What is the recommended protocol for switching from Abilify (Aripiprazole) 10mg to Lurasidone?

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Switching from Aripiprazole 10mg to Lurasidone

Start lurasidone at 40 mg once daily with food (at least 350 calories) while simultaneously tapering aripiprazole to 50% of the original dose (5 mg) by day 7, then discontinuing aripiprazole completely by the end of week 2. 1, 2

Switching Protocol

Week 1

  • Day 1: Start lurasidone 40 mg once daily with food (minimum 350 calories required for optimal absorption) 1, 3
  • Days 1-7: Continue aripiprazole 10 mg daily alongside lurasidone 2
  • Day 7: Reduce aripiprazole to 5 mg (50% of original dose) 2

Week 2

  • Continue lurasidone 40 mg once daily with food 2
  • Continue aripiprazole 5 mg through week 2 2
  • End of Week 2: Discontinue aripiprazole completely 2

Weeks 3-6

  • Continue lurasidone 40 mg once daily, or increase to 80 mg if clinically indicated after week 2 2
  • Flexible dosing between 40-120 mg/day is appropriate based on clinical response 1, 2

Dosing Considerations

No initial titration of lurasidone is required—the recommended starting dose is 40 mg once daily. 1, 3 The maximum recommended dose is 160 mg/day, though doses above 80 mg/day may not confer additional benefit and can increase adverse effects like somnolence and akathisia. 1, 3

Food requirement is critical: Lurasidone must be taken with at least 350 calories to achieve adequate absorption—administration with food increases AUC approximately 2-fold and Cmax approximately 3-fold. 1

Alternative Switching Strategies

Based on a randomized switching study, three approaches were equally effective: 2

  • 40 mg/day for 2 weeks (then flexible dosing)
  • 40 mg/day for week 1, then 80 mg/day for week 2 (then flexible dosing)
  • 80 mg/day for 2 weeks (then flexible dosing)

The first approach (40 mg for 2 weeks) is recommended as the safest starting point, particularly given aripiprazole's partial D2 agonist properties versus lurasidone's full D2 antagonist profile. 2

Monitoring and Expected Outcomes

Treatment failure rates are low (7.9% in switching studies), with most failures occurring within the first 2 months. 2 The median time to treatment failure was 58 days in extension studies. 4

Common adverse effects during the switch include: 4, 2

  • Akathisia (12.5% incidence, though only 0.4% discontinue due to this)
  • Insomnia (8.8%)
  • Nausea (8.8%)
  • Somnolence

Metabolic advantages: Unlike many antipsychotics, lurasidone shows minimal weight gain and no clinically meaningful changes in glucose, lipids, insulin, or prolactin—mean improvements in weight and lipids are often observed. 4, 2

Important Drug Interactions

Contraindicated: Do not use lurasidone with strong CYP3A4 inhibitors (ketoconazole, clarithromycin, ritonavir). 1

Dose reduction required: If moderate CYP3A4 inhibitors (diltiazem, erythromycin, fluconazole) are used, reduce lurasidone dose to half the original level. 1

Avoid: Strong CYP3A4 inducers (rifampin, carbamazepine) are contraindicated as they significantly reduce lurasidone efficacy. 1, 3

Special Populations

Renal impairment: Start at 20 mg/day; maximum 80 mg/day for moderate-to-severe impairment (CrCl <50 mL/min). 1

Hepatic impairment: Start at 20 mg/day; maximum 80 mg/day for moderate impairment, 40 mg/day for severe impairment. 1

Elderly or frail patients: Consider starting at lower doses and monitoring closely for orthostatic effects and movement disorders. 5

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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