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Intranasal Drug Delivery in Neuropsychiatry: Focus on Intranasal Ketamine for Refractory Depression Chittaranjan Andrade, MD

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Intranasal Drug Delivery in Neuropsychiatry: Focus on Intranasal Ketamine for Refractory Depression Chittaranjan Andrade, MD Intranasal Drug Delivery in Neuropsychiatry: Focus on Intranasal Ketamine for Refractory Depression Chittaranjan Andrade, MD Clinical Question Each month in his online 1 2,3 column, Dr Andrade Intravenous ketamine infusion has been found safe and effective considers theoretical and as a treatment for medication-refractory depression; suicidal symptoms practical ideas in clinical also attenuate.4 The benefits, however, are transient and seldom persist psychopharmacology beyond 1–2 weeks.5 Some data suggest that repeated infusions, such with a view to update as on alternate days, prolong the duration of response.6 However, the knowledge and skills of medical practitioners frequently repeated intravenous ketamine infusion is not a practical who treat patients with treatment strategy for maintenance therapy in patients who relapse after psychiatric conditions. response to ketamine and subsequent maintenance with conventional Department of Psychopharmacology, National Institute antidepressant medication. So, how may ketamine responders be treated of Mental Health and Neurosciences, Bangalore, India ([email protected]). in the long term to prolong the treatment response? Introduction Medications in neuropsychiatric practice are most commonly ABSTRACT administered either orally or parenterally. Intranasal drug delivery Intranasal drug delivery (INDD) systems offer (INDD) systems, however, have been available for decades; there a route to the brain that bypasses problems is a large body of animal literature on the subject, this route of drug related to gastrointestinal absorption, first-pass administration has long been used in several medical fields, and, more metabolism, and the blood-brain barrier; onset of recently, INDD has gained importance even in neuropsychiatry. This therapeutic action is rapid, and the inconvenience article will examine INDD in neuropsychiatry with particular focus on and discomfort of parenteral administration are the use of intranasal ketamine in the treatment of refractory depression. avoided. INDD has found several applications in neuropsychiatry, such as to treat migraine, Why Deliver Drugs Intranasally? acute and chronic pain, Parkinson disease, disorders of cognition, autism, schizophrenia, INDD systems cater to different situations and needs that are not social phobia, and depression. INDD has also necessarily mutually exclusive (Table 1). These are briefly discussed been used to test experimental drugs, such as below. peptides, for neuropsychiatric indications; these Local action. In otorhinolaryngologic practice, medications have for drugs cannot easily be administered by other long been administered intranasally (as drops or sprays) for local action. routes. This article examines the advantages and In neuropsychiatry, a patient may require a nasal decongestant if a applications of INDD in neuropsychiatry; provides stuffy nose results from the use of sildenafil or a tricyclic antidepressant examples of test, experimental, and approved drug.7,8 INDD treatments; and focuses especially on the Rapid onset of action. INDD is associated with a fast onset of action. By downloading this file, you are agreeing to the publisher’s Terms & Conditions. Terms & to the publisher’s agreeing you are this file, By downloading potential of intranasal ketamine for the acute and This is because there is quick drug absorption from the rich, intranasal maintenance therapy of refractory depression. vascular bed. Peak blood levels are rapidly attained.9 As examples, J Clin Psychiatry 2015;76(5):e628–e631 sumatriptan nasal spray10 and intranasal lidocaine11 both afford rapid (doi:10.4088/JCP.15f10026). relief from acute migraine. Nicotine nasal spray affords rapid relief from © Copyright 2015 Physicians Postgraduate Press, Inc. craving in nicotine-dependent individuals.12 Bypassing the blood-brain barrier. INDD can deliver drugs directly to the central nervous system, bypassing the blood-brain barrier. Absorption occurs through the olfactory epithelium, and transport through the cribriform plate, via the olfactory pathways, into the brain.9 An example is the use of insulin spray as an experimental treatment 13 This work may not be copied, distributed, displayed, published, reproduced, transmitted, modified, posted, sold, licensed, or used for commercial purposes. purposes. commercial for or used licensed, sold, posted, modified, transmitted, reproduced, published, displayed, distributed, not be copied, may work This for cognitive decline and Alzheimer’s disease. INDD can also be used to study brain functioning. For example, a peptide that interferes with the