Antipsychotics Available as Orally Disintegrating Tablets (ODTs)
Three second-generation antipsychotics are available as orally disintegrating tablets: olanzapine, risperidone, and aripiprazole 1.
Available ODT Formulations
Based on the most recent guideline evidence from ESMO (2018), the following antipsychotics offer ODT formulations:
Second-Generation Antipsychotics with ODTs:
Olanzapine (Zyprexa): Available as ODT with starting doses of 2.5-5 mg 1. This formulation is particularly useful in delirium management and acute agitation settings.
Risperidone (Risperdal): Available as ODT with starting doses of 0.5 mg 1. The guidelines note increased risk of extrapyramidal symptoms if doses exceed 6 mg/24 hours.
Aripiprazole: While mentioned in research literature 2, 3, this third-generation antipsychotic is available as an ODT formulation, though it is administered orally rather than through buccal absorption.
Important Clinical Considerations
Mechanism and Absorption
ODTs do not provide faster onset of action than standard oral tablets 2. These formulations are swallowed and enter circulation via the portal system, just like regular tablets. The primary advantage is preventing medication diversion in patients who might otherwise hide or refuse tablets 2.
Clinical Applications
The ESMO guidelines 1 specifically recommend ODT formulations for:
- Patients with cancer-related delirium
- Situations requiring symptom management where swallowing difficulties exist
- Cases where medication adherence monitoring is needed
Dosing Specifics from Guidelines
Olanzapine ODT 1:
- Initial: 2.5-5 mg p.o. or s.c. stat
- Reduce dose in older patients and those with hepatic impairment
- Caution: Risk of oversedation and respiratory depression when combined with benzodiazepines
Risperidone ODT 1:
- Initial: 0.5 mg p.o. stat
- Can be given up to every 12 hours if scheduled dosing required
- Reduce dose in older patients and those with severe renal or hepatic impairment
- Oral route only (no parenteral formulation)
Common Pitfalls to Avoid
Do not assume faster onset: ODTs dissolve quickly but are absorbed at the same rate as regular tablets since they still require gastrointestinal absorption 2.
Patient cooperation still required: ODTs require at least some patient cooperation and are not suitable for completely uncooperative or severely agitated patients who refuse all oral medications 2.
Not a substitute for parenteral routes: When rapid onset is truly needed in severe agitation, intramuscular formulations remain superior to ODTs 2.
Clozapine ODT exists but is not widely available: Research demonstrates clozapine can be formulated as an ODT 4, but this is not mentioned in clinical guidelines and is not routinely available in most settings.