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Drugs Contraindicatedin
DementiaJoseph H. Flaherty, M.D.Division of Geriatric MedicineSaint Louis University Health Sciences CenterSt. Louis VA Medical Center GRECC
Downloaded from www.pharmacy123.blogfa.com
Drugs Contraindicatedin
Dementia:Propensity to Cause
Mental Status Change
1. Attitude: High index of suspicion
2. Skills: a. Awareness of “at risk” patients
b. Identify subtle mental status changes
3. Knowledge: specific categories/drugs
Drugs Contraindicated in Dementia:Propensity to cause mental status change
ANY* DRUGcan cause
Mental Status ChangeRefs: “Almost any” Lipowski ZJ, NEJM 1989; “Virtually any” Carter GL, Drug Safety 1996
Attitude
CNS Vulnerability in Medically Ill PersonsAlzheimer’s Dementia Cholinergic System*
Vascular Dementia Circulation
Parkinson’s Dopaminergic &Cholinergic
*Noradrenergic & Serotonergic systems may play role here too.
Skills
PHARMACOKINETICS (moving the drug through)
Medically Ill PersonsPostgastrectomy, Malabsorption
CHF, Dehydration, Malnutrition Renal or Hepatic Insufficiency
Skills
Age……Disease Process ---->>>>>
Fun
ctio
nal C
apac
ity
Function
Dys-Function
“EAMA student”
80 y/o NH resident with dementia
Fun
ctio
nal C
apac
ity
Age……Disease Process ---->>>>>
Skills
ANTICHOLINERGICS
#1DELIRIUM
Knowledge
The POWER of ANTICHOLINERGICS
1% scopolamine eye drops scopolamine transdermal patch
Ref: Danielson et al. 1981, MacEwan et al. 1985
Knowledge
DRUGS THAT
CAUSE DELIRIUM
DRUGS THAT
CAUSE DELIRIUM
ACUTECHANGE
IN MS
Knowledge
DRUGS THAT CAN CAUSE A CHANGE IN MENTAL STATUS
A C I MC H N SU AT NE G
E
Levodopa, Bromocriptine, Amantadine• Up to 20% of pt.s• Most at risk: pt.s with cortical atrophy
Refs: Cummings 1991; DeSmet et al. 1982
ACUTE CHANGE IN MS
Antiparkinsonian Drugs
CORTICOSTEROIDS “Steroid psychosis” Dose related
• Up to 18% if >80 mg/day
Variety of MS changes: depressive/manic, paranoid/hallucinatory, confusion
Withdrawal may precipitateRefs:Ling PH, 1981, Glaser GH, 1953,VonArnim T 1976 (book), Dixon RB, 1980
ACUTE CHANGE IN MS
URINARY INCONTINENCE Action: (-) muscarinic action of
acetylcholine on smooth muscle, i.e. ANTICHOLINERGIC• Oxybutinin (DITROPAN*),
Flavoxate (URISPAS) Retention=>DeliriumIncontinence
ACUTE CHANGE IN MS
THEOPHYLLINE “Theophylline madness”
• Hyperactive periods with periods of withdrawal and mutism
• May herald onset of seizures Usually related to toxic levels
Refs: Wasser WG 1981, Culberson CG 1979,Paloucek FP 1988
ACUTE CHANGE IN MS
EMPTYING DRUGS Metoclopramide (REGLAN) Antagonism of peripheral and central
dopamine receptors (x-es BBB!) Restlessness, drowsiness, depression,
confusion
Refs: Anderson H 1994, Bottner RK 1985, Fishbain DA 1987, Ritchie IH 1997
ACUTE CHANGE IN MS
CV DRUGS Clonidine Digoxin Antiarrhythmics (PDQ) Beta-blockers Calcium Channel Blockers
Refs: Hoffman & Ladogana 1981; Jacobson et al. 1987; Eisendrath & Sweeney 1987; Kuhr 1979; McGahan et al 1984.
ACUTE CHANGE IN MS
H2 BLOCKERS Widely Prescribed => Increases Chances Anticholinergic?
• Physostigmine can reverse cimetidine induced delirium
Older persons with Renal Insuf.
