SO MANY OPTIONS, SO LITTLE FOCUS: NAVIGATING THE...
Transcript of SO MANY OPTIONS, SO LITTLE FOCUS: NAVIGATING THE...
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SO MANY OPTIONS, SO LITTLE FOCUS: NAVIGATING THE WORLD OF ADHD MEDICATIONS
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Learning Objectives
• Differentiate the spectrum of medications available for ADHD based on pharmacokinetic and clinical profiles
• Customize ADHD medication selection to the daily functional needs of the patients
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Undertreatment of Adult ADHD
• The 2012 and 2013 National Health and Wellness Survey (NHWS), US study
• Of a total of 22,397 US adults who participated in the survey, 465 self-reported a diagnosis of ADHD. ADHD-like symptoms were screened using the adult self-report scale version 1.1 (ASS-v1.1)
• In patients who self-reported an ADHD diagnosis, 62.6% reported not currently using a prescription medication to treat it
Adler LA, Faraone SV, Sarocco P, Atkins N, Khachatryan A. Symptom burden among self-reported ADHD in adults in the United States. Poster presented at: US Psych Congress: September 16-19, 2017: New Orleans, Louisiana.
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Prevalence Rates of Psychiatric Disorders in U.S. Adults
Kessler RC et al. JAMA. 2003 Jan 18;278(23):3095-105. Kessler RC et al. Am J Psychiatry. 2006 Apr;63(4):415-24. Merikangas KR et al. Arch Gen Psychiatry. 2007 May;64(5):543-52. Michielsen M et al. Br J Psychiatry 2012;201:298-305.
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ADHD in Adults Age >50
• Adult ADHD prevalencelongitudinal aging study Amsterdam (LASA)
• Prevalence of syndromic ADHD in adults: 2.8%
• Prevalence of symptomatic ADHD in adults: 4.2%
• Men and women reported similar levels of symptoms
Michielsen M et al. Br J Psychiatry 2012;201:298-305.
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Identification and Assessment of Late-Life ADHD in US Memory Clinics
• ONLY 1 of 5 clinics reported screening regularly for ADHD (62 of 165 sites responded to survey)
• 1/2 reported seeing ADHD patients
–60% reported contact with previously diagnosed ADHD patients
• ADHD symptomatology may not have been considered as pre-morbid baseline cognitive functioning
Fischer BL et al. J Att Dis 2012;16(4):333-338.
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Diagnostic Issues
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Age of Diagnosis
SYMPTOMS
IMPAIRMENTS
AGE 7 12 18 25 32 55
Child Diagnosis
Adult Diagnosis
IMPAIRMENTS
Increasing demands of Family, Work, Social
Intelligence Compensatory Skills Environmental Structure
Adult Diagnosis
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ADHD
Emotionaldysregulation
Executive Dysfunction
Impairment Sources
Performance Impairment
Social Impairment
©David W. Goodman, M.D.
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Adult ADHD and Comorbidities
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Case Presentation: Diagnostic Prioritization for Pharmacotherapy
Alcohol and substance abuseMood disorders
Bipolar and MDD
Anxiety disorders Obsessive-compulsive disorder,
generalized anxiety disorder, panic
ADHD
Goodman D. Treatment and assessment of ADHD in adults. In: Biederman J, ed. ADHD Across the Life Span: From Research to Clinical Practice—An Evidence-Based Understanding. Hasbrouck Heights, NJ: Veritas Institute for Medical Education, Inc.2005.
Order of treatment also considers the severity of the concurrent disorders.
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Research Support for Diagnostic Prioritization
“In our clinical experience, consistently with other authors, patients with ADHD-BD should be treated for BD first. Based on the current level of information, we do not recommend treatment of comorbid ADHD-BD with ADHD medications in the absence of mood stabilizers.”
Giulio P, Giulia V. Expert Opinion on Pharmacotherapy. 2015.16:14;2193-2204; Asherson P et al. Curr Med Res Opin 2014;30(8):1657-72.
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Bipolar Disorder: Risk of Mania With Methylphenidate
• Swedish national registries
• 2307 bipolar adults, 2006-2014
• MPH with and without mood stabilizers
• Mania defined: hospitalization or new dispensation of stabilizing medication
• 0-3 months and 3-6 months after medication start following non-treated periods
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Bipolar Disorder: Risk of Mania With Methylphenidate
HAZARD RATIO0-3 months 3-6 months
MPH without mood stabilizer
6.7 (95%CI=2.0-22.4) similar
MPH with mood stabilizer
0.6 (95%CI=0.4-0.9)
similar
Viktorin A et al. The Risk of Treatment-Emergent Mania with Methylphenidate in Bipolar Disorder. Am J Psych 2016.
