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Pharmacology ADD/ADHD
Pharmacology ADD/ADHD
74
Medical
Graduate
08/15/2018

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Term
prevalence of ADD/ADHD
Definition
• Most prevalent neurodevelopmental disorder in children
- ~ 10% of all U.S. children diagnosed with ADHD
- 50–60% of child cases persist into adulthood • Average age of diagnosis: 7 years
• Lower educational and occupational performance, attainment, attendance
Term
Etiology and Risk Factors for ADD/ADHD
Definition
- Genetics
• 70–80%heritability
- Male gender
• M:F ratio: 3–4:1
- Environmental
• Leadexposure
• Alcohol/drug/smoking exposure in utero
- Neurobiology
• Impaired functioning of prefrontal cortex/ anterior cingulate cortex
• Deficits in ventral striatal areas
- Low birth weight/prematurity
- Nutritional deficiencies
Term
DSM 5 Diagnostic Criteria for ADD/ADHD
Definition
A.
A persistent pattern of inattention AND/OR
hyperactivity-impulsivity that interferes with functioning or development, as characterized by:
1. Inattention: >6 of the following x > 6 months:
• Fails to give close attention to details/makes careless
mistakes
• Difficulty sustaining attention
• Does not seem to listen
• Does not follow through with instructions and fails to finish work
• Difficulty organizing tasks and activities
• Avoids/dislikes tasks that require sustained mental effort
• Loses things
• Easily distracted
• Forgetful in daily activities
2. Hyperactivity and impulsivity: >6 of the following x >
6 months:
• Fidgets or taps hands/feet, squirms in seat
• Leaves seat often
• Runs around/climbs in inappropriate situations
• Unable to engage in leisure activity quietly
• “On the go” or acting as if “driven by a motor”
• Talks excessively
• Blurts out answers
• Difficulty waiting turn
• Interrupts others

• Several symptoms must be present before age 12
• Present in > two settings
• Interfere with function
• Not better accounted for by another mental disorder
Term
Common Comorbid Conditions for ADD/ADHD
Definition
• Learning and language disorders
• Conduct disorder/oppositional defiant disorder
• Tic disorders
• Autism spectrum disorders
• Bipolar disorder
• Substance use disorder
Term
core symptoms of ADHD
Definition
impulsivity, hyperactivity, inattention
Term
ADHD treatment options
Definition
nonpharmacologic:
• Diet
• Social skills training
• Cognitive behavioral therapy
• School-based interventions
pharmacologic:
• Stimulants
• Non-stimulants
Term
Behavioral interventions: for ADHD
Definition
- Parent training, school interventions: • Most effective for preschool age
• Adjunct in children and adolescents
• Often inferior to medications for core symptoms of ADHD
Term
Diet and dietary supplements: for ADHD
Definition
• Omega-3 fatty acids: Adjunct to pharmacologic
treatmentàminimal side effects, mixed efficacy results in trials
• Iron supplementation if iron deficient
• No evidence of benefit: Vitamin C, vitamin E, St. John’s Wort
• No evidence that sugar or aspartame avoidance improves ADHD symptoms
Term
Methylphenidate (Ritalin®) is what type of medication
Definition
stimulnat
Term
Multimodal ADHD Treatment Study
Definition
• NIMH funded 14-month trial of ADHD treatment (1999)
• Four treatment groups:
1. Methylphenidate
• Titration followed by monthly visits
2. Intensive behavioral therapy (IBT)
• Parent, school, child components
3. Combination of methylphenidate and behavioral therapy
4. Community-based care (control group)
• Included 579 children ages 7–9 years old at trial entry
• 19 primary outcome measures

- Results:
• Reduction in symptoms in all groups
• Medication and combination treatment significantly more effective than IBT or community care alone
• Medication was superior to IBT for reducing core symptoms of ADHD
• Combination therapy resulted in greater improvements in anxiety symptoms, parent-child relationships, social skills, and academic performance • Required lower doses of medications
Term
Preschool ADHD Treatment Study
Definition
•NIMH funded (2006)
Included 165 children ages 3.5–5 years old at trial entry
Randomized to IR methylphenidate or placebo
Results:
• Methylphenidate more effective than placebo at achieving
“excellent” response (2.5-, 5-, 7.5-mg TID)