Refs: Jenike & Levy 1983, Schentag et al. 1979
ACUTE CHANGE IN MS
ANTIMICROBIALS Mostly case reports
• Ciprofloxacin, Sulfamethoxazole, Cephalosporins, Procaine PCN, Clarithromycin, Gent, Tobra, Strepto
• Isoniazid• Acyclovir• Chloroquine, Quinacrine
ACUTE CHANGE IN MS
NARCOTICS Acute users > Chronic users
• e.g. hospitalized pt Meperidine (DEMEROL) - metabolite
normeperidine has anticholinergic effects Tramadol (ULTRAM) - centrally acting
pain med
ACUTE CHANGE IN MS
GEROPSYCHIATRY DRUGSGEROPSYCHIATRY DRUGS
Act centrally >> risk Mechanisms are not “pure” TCAs vs SSRI’s
• Anticholinergic vs hyponatremia, serotonin syndrome, interactions
BDZ’s
ACUTE CHANGE IN MS
ENT Antivertigo medications
• Meclizine (ANTIVERT), dimenhydrinate (DRAMAMINE)
• AntihistaminIC action: STRONG• Anticholinergic action: WEAK, but present
ACUTE CHANGE IN MS
ENT Cold/Sinus medications: ANY
• Antihistamine “DANGER” – chlorpheniramine, astemizole
• Decongestant “DANGER” – sympathomimetics: pseudoephedrine
• Expectorant & Antitussive- probably okay– guaifenesin & dextromethorphan
• COMBINATIONS “DANGER”
ACUTE CHANGE IN MS
INSOMNIA DRUGS OTC may be worse than RX
Antihistamine (Diphenhydramine)
“Anything”-PM Withdrawal Insomnia
(and daytime anxiety)
ACUTE CHANGE IN MS
NSAIDS ANY Most Risky: Protein Bound Indomethacin: Don’t use in older
persons
ACUTE CHANGE IN MS
MUSCLE RELAXANTS Action: Centrally Acting
Does not directly relax tense skeletal muscles. Through sedation =>
relaxes muscles
Methacarbamol (ROBAXIN)Carisoprodol (SOMA)Chlorzoxazone (PARAFON FORTE)
ACUTE CHANGE IN MS
SEIZURE DRUGS
Related to serum levels Protein bound? Usually drowsiness, occasional agitation,
depression, psychosis
ACUTE CHANGE IN MS
1. Attitude: High index of suspicion-> Almost ANY drug can cause MS changes
2. Skills: Curve of Life & awareness of subtle mental status changes
3. Knowledge:
Drugs Contraindicated in Dementia:THoM
ACUTE CHANGE IN MS
DRUGS THAT CAN CAUSE A CHANGE IN MENTAL STATUS
ANTIPARKINSON CV DRUGS INSOMNIA MUSCLE RELAX.
CORTICOSTER. H2 BLOCKERS NSAIDS SEIZURE
URIN INCONT ANTIBIOTICS
THEOPHLLYINE NARCOTICS
EMPTYING DRUGS GERO-PSYCH
ENT
Why Older Persons So Susceptible to Psychiatric Side Effects
Pharmacodynamics CNS Vulnerability
Pharmacokinetics How the body Absorbs Distributes Metabolizes Excretes
Starting a New Drug1. How is it going to ACT on my patient
?
2. How is itgoing toMOVE THROUGHmy patient
?
ANXIETYANXIETY Caffeine
• Inc. Sensitivity; May be in OTC’s Sympathomimetics
• i.e. most Cold/Sinus meds• e.g. SUDAFED, ENTEX, NEO-SYNEPHRINE
Withdrawal from:• Alcohol, Narcotics, Sedative-Hypnotics
ANXIETYANXIETY Thyroxine Antiparkinsonian (L-Dopa,
Bromocriptine)• 10-15% will develop anxiety
Theophylline
Ref: Cummings 1991
DEPRESSIONDEPRESSION
Reser
pine
Methyldopa
Propranolol
“...the rest of the story.”(Paul Harvey)
DEPRESSIONDEPRESSION Reserpine
• Catecholamine depleting antihypertensive
• 20% of pt.s
• Generally resolves with discontinuation
Ref: Goodwin & Bunney 1971
DEPRESSIONDEPRESSION Methyldopa
• Antihypertensive, effective and inexpensive• metabolite a-methyl norepinephrine
=> potent a2-adrenergic agonist
3.6%(Only 1.1% warranted d/c of drug)
Ref: Paykel et al. 1982. Reviewed 65 clinical trials, n=2,320 patients.
