nora d. volkow, m.d. director national institute on drug abuse · 2019-11-14 · therapies for...
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Nora D. Volkow, M.D. Director
National Institute on Drug Abuse
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For Opiate Addiction • Methadone • Naltrexone • Buprenorphine • Buprenorphine/Naloxone
Medications Currently Available
For Nicotine Addiction • Nicotine Replacement Therapies (NRT) • Bupropion • Varenicline
For Alcoholism • Disulfiram • Naltrexone • Acamprosate • Naltrexone Depot • Topiramate
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Therapies for Smoking Cessation
• 7 FDA approved pharmaco-therapies:
- 5 NRT and 2 non-NRT
• Cessation treatment has limited efficacy after 6 months
Only 20% using pharmacotherapy are abstinent for more than a year.
Treatment Abstinence Rate at 6 mo, %
Self-help and Quitline 8.5% and 12.7%
Counseling alone 14.6%
* Varenicline (2mg/day and 1 mg/day) 33.2% and 25.4%
* Bupropion SR 24.2%
* Nicotine patch 23.4%
Medication and counseling 27.6%
* Treating Tobacco Dependence in Light of the 2008 US Department of Health and Human Services Clinical Practice Guideline
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Varenicline & Bupropion SR Combination Therapy for Smoking Cessation
Ebbert JO et al., Nic Tobacco Research 2009;11(3):234-239.
0
10
20
30
40
50
60
70
80
Varenicline +
Bupropion
Varenicline Bupropion
3 months
6 months
7-d
ay
po
int-
pre
vale
nce
smo
kin
g a
bst
inen
ce r
ate
s
71%
58%
50%
33% 36%
25%
reported smoking
Gonzales et al., 2006;Jorenby et al., 2006
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Full and Partial Agonists vs Antagonists Treatment Strategies for Opioid Addiction
effect
no effect
agonist antagonist
an agonist drug has an active site of similar shape to the endogenous ligand so binds to the receptor
and produces the same effect
an antagonist drug is close enough in shape to bind to the receptor but not close enough to produce an effect. It also
takes up receptor space and so prevents the endogenous
ligand from binding O
pio
id E
ffec
t
Full Agonist (Methadone)
Partial Agonist (Buprenorphine)
Antagonist (Naloxone)
Log Dose
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Normal Control
Methadone Maintained Patient
Source: Kling et al., JPET, 2000.
Specific Binding
[18F]cyclofoxy (m ligand)
30-35 % receptor occupancy for
methadone doses > 80 mg a day
Specific Binding
[11C]carfentail (m ligand)
27-47 % occupancy for 2mg Bup
85-92% occupancy for 16 mg Bup
94-98% occupancy for 32 mg Bup
Greenwald, MK et al., Neuropsychoph, 2003.
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C = Counseling Only C+M = Counseling & Methadone Started in Prison
11%
85% 80%
C
64%
46%
C + M
% of 180 days post-release on treatment
% of 180 days post-release used heroin
Gordon, MS et al., Addiction 103:1333-1342, 2008.
Treatment Linkage & Days Used Heroin
6 Months Post-release
70%
60%
50%
40%
30%
20%
10%
0%
90%
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Per
cen
t Treatment Retention in HIV-Infected Patients Receiving Buprenorphine/Naloxone (n=303)
% Retained
% Not Retained
% Lost to
Follow-Up
Fiellin DA et al., JAIDS 2011; 56(Suppl 1) S33-S38.
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IMPLANTABLE buprenorphine -- Probuphine™
Ling, W. et al. JAMA 2010;304:1576-1583
120
100
80
60
40
20
0
Nu
mb
er o
f P
ati
ents
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Week
Buprenorphine
Placebo
Retention of Patients Through the Trial
Trials required for FDA approval finished; could be available in 2013
Delivers buprenorphine for 6 months
(Titan Pharmaceuticals)
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Although We Do Have Treatments That Work
We Face Some Major Challenges in Using Them
• Criminal Justice System’s
Reluctance to Use
• Many Countries’
Reluctance to Use
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Krupitzky et al.,
unpublished
Placebo: N=124
XR-NTX: N=126
IM Injection
every 4 weeks
for 24 weeks
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NO Medications to Treat Addictions to:
• Cocaine Addiction
• Methamphetamine Addiction
• Marijuana Addiction
Vaccines as a promising strategy
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B cells produce antibodies
Cocaine bound to cholera toxin B
Antibodies enter the
bloodstream When cocaine is introduced into
the bloodstream, antibodies bind it
Shen XY, Orson FM and Kosten TR, Clin Pharm & Ther 2012; 91(1): 60-70.