• Less tolerable in preschool-age children • Higher dropout and adverse effect rates than children > 6 years
• Large treatment response rate (75%) in patients with ≤ 1
comorbid condition
Term
American Academy of Child and Adolescent Psychiatry (2007) treatment guidelines for ADD/ADHD
Definition
• No age stratification
• Published prior to alpha agonists obtaining FDA approval
• First line: Stimulants or atomoxetine
• Second line: Behavioral therapy or alpha agonists, bupropion, tricyclic
antidepressants (TCAs)
Term
American Academy of Pediatrics (2011) treatment guidelies for ADD/ADHD
Definition
• Recommendations based on age
• Preschoolers < 5 years old:
First line: Behavioral therapy
- Second line: Medication (stimulant)
• Children and adolescents (6–18 years old):
- First line: Medication (any FDA-approved med, but stimulants preferable) ± behavioral therapy
Term
ADD/ADHD medication therapy
Definition
1st line: • Stimulants (effect size ~ 0.9
2nd line:
• Atomoxetine (Strattera®) (effect size ~ 0.6)
• Guanfacine (Intuniv®) (effect size ~ 0.5)
• Clonidine (Kapvay®) (effect size ~ 0.5)

3rd line:
• Bupropion (Wellbutrin®)
• Modafinil (Provigil®)
Term
Treatment Take-Aways for ADHD
Definition
- Core symptoms are better treated with medication
- Behavioral/psychosocial interventions help with:
• Long-term management of ADHD
• Treatment of comorbidities
• Self-esteem
• Social skills
• Peer/family relationships
Term
National Survey of Children With
Special Health Care Needs
Definition
• Parent survey 2009–2010
• Children aged 4–17 years
• Findings
• < 33% of children > 6 years old received preferred treatment (combination)
• 50% of preschoolers received behavioral
treatment (1st line for this age group)
Term
Common Adverse Effects of stumulants
Definition
• Decreased appetite • Weight loss
• Headache
• Insomnia
• Abdominal pain
• Dizziness
• Nervousness
• Emotional lability
• Dry mouth
Term
Risks Associated with Excessive Use of stimulants
Definition
• Cardiovascular failure
• Irregular heartbeat
• Hypertension
• Paranoia
*Risk increases significantly when used IV or intranasally
Term
Methylphenidate vs Amphetamines
Definition
Methylphenidate
• FDA approved since 1955
• Approved for use in children > 6 years old (patch 6–12)

Amphetamines
•Dextroamphetamine and
mixed amphetamine salts FDA approved in late
1990s
-Approved for use in children > 3 years old (IR) and > 6 years old (XR)
Term
has MOA blockade of dopamine transporters (minimal effects on norepinephrine)
Definition
Methylphenidate
Term
has MOA Stimulate release of dopamine, norepinephrine
(and serotonin at higher doses)
Definition
Amphetamines, Dextroamphetamine and mixed amphetamine salts
Term
short-acting methylphenidate agents
Definition
Ritalin®/Methylin®
Term
intermediate-acting methylphenidate agents
Definition
Ritalin SR®
Metadate ER®
Methylin ER®
Term
long-acting methylphenidate agents
Definition
Metadate CD®
Ritalin LA®
Concerta®
Daytrana®
Quillivant XR®
Quillichew ER®
Aptensio XR®
Term
Dexmethylphenidate agents
Definition
Focalin®
Focalin XR®
Term
advantages of Immediate Release Methylphenidate
Definition
• Allows for flexible dosing
• Can be split or crushed
• Can be added to long- acting formulation for
additional afternoon coverage
• Simple to discontinue
• Available generically
• Reduces severity of adverse effects
• Reduced abuse potential
• Can be administered once daily (but may require BID dosing)
Term
disadvantages of Immediate Release Methylphenidate
Definition
• Short half-life(~2.5hrs)
• Does not cover ADHD symptoms throughout school day
• Requires 2–3 times daily dosing
• Tablets must be swallowed whole
• Delayed peak (full symptom control may not
occur until afternoon)
Term
• 12-hour duration
• Tablet shell eliminated in stool
• Can be taken with or without food
• Cannot crush or chew (less likely to be snorted)
• Late release may cause insomnia
Definition
Concerta®
Term
• 50/50 mixture of delayed release and IR beads • Contents can be sprinkled on applesauce
• Release is pH dependent (avoid antacids/acid suppressants) • Time to first peak quicker than Concerta®
Definition
Ritalin LA®
Term
• 70/30 mixture of extended-release and IR beads • Should be taken in the morning before breakfast
• Contents can be sprinkled on applesauce
• Approximately 7-hour duration to cover school day
Definition
Metadate CD