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Treatment Options and Medication
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Treatment Options
•Diagnoses (what’s there, what’s not)
•Education (what this is, what it’s not)
•Environmental changes (academic, occupational, social, family)
•Psychopharm/Psychotherapies
• Behavior, social, individual, family, couples• Support associations (www.CHADD.org)
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How Formulation Influences Medication Effects:Pharmacokinetics
Formulation
Absorption
Distribution
Metabolism
Elimination
Onset of action
Offset effects (rebound)
Consistency of plasma levels across time
Variability of plasma levels across patients
Duration of action
Parent drug/active metabolites
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Formulation Effects on Plasma Concentration
Plas
ma
conc
entra
tion
Start of treatment
Time
Toxic level
Desired effect
A
B
C
Stahl SM, Wets KM. Clin Neuropharmacol 1988;11:1-17.
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Coating
• Differences in drug release depending on type of coating
• Insoluble
• pH dependent
• Slowly erodible
Lecomte F et al. Pharmaceut Res 2004;21(5):882-90.
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Osmotic Controlled-ReleaseOral Delivery System (OROS)
Stahl, Mignon. Stahl’s Illustrated Attention Deficit Hyperactivity Disorder 2009.
Coating: drug,binders
Semipermeablerigid membrane
Third compartment:molecules that react with water
Second compartment:high concentration of drug
First compartment:low concentration of drug
Opening
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Transdermal Patch
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Transdermal Formulations:Patch
Impermeablecoveringmembrane
DrugAdhesive
skin
Capillary
Stahl, Mignon. Stahl’s Illustrated Attention Deficit Hyperactivity Disorder 2009.
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Transdermal Formulations
Advantages
• Avoids first-pass metabolism (may reduce side effects, increase efficacy)
• Steady plasma concentrations• Longer duration of action
Disadvantages• Patches can be large/visible• Local skin irritation/rash• Patches may inadvertently
come off• Proper disposal
Muramatsu RS et al. Am J Geriatr Pharmacother 2010;8(2):98-114.
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Adapted from Wilens TE, Spencer T. In: Handbook of Substance Abuse: Neurobehavioral Pharmacology. New York, NY: Plenum Press; 1998:501.
Stimulant Mechanisms of Action
v v Storagevesicle
DA Transporterprotein
Cytoplasmic DA
MPH and AMPH inhibit
AMPH is taken up into cell
Presynaptic Neuron
AMPH
AMPH diffuses intovesicle, causing DA release into cytoplasm
AMPH blocks uptake into vesicle
ATOX, DES
AMPH causes release of DA and NE through transporter
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Methylphenidate PreparationsPreparation Duration of ActionGeneric methylphenidate 2-3 hrs tablet
Methylin liquid 2-3 hrs liquid
MPH SR LA
4 hrs wax matrix8 hrs beaded (50%:50%)
OROS MPH 12 hrs OROS
MPH ER 6-8 hrs beaded
MPH CD 8 hrs beaded (30%:70%)
MPH chewable 8 hrs chewable
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Methylphenidate PreparationsPreparation Duration of ActionDexMPH XR 3 hrs tablet
10 hrs beaded
MPH Delayed ER (PM dosing) beaded
MPH ER liquid 12 hrs liquid
MPH (long duration) 16 hrs Beaded (20%:80%)
MPH-ODT ER 12 hrs dissolvable tab
MPH transdermal patch 12 hrs patch
MPH XR Peaks at 2 hrs and then again at 8 hrs (biphasic)
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Amphetamine Preparations
Preparation Duration of Action
Liquid AMPH 2-3 hrs liquid
Dextrostat 2-3 hrs tablet
Dextroamphetaminespanules
4 hrs tablet6 hrs beaded
Amphetamine (racemic) 6 hrs tablet
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Amphetamine Preparations
Preparation Duration of Action
Mixed AMPH saltsXRTriple beaded
6 hrs tabletUp to 12 hrs beaded (50%:50%)Up to 16 hours beaded (33%:33%:33%)
d-Amphetamine-ODT ER 12 hrs Dissolvable tab
d-Amphetamine ER 12 hrs liquid
Lisdexamfetaminechewable
Up to 14 hrs prodrugUp to 14 hrs chewable
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Triple-Bead Mixed Amphetamine Salt
• Triple-bead mixed amphetamine salts (MAS) formulation that may help with improved attention, with once-daily dosing
• Dosing: 12.5 to 25 mg once a day (>13 yo) or 50 mg (adults)• Capsules: 12.5, 25, 37.5, 50 mg• Duration of action: 16 hours (onset at 2-4 hours)
Frick G et al. J Atten Disord. 2017;:1087054717696771; Brams M et al. J Child Adolesc Psychopharmacol. 2018;28(1):19-28.