DEPRESSIONDEPRESSION Propranolol
• B-adrenoreceptor antihypertensive• Lipophilic => crosses BBB
Atenolol• Less lipophilic => probably <1%
1.1%
Ref: Paykel et al. 1982. Reviewed 65 clinical trials, n=2,320 patients.
DEPRESSIONDEPRESSION Clonidine
• Centrally acting a-agonist antihypertensive
1.5%
Ref: Paykel et al. 1982. Reviewed 65 clinical trials, n=2,320 patients.
DEPRESSIONDEPRESSION Digoxin
• Even at therapeutic levels• Watch it: undernourished, dehydrated, or
renally impaired older persons H2 Blockers
• Not just Cimetidine Corticosteroids
Refs: Pascualy & Veith 1989, Billings & Stein 1986, Billings et al. 1981
HALLUCINATIONSHALLUCINATIONSC (Dig, PDQ) I (Dir. & Indir.) M (Frail Elderly)
H (Usu. other MS) N (Indomethacin) S (Frail Elderly)
A (Definitely: Dopa & Antichol)
N (Possible)
G (Of course)
E (Dir. & Indir.)
Risk Factors for Psychiatric Side Effects of Drugs
Risk Factors for Psychiatric Side Effects of Drugs
Age More MEDs, more ADE’s OTC users Brain Dysfunction Medical Illnesses
RecommendationsRecommendations Identify those at RISK Remember: ANY drug can do it Don’t add ‘til you TAKE AWAY Don’t be afraid to TAKE AWAY
GUIDELINES for Medication Reduction
GUIDELINES for Medication Reduction
JUST DO IT Caution: Taper
• Clonidine, B-blockers, Reserpine, Narcotics, BDZ’s, Corticosteroids, Barbituates
Careful but DO IT (esp if pt in hosp!)• Cardiac drugs (digitalis, antiarrhythmics)
Close follow-up!• Home care, social worker
DrugsDrugs
OTC >>> Rx
300,000* 65,000
*Includes different package sizes, dose strengths, and forms.Ref: 1995 PDR for Nonprescription Drugs
$13 Billion/Year in America
Increases 8-10%/year
OTC’s(Over the Counter Drugs)
Ref:1995 PDR for Nonprescription DrugsNote: Total Health Care Expenditures = $750 Billion in 1991
Self-Medication with OTC’sSelf-Medication with OTC’s
Frequency % of Consumers
Frequently 76%Occasionally 17%Rarely 4%Never 1%No Response 2%
Ref: Gannon 1990.
How People Treat Common Health Complaints with OTC’s
How People Treat Common Health Complaints with OTC’s
Treatment 1982 1992
Treated with OTC 35% 38%Not treated 37% 30%Treated-Home remedy 14% 16%Treated-Previous Rx 11% 13%Sought Prof. help 9% 17%
Ref: Heller Research Group. 1992. n=1500; average person suffered 6 probs/2 wk
“ADE’s”
ADVERSE DRUG EVENTS
“ADE’s”
ADVERSE DRUG EVENTS
2-3 x More Likely to Happen in Older Persons
Ref:Vestal & Cusak 1990
Hospital Admissions for “ADE’s”
Hospital Admissions for “ADE’s”
0
2
4
6
8
10
12
14
16
18
1st Qtr 2nd Qtr 3rd QtrAll Hosp. Age >65 Psych Adm’s Adm’s
%
Ref.s: Beard 1992,Col 1990, Nelson& O’Malley 1988.
DELIRIUM: INSOMNIA DRUGS
DELIRIUM: INSOMNIA DRUGS
OTC may be worse than RX
Antihistamine (Diphenhydramine)
“Anything”-PM Withdrawal Insomnia
(and daytime anxiety)
Pharmacodynamics: CNS Vulnerability
Neuronal cell number Neurotransmitter production and
breakdown Pre- and post-synaptic receptors CNS concentration of drugs
Skills
ANTICHOLINERGICS
60% of NH Residents
23% of Community Dwelling Elders
TAKE AT LEAST ONE
Ref: Blazer et al. 1983
Knowledge
INCONTINENCE-BOWEL i.e. IRRITABLE BOWEL SYNDROME Action: ANTICHOLINERGIC Hyoscyamine (DONNATAL, LEVSIN,
LEVSINEX), Dicyclomine (BENTYL)
DONNATAL = Atropine + Hyoscyamine + Scopolamine +
Phenobarbital
ACUTE CHANGE IN MS