Term
• 60/40 mixture of extended-release and IR beads • 12-hour duration
• Contents can be sprinkled on applesauce
Definition
Aptensio XR
Term
• Extended release oral liquid
• 80/20 mixture of extended-release and IR components
• Oral suspension does not require refrigeration • Stable for four months after reconstitution
• 12-hour duration
Definition
Quillivant XR
Term
• Long-acting chewable
• 70/30 mixture of extended-release and IR components
• 8-hour duration
Definition
Quillichew ER
Term
• Transdermal patch
• Not bioequivalent with oral dosage forms
• Patch can be removed any time to customize stimulant exposure • 2-hour delay in effect after application
• Wear no longer than nine hours per day • Apply to hip, do not cut patches
• May have more insomnia, anorexia, and tics than oral forms
Definition
Daytrana
Term
• D-threo enantiomer of racemic methylphenidate
• Dose is half of typical methylphenidate doses
• Available in IR (Focalin® ) and extended-release
(Focalin XR®) formulations
• FocalinXR® release is pH dependent: avoid antacids, proton pump inhibitors, and H2 blockers
• FocalinXR® caps can be opened, sprinkled on applesauce
Definition
Dexmethylphenidate
Term
Amphetamine agents
Definition
Adzenys XR, Dyanavel, Evekeo
Term
Dextroamphetamine
Agents
Definition
Dexedrine, Dexedrine Spansule
Term
Mixed Amphetamine Salts agents
Definition
Adderall, Aderall XR
Term
Lisdexamfetamine agents
Definition
Vyvanse
Term
Amphetamines
Definition
amphetamines, dextroamphetamine, mixed amphetamine salts, lisdexamfetamine
Term
Amphetamine clinical pearls
Definition
• Adzenys XR: first ODT, 50/50 delayed-release and IR particles (similar PK to Adderall XR)
• Dynavel XR: oral suspension, mixture of IR and ER particles
• Vitamin C/fruit juice decreases amphetamine absorption
• Sodium bicarbonate increases absorption
Term
Dextroamphetamine (IR and SR) clinical pearls
Definition
• IR:Forage>3years;SR:>6years • IR available in liquid
Term
Mixed amphetamine salts (IR and ER) clinical pearls
Definition
• Decreased sense of fatigue, mild euphoria, increased motor activity
• IR:Forage>3years;SR:>6years
• IR can be crushed; ER can be opened and put in
applesauce
• ER: 50:50 mix of IR and ER beads
Term
Lisdexamfetamine clinical pearls
Definition
• Oral prodrug converted to dextroamphetamine
• Transformation to active drug in gut prevents
snorting/injecting
• Longest duration of action of amphetamines
• Amphetamine uptake slower: less euphoric effects
• Capsule can be opened and dissolved in water
Term
Atomoxetine (Strattera®) MOA
Definition
Selective norepinephrine reuptake inhibitor
Term
• Less effective than stimulants
• Slower onset of effect (1–4 weeks)
• Longer treatment duration increases probability of response
• Generic became available recently (2017)
Definition
Atomoxetine (Strattera®)
Term
has S/E:• Nausea/vomiting, abdominal pain
• Weight loss, ↓ appetite
• Tachycardia
• Headache
• Insomnia
• Hepatotoxicity
• Myocardial infarction
• Priapism
Definition
Atomoxetine (Strattera®)
Term
Reasonable option for the following populations:
• Patient does not respond to or tolerate stimulants
• Families who want to avoid controlled substances
• Patients or families with history of substance abuse
Definition
Atomoxetine (Strattera®)
Term
Alpha-2 Agonists agents
Definition
Guanfacine ER, clonidine ER
Term
Guanfacine ER, clonidine ER MOA
Definition
Inhibit presynaptic norepinephrine release and increase blood flow to
prefrontal cortex (alpha-2 agonists)
Term
Guanfacine vs. clonidine
Definition
• Longer half-life and duration of action for guanfacine (18 hrs) compared to clonidine (12 hrs)
• Less sedation and dizziness with guanfacine
Term
• Not as effective as stimulants for monotherapy
• May be used to reduce disruptive behavior, control aggression, insomnia, tics
Definition
Guanfacine ER, clonidine ER. Alpha-2 Agonists
Term
Bupropion MOA
Definition
Dopamine reuptake inhibitor
Term
Has ADE: nausea/vomiting, rash, seizure
Definition
Bupropion
Term
• Delayed onset:~two weeks
• No abuse potential, good for comorbid depression
Definition
Bupropion
Term
• Wake-promoting stimulant
• Effective in treatment of ADHDsymptoms
• Not approvable letter from FDA due to skin reactions (including Stevens Johnson Syndrome)
Definition
Modafinil
Term
Cardiovascular ADE of stimulants