Product Name Daily Dosage Tmax (mean, hours) T1/2 (mean, hours)
Triple-bead mixed amphetamine salt
1 d-l-amphetamine: 7-10 (in children)
d-l-amphetamine: 8 (in adults)
d-amphetamine: 10-11(in children & adults)
l-amphetamine: 10-13(in children & adults)
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Triple-Bead Technology
Immediate-release bead
Extended-release bead I
Extended-release Bead II
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Differences Between Mixed Amphetamine Salts
Mixed amphetamine salts (MAS)
Release characteristics Duration of effect
MAS IR 100% immediate-release table ~ 6 hours
MAS XR 2 types of beads per capsule
- 50% immediate release- 50% delayed release (pH 5.5)
~ 12 hours
Triple-bead MAS 3 types of beads per capsule:
- 33% immediate release- 33% delayed release (pH 5.5)- 33% delayed release (pH 7.0)
~ 16 hours
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Non-Stimulants
• Atomoxetine
• Guanfacine ER• Clonidine ER
Off-label:• Bupropion (3 positive controlled adult trials)• Desipramine (positive adult trial)• Modafinil
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FDA-Approved Medications for Adults With ADHD
Medication Child dosing
Adolescent dosing
Adult dosing
U.S. trials (adult)
Atomoxetine 0.5 mg/kg (<70kg)max 1.2 mg/kg (max 100 mg)
40mgmax 100 mg
120 mg
Dexmethylphenidate XR 5mgmax 20 mg
10 mgmax 20 mg
40 mg
Lisdexamfetamine 30 mgmax 70 mg
30 mgmax 70 mg
30 mgmax 70 mg
70 mg
Mixed amphetamine salts XR 10 mgmax 30 mg
20 mgmax-none
60 mg
OROS Methylphenidate HCL 18 mgmax 54 mg
18 mgmax 72 mg
18 or 36 mgmax 72
108 mg
Mixed amphetamine salts triple bead 12.5 mgmax 25 mg
12.5 mgmax 50 mg
75mg
DAILY
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ADHD Medication Sequencing
Methylphenidate Amphetamine
Delivery System TechnologyBeaded
(IR/ER ratio, double/triple beaded)(beads-ph dependent, non-ph dependent)
OROS (osmotic release)Microparticles (liquid/dissolvable tabs/chewables)
PatchAtomoxetine Guanfacine
Clonidine
Efficacy
Duration/Side effects
©David W. Goodman, M.D.
Monotherapy
Adjunctive
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Dosing in mgs for ADHD medication is primarily based on:Weight/ Height
No weight or height correlations for optimal dosingPediatrics has weight guidelines but there is tremendous dose variability
with patientsDelivery system
No delivery system is consistently better for all patientsSymptom reduction
Easily assessed clinically and with symptom rating scalesImpairment reduction
Impairment arise from both ADHD and executive symptomsObserver reports
Helpful but only observed behavior that is context specific
Primary Considerations for Dosing
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CYP450 Inhibitory Effects of ADHD Medications
Goodman D. (2006), In: ADHD Across the Life Span: From Research to Clinical Practice—An Evidence-Based Understanding; Biederman J, ed. Hasbrouck Heights, NJ: Veritas Institute for Medical Education, Inc.; Devane L et al. (2003), Poster presented at the 156th Annual Meeting of the APA; San Francisco: May 17-22.
00000Desipramine
?+++???Bupropion
00*000Atomoxetine00000Methylphenidate00000Amphetamine
3A42D62C192C91A2Medication
Cytochrome P450 Isoenzymes
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Psychotherapies
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Psychotherapies for ADHD• Education
• Patients and family members• Books and websites
• Cognitive behavior therapy• Structure routines• Audio and visual cues• Consistent consequences for behavior
• Individual• Self-esteem issues• Social skills and relationship issues• Academic and occupational accommodations38
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When to Refer
• Presenting with symptoms of a major mental illness, serious mood disorder, substance dependence, or other complex comorbid psychiatric symptoms that are beyond your level of clinical competence and/or comfort level
• Confused about the patient’s presentation, unsure about ADHD, and/or uncomfortable about the idea of prescribing ADHD medication for this person
• Suspect drug-seeking behavior
• Patient not responding to medications or expresses sensitivity to drug side effects
• Treatment seems to require multiple psychiatric medications
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Summary
• Many existing medications and/or medication combinations are available in a variety of formulations to serve individual patients’ needs
• Clinicians need to consider both compound and delivery system when planning a pharmacologic algorithm
• Delivery systems will provide unique effects both intra-patient and inter-patient
• Unique characteristic of a patient (ie age, comorbidities) will influence compound and technology choices
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Posttest Question 1
In rank order of prevalence compared to other major psychiatric disorder, ADHD in adults is
1.First2.Second3.Third4.Fourth5.Fifth6.Sixth
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Posttest Question 2
Dosing in mgs for ADHD medication is primarily based on:
1. Weight2. Height3. Delivery system4. Symptom reduction5. Impairment reduction6. Observer reports