Mosby's 2014 Nursing Drug Reference (365 page)

BOOK: Mosby's 2014 Nursing Drug Reference
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Canada only   Side effects:
italics
= common;
bold
= life-threatening   
Nurse Alert

scopolamine
ophthalmic

 

selegiline (Rx)

(se-le′ji-leen)

Eldepryl, Emsam, Zelapar

Func. class.:
Antiparkinson agent

Chem. class.:
MAOI, type B

Do not confuse:
Eldepryl
/enalapril

ACTION:

Increased dopaminergic activity by inhibition of MAO type B activity; not fully understood

USES:

Adjunct management of Parkinson’s disease for patients being treated with levodopa/carbidopa who had poor response to therapy; depression (transdermal)

Unlabeled uses:
Alzheimer’s disease, depression

CONTRAINDICATIONS:

Children/adolescents (suicide/hypertensive crisis), hypersensitivity, breastfeeding

Precautions:
Pregnancy (C)

DOSAGE AND ROUTES
Calculator

• Adult:
PO
10 mg/day given with levodopa/carbidopa in divided doses, 5 mg at breakfast and lunch; after 2-3 days, begin to reduce dose of levodopa/carbidopa 10%-30%;
ORAL DISINTEGRATING
1.25 mg (1 tab) × 6 wk or more initially then 2.5 mg (2 tabs) dissolved on tongue daily before breakfast; max 2.5 mg/day;
TRANSDERMAL
6 mg/24 hr initially, increase by 3 mg/24 hr at ≥2 wk, up to 12 mg/24 hr if needed

Alzheimer’s disease (unlabeled)

• Adult:
PO
5 mg bid
AM, PM

Available forms:
Tabs 5 mg; caps 5 mg; oral disintegrating tabs 1.25 mg; transdermal 6 mg/24 hr (20 mg/20 cm
2
), 9 mg/24 hr (30 mg/30 cm
2
), 12 mg/24 hr (40 mg/40 cm
2
)

Administer:
PO route

 
Do not use in children due to risk for hypertensive crisis

• 
Product until NPO before surgery

• 
Adjust dosage to response

• 
With meals; limit protein taken with product

• 
Dosing bid in
AM
and afternoon; avoid
PM
or bedtime dosing

• 
At doses of <10 mg/day because of risks associated with nonselective inhibition of MAO

• 
Oral disintegrating tab:
peel back foil; remove tab, do not push through foil; place tab on tongue, allow to dissolve, swallow with saliva

Transdermal route

• 
Apply to dry, intact skin on upper torso, upper thigh, or outer surface of upper arm q12hr

SIDE EFFECTS

CNS:
Increased tremors, chorea, restlessness, blepharospasm, increased bradykinesia, grimacing, tardive dyskinesia, dystonic symptoms, involuntary movements, increased apraxia, hallucinations,
dizziness
, mood changes, nightmares, delusions, lethargy, apathy, overstimulation, sleep disturbances, headache, migraine, numbness, muscle cramps, confusion, anxiety, tiredness, vertigo, personality change, back/leg pain,
suicide in child/adolescent, suicidal ideation in adults

CV:
Orthostatic hypotension, hypo/hypertension, dysrhythmia, palpitations, angina pectoris,
tachycardia,
edema,
sinus bradycardia,
syncope,
hypertensive crisis (children)

EENT:
Diplopia, dry mouth, blurred vision, tinnitus

GI:
Nausea, vomiting, constipation, weight loss, anorexia, diarrhea, heartburn, rectal bleeding, poor appetite, dysphagia, xerostomia

GU:
Slow urination, nocturia, prostatic hypertrophy, urinary hesitation, retention, frequency, sexual dysfunction

INTEG:
Increased sweating, alopecia, hematoma, rash, photosensitivity, facial hair

RESP:
Asthma, SOB

PHARMACOKINETICS

Absorption (tab) 40-90 min, (oral disintegrating tab) 10-15 min; peak 1/2-2 hr; rapidly metabolized (active metabolites:
N
-desmethyldeprenyl, amphetamine, methamphetamine); metabolites excreted in urine; half-life 10 hr, orally disintegrating tab 1.3 hr; protein binding up to 85%

INTERACTIONS

 
Fatal interaction: opioids (especially meperidine); do not administer together

 
Serotonin syndrome (confusion, seizures, fever, hypertension, agitation); death—FLUoxetine, PARoxetine, sertraline, fluvoxaMINE (discontinue 5 wk before selegiline treatment); do not use together

 
Fatal interaction: do not use with tricyclics

Increase:
side effects of levodopa/carbidopa

Increase:
unusual behavior, psychosis —dextromethorphan

Increase:
hypotension—antihypertensives

Drug/Lab Test

Decrease:
VMA

False positive:
urine ketones, urine glucose

False negative:
urine glucose (glucose oxidase)

False increase:
uric acid, urine protein

NURSING CONSIDERATIONS
Assess:

• 
Parkinson’s symptoms:
decreased rigidity, unsteady gait, weakness, tremors

• 
Cardiac status: tachycardia/bradycardia; B/P, respiration throughout treatment

• 
Mental status: affect, mood, behavioral changes, depression; perform suicide assessment on all patients,
suicidal ideation may occur

 
Opioids; if patient has received, do not administer selegiline, fatal reactions have occurred

Perform/provide:

• 
Assistance with ambulation during beginning therapy

Evaluate:

• 
Therapeutic response: decrease in akathisia, improved mood

Teach patient/family:

• 
To change positions slowly to prevent orthostatic hypotension

• 
Hypertensive crisis:
nausea, vomiting, sweating, agitation, change in mental status, headache, chest pain; to notify prescriber immediately

• 
Serotonin syndrome:
to report twitching, sweating, shivering, diarrhea to prescriber immediately

• 
To use product exactly as prescribed; if discontinued abruptly, parkinsonian crisis may occur

• 
Pregnancy:
to report if pregnancy is planned or suspected, pregnancy (C), avoid breastfeeding

• 
To use during the day to prevent insomnia

• 
To avoid heating pads, hot tubs when using transdermal products

• 
To avoid hazardous activities until response is known

• 
To avoid foods high in tyramine: cheese, pickled products, wine, beer, large amounts of caffeine

 
Not to exceed recommended dose of 10 mg (PO) because this might precipitate hypertensive crisis; to report severe headache, other unusual symptoms

TREATMENT OF OVERDOSE:

IV fluids for hypertension, IV dilute pressure agent for B/P titration

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