Definition
cause minor increases in systolic/diastolic blood pressure and heart rate
- Frequency of sudden death in stimulant-treated children is the same as for the general population
- Recent cohort study showed CV events rare, but twice as likely in stimulant users than non-users
• Alpha-2 agonists cause a symptomatic decreases in blood pressure and heart rate
• AAP,AHA, and AACAP all recommend thorough history and physical exam to detect cardiac disease prior to starting medication (EKG optional)
Term
Appetite and growth ADE of stimulants
Definition
• Loss of appetite common with stimulants, less with atomoxetine
• Height attenuation with stimulants is dose dependent
• Estimated to be approximately 1 cm/year for up to three years of use
• Height/weight/BMI measurements recommended 1–2 times/year
• If growth significantly impacted, consider drug holidays or change of agent
Term
sleep ADE
Definition
• Stimulants
• Insomnia from extended medication effects
vs. rebound of ADHD symptoms when meds wear off
• Atomoxetine and alpha-2 agonists usually sedating
• Evaluate sleep quality and type of disturbance
• Change stimulant formulation
• Change medication
• Rule out comorbid sleep apnea or restless legs
• Add sleep agent
Term
tics ADE
Definition
• Stimulants unlikely to cause new-onset tics
• Stimulants may exacerbate pre-existing tics
• Consider atomoxetine or alpha-2 agonists with comorbid tic disorders
Term
substance abuse ADE
Definition
• Substance use/abuse more common in adolescents with ADHD than age-matched peers
• No evidence that stimulants increase risk of developing substance use disorder
• Screen for patients at higher risk for diversion or abuse
• Consider medications with lower abuse potential in patients with personal or family histories of substance use disorders
Term
psychiatric effects ADE
Definition
• Very low risk of mood disturbances, psychosis, or mania
• Black box warning about suicidal ideation in atomoxetine labeling
Term
seizures ADE
Definition
• 2–3 times more likely in children with ADHD compared to age-matched peers
• No evidence that treatment with ADHD medications increases risk
Term
priapism ADE
Definition
• Rarely reported with atomoxetine and methylphenidate
Term
adverse effects have been associated with stimulant treatment?
Definition
Appetite suppression, tachycardia, tics
Term
Treatment Goals and Expectations for ADD/ADHD
Definition
• Alleviate core symptoms of inattention, impulsivity, and hyperactivity
• Improve functioning at home and school
• Improve academic performance
• Improve social skills
• Decrease classroom disruptions
Term
Treatment Considerations for ADD/ADHD
Definition
• Family wishes
• Past trials
• Anticipated adverse effects
• Available dosage forms
• Comorbid conditions
• Personal/family history of substance abuse
• Cost
Term
ADHD and Conduct Disorder/Oppositional Defiant
Disorder management
Definition
• Stimulants have anti-aggressive effects • 2nd line: Behavioral therapy followed by
antipsychotics/VPA/Lithium
Term
ADHD and Bipolar Disorder management
Definition
• Treat bipolar 1st with mood stabilizer • If ADHD sxs continue, add stimulant
Term
ADHD and Major Depressive Disorder management
Definition
• Treat most disabling condition first
• Depression: CBT, SSRIs, venlafaxine
Term
ADHD and anxiety disorders treatment
Definition
• CBT before or with ADHD treatment
• Consider stimulant or atomoxetine
• Add SSRI if symptoms continue
Term
ADHD and Tic disorders treatment
Definition
• Consider methylphenidate or atomoxetine
• Alpha agonists can improve tics and ADHD sxs
Term
ADHD and substance use disorders treatment
Definition
• 1st: Treat active substance abuse • Can treat both concomitantly
• Use stimulant with low abuse potential or consider non-stimulant
Term
ADHD Drug Interactions
Definition
• Methylphenidate and amphetamines inhibit monoamine
oxidaseàavoid MAOIs
• Methylphenidate can increase blood levels of tricyclic
antidepressants
• CYP2D6 inhibitors increase levels of amphetamine and
atomoxetine
• Combination of stimulants and serotonergic agents (antidepressants/tramadol) may increase seizure or
serotonin syndrome risk
• Use caution co-administering alpha agonists with other
blood pressure lowering medications
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