Mechanism of Action of Vaccine Against Cocaine Addiction
No vaccine: Quick absorption at the Blood-brain barrier
Vaccine-stimulated antibodies delay absorption
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Targeting Brain Circuits Involved in Addiction
Hipp
MEMORY/ LEARNING
Amyg
VP REWARD
EXECUTIVE FUNCTION
MOTIVATION/ DRIVE
OFC
INHIBITORY CONTROL
D. Striatum
PFC
NAcc
ACG
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Potential Targets for Medications Development
Kappa opioid receptor antagonists (JDTic)
Dopamine (D3) receptor antagonists (Buspirone)
5HT2A receptor antagonists
5HT2C receptor agonists (Lorcarserin)
mGluR5 receptor antagonists (Fenobam)
mGluR2/3 allosteric modulators
CRH1 antagonists
FAAH inhibitors
Orexin antagonists
NK-1 antagonists
Biologics (vaccines, mAbs, engineered enzymes)
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Pharmaceutical Companies that have Reduced or Eliminated Psychiatry Research from their
Portfolios within the Past 3 Years
• GlaxoSmithKline
• Novartis
• Astra-Zeneca
• Sanofi-Aventis
• Cephalon
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IOM Recommendations: Overcome Critical Market Barriers
Government Funding of New Drug Development
Expansion and Enhancement of Substance Abuse Treatment System
Guaranteed Market
Extended Market Exclusivity
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Vaccines
• Human studies
Nicotine vaccine
Cocaine vaccine
• Preclinical studies
Heroin vaccine
Methamphetamine vaccine
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Naltrexone & Buprenorphine for the TX of Cocaine
Rate
s (%
) of
Posi
tive
Uri
nes
fo
r
Co
cain
e M
eta
boli
tes
Gerra G et al., J Psychopharmacol Online First January 9, 2006.
0
5
10
15
20
25
30
35
40
45
Week 1 Week 4 Week 12
3 37
40
42
18
33
9
--Naltrexone Alone
--Naltrexone + Buprenorphine
Cubic-root transformed longest duration of cocaine abstinence
Mu
Op
ioid
Rec
epto
rs B
PN
D
Ghitza et al 2010
Mu Opioid Receptors are Increased in Cocaine Abusers
and this is Associated with more Cocaine Use during Tx
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Colfax GN et al., Arch Gen Psychiatry 2011; 68:1168-1175.
Clinical Trials for Medications for METH
Elkashef et al., Neuropsychopharm 2008;
33:1162-1170.
BUPROPION MIRTAZAPINE
Percentage of Patients with METH-Free Urine Week Baseline Low Meth Use
Study week elapsed since randomization
100
90
80
70
60
50
40
30
20
10
0
-2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12
p=0.03
GEE fitted lines Bupropion Placebo
Group means Bupropion Placebo T
esti
ng
Po
siti
ve
for
Met
ha
mp
het
am
ines
,%
Mirtazapine (n=30) Observed Fitted
Placebo (n=30) Observed Fitted
0 2 3 4 5 6 7 8 9 10 11 12 (30;30) (28;27) (25;23) (27;27) (27;22) (26;27) (26;25) (27;24) (26;24) (23;23) (23;23) (27;27)
Study Week (No. of Placebo Arm; Mirtazapine Arm Samples)
100
80
60
40
20
0
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Ret
enti
on
Pro
bab
ilit
y
1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
Placebo
Dronabinol
0 1 2 3 4 5 6 7 8
Week
8
7
6
5
4
3
2
1
0
WD
S s
core
Placebo
Dronabinol
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Visit
Retention Rates in
Dronabinol Treated vs Placebo
Withdrawal Discomfort Score in
Dronabinol Treated vs Placebo
Levin FR et al., Drug and Alcohol Dependence 2011; 116: 142-150.
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Current Status of Anti-cocaine/Anti-nicotine Vaccines in Clinical Trials
Shen XY, Orson FM and Kosten TR, Clin Pharm & Ther 2012; 91(1): 60-70.
Vaccine Target Status Characteristics Company Country
TA-CD
Cocaine
Cocaine Phase IIB Cholera toxin B
conjugate
Celtic
Pharmaceuticals
United
Kingdom
NIC002 Nicotine Phase II Virus-like vaccine Cytos Biotechnology/
Novartis
Switzerland
TA-NIC
Nicotine Phase II A recombinant cholera
toxin conjugate
Celtic
Pharmaceuticals
United
Kingdom
NicVax Nicotine Phase III A bacterial exoprotein Nabi
Biopharmaceuticals/
GlaxoSmithKline
United
States
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Pharmacological Strategies to Attenuate Nicotine Reinforcement and Alleviate Withdrawal
D’Souza MS and Markou A. Addiction Science and Clinical Practice July 2011: 4-16.