abilify) 2 mg orally daily and start lurasidone (Latuda)?

Can You Abruptly Stop Abilify 2mg and Start Latuda?

No, you should not abruptly stop aripiprazole 2mg and immediately start lurasidone without a cross-titration strategy. While the low dose of aripiprazole (2mg) reduces the risk of severe withdrawal symptoms, a gradual transition is still recommended to minimize potential discontinuation effects and ensure therapeutic continuity.

Recommended Switching Strategy

Cross-titration approach:

• Start lurasidone at 40mg daily with food (at least 350 calories) 1
• Continue aripiprazole 2mg for 1-2 weeks while initiating lurasidone
• Gradually taper aripiprazole over 1-2 weeks while maintaining lurasidone
• Monitor closely for symptom exacerbation or emergence of akathisia

This approach is supported by evidence showing that cross-titration strategies (overlapping the medications while tapering the original agent) are generally safer than abrupt switches 2. The study by Casey et al. demonstrated that switching strategies involving gradual tapering produced comparable outcomes with manageable tolerability profiles.

Key Clinical Considerations

Aripiprazole discontinuation concerns:

• At 2mg daily, you're using a very low dose (typical therapeutic range is 10-30mg for schizophrenia)
• While aripiprazole discontinuation syndrome has been reported 3, the risk is lower at this minimal dose
• However, even low doses can cause withdrawal symptoms including insomnia, anxiety, and nausea
• Aripiprazole has a long half-life (~75 hours), which provides some natural tapering effect

Lurasidone initiation specifics:

• Must be taken with food containing at least 350 calories - this is critical for absorption 1
• Starting dose: 40mg daily is standard; 80mg may be considered if rapid symptom control is needed 4
• Common early side effects include akathisia (13%), extrapyramidal symptoms (14%), and somnolence (17%) 1
• Both aripiprazole and lurasidone can cause akathisia, so monitor carefully during the transition 5

Monitoring During the Switch

Watch for these specific issues:

• Akathisia emergence: Both medications can cause this distressing symptom. If it develops, consider dose reduction or adjunctive propranolol/benzodiazepines 5
• Symptom exacerbation: Monitor for worsening psychosis, agitation, or mood symptoms weekly during the first month
• Metabolic improvements: Patients switching to lurasidone often experience weight reduction and improved metabolic parameters 6, 7
• Prolactin normalization: If elevated on aripiprazole, levels should normalize on lurasidone

Practical Implementation

Week 1-2:

• Start lurasidone 40mg with substantial meal (>350 calories)
• Continue aripiprazole 2mg daily
• Assess tolerability, particularly for akathisia and sedation

Week 2-3:

• If lurasidone is well-tolerated, reduce aripiprazole to 1mg daily for 3-7 days
• Then discontinue aripiprazole completely

Week 4:

• Continue lurasidone monotherapy
• Assess efficacy and consider dose adjustment (can increase to 80mg if needed for symptom control) 1

Important Caveats

Drug interactions to verify:

• Ensure patient is not taking strong CYP3A4 inhibitors (ketoconazole, clarithromycin, ritonavir) or inducers (rifampin, St. John's wort, phenytoin) - these are contraindications for lurasidone 1
• Grapefruit juice must be avoided with lurasidone 1

When immediate switch might be considered:

• If the patient is experiencing intolerable side effects from aripiprazole that require urgent discontinuation
• Even then, starting lurasidone while stopping aripiprazole the same day is preferable to stopping aripiprazole without replacement

The evidence consistently supports cross-titration over abrupt switching for antipsychotics 2. While your 2mg dose is low and theoretically safer for abrupt discontinuation, the small additional effort of a brief overlap period significantly reduces risk of symptom destabilization and provides better clinical outcomes.