interaction between D1 and D2 receptors was shown to have antidepressant action in the forced swim test in rodents for up to 2 hours after intranasal administration. Inhibition of D1-D2 receptor interaction was demonstrated in the prefrontal cortex.14 © 2015 COPYRIGHT PHYSICIANS POSTGRADUATE PRESS, INC. NOT FOR DISTRIBUTION, DISPLAY, OR COMMERCIAL PURPOSES. J© Clin 201 Psychiatry5 COPYRIGHT 76:5, MayPHYSICIANS 2015 POSTGRADUATE PRESS, INC. NOT FOR DISTRIBUTION, DISPLAY, OR COMMERCIAL PURPOSES. e628 Chittaranjan Andrade Intranasal drug delivery (INDD) systems allow for improved Table 1. Reasons to Consider Intranasal Drug Delivery ■ Systems bioavailability, avoidance of the inconvenience and Intranasal drug delivery is used in different situations and to cater to discomfort of parenteral administration, rapid onset of different needs that are not mutually exclusive: therapeutic action, and bypassing of the blood-brain barrier. 1. For local action 2. For faster onset of action ■ INDD has been used for test, experimental, and approved 3. To bypass the blood-brain barrier indications to treat conditions such as migraine, acute and 4. For better bioavailability chronic pain, Parkinson disease, disorders of cognition, 5. To avoid parenteral administration schizophrenia, social phobia, autism, and refractory depression. Table 2. Examples of Experimental Intranasal Drug Delivery Clinical Points ■ Intranasal ketamine is emerging as a potential alternative to Applications in Neuropsychiatry intravenous ketamine infusions for patients with refractory Lidocaine nasal drops for acute migraine depression; at present, however, the data are limited, and so Intranasal ketamine for acute and chronic pain, autism, depression, and other conditions the treatment remains emphatically experimental. Intranasal oxytocin for schizophrenia, autism, and other conditions Intranasal neurosteroids for social anxiety Intranasal insulin and other treatments for mild cognitive impairment Improvement of bioavailability. INDD can improve and early Alzheimer’s disease Intranasal ropinirole for Parkinson disease bioavailability of drugs such as peptides that may be digested Intranasal treatments for brain tumors rather than absorbed after oral administration. Examples of approved and experimental treatments include desmopressin for pediatric15 and geriatric16 enuresis, insulin for disorders also being studied for the prevention of posttraumatic stress of cognition,13 and oxytocin for a variety of experimental disorder in persons who experience trauma.30 indications (see below). Avoidance of parenteral administration. INDD can Intranasal Ketamine improve the convenience of drug administration, as Intranasal ketamine attenuates pain in the emergency with intranasally administered ketamine17 in place of room in children31 and adults.32 Intranasal ketamine also intravenously infused ketamine for patients with refractory reduces the severity of pain in migraine.33 Wink et al34 depression. reported a 29-year-old woman with autism who was treated Table 2 lists a few examples of INDD applications in with intranasal ketamine (20–60 mg) on 12 dosing occasions neuropsychiatry; in this regard, ketamine and oxytocin are across 6 weeks. She showed improvements in mood, social perhaps the best-studied agents. Aqueous (4%) lidocaine interactions, flexibility, tolerance of changes in routine, nasal drops have demonstrated rapid efficacy in episodes of motivation, and concentration. Adverse events were mostly acute migraine.11 Intranasal ropinirole18 and other intranasal mild; the most prominent was headache, which lasted for treatments are being studied for Parkinson disease, and up to 10 hours after a treatment. A case report also showed intranasal insulin and other treatments are being studied for benefits with intranasal ketamine in depression.35 mild cognitive impairment and early Alzheimer’s disease.13,19 In a randomized, double-blind, saline-controlled, crossover A neurosteroid, PH94B, was successfully trialled for social trial conducted in 20 patients with major depression, Lapidus anxiety in women.20 INDD is also being studied for brain et al17 found that a single intranasal dose of ketamine (50 mg) neoplasms.21 This list is not exhaustive. outperformed saline by 7.6 points on the Montgomery-Asberg Depression Rating Scale as assessed 24 hours after dosing; the Intranasal Oxytocin response rate was 44% vs 6%, respectively. Anxiety ratings also Intranasal oxytocin may influence social relationships decreased significantly more with ketamine. However, there and has been much studied in this regard; notwithstanding was no significant separation between ketamine and saline at the media hype over this so-called love hormone, research 3 and 7 days posttreatment. In this study, intranasal ketamine has not resulted in straightforward conclusions.22,23 was well tolerated, with few, mild, and very transient adverse
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