Mosby's 2014 Nursing Drug Reference (103 page)

Canada only   Side effects:
italics
= common;
bold
= life-threatening   
Nurse Alert

cloNIDine (Rx)

(klon′i-deen)

Catapres, Catapres-TTS, Duraclon, Kapvay, Nexiclon

Func. class.:
Antihypertensive

Chem. class.:
Central α-adrenergic agonist

Do not confuse:
cloNIDine
/KlonoPIN/clonazePAM
Catapres
/Cataflam/Catarase

ACTION:

Inhibits sympathetic vasomotor center in CNS, which reduces impulses in sympathetic nervous system; blood pressure, pulse rate, cardiac output decrease, prevents pain signal transmission in CNS by α-adrenergic receptor stimulation of the spinal cord

USES:

Mild to moderate hypertension, used alone or in combination; severe pain in cancer patients (epidural)

Unlabeled uses:
Opioid withdrawal, prevention of vascular headaches, treatment of menopausal symptoms, dysmenorrhea, attention-deficit/hyperactivity disorder (ADHD), autism, cycloSPORINE nephrotoxicity prophylaxis, diabetic neuropathy, ethanol withdrawal, Tourette’s syndrome, hypertensive emergency

CONTRAINDICATIONS:

Hypersensitivity; (epidural) bleeding disorders, anticoagulants

Precautions:
Pregnancy (C), breastfeeding, children <12 yr (transdermal), geriatric patients, noncompliant patients, MI (recent), diabetes mellitus, chronic renal failure, Raynaud’s disease, thyroid disease, depression, COPD, asthma, pheochromocytoma

 

Black Box Warning:

Labor

DOSAGE AND ROUTES
Calculator
Hypertension

• Adult:
PO/TRANSDERMAL
0.1 mg bid then increase by 0.1-0.2 mg/day at weekly intervals until desired response; range 0.2-0.6 mg/day in divided doses

• Geriatric:
PO
0.1 mg at bedtime, may increase gradually

• Child:
PO
5-10 mcg/kg/day in divided doses q8-12hr, max 0.9 mg/day

Severe pain

• Adult:
CONT EPIDURAL INF
30 mcg/hr

• Child:
CONT EPIDURAL INF
0.5 mcg/kg/hr then titrate to response

Opioid withdrawal (unlabeled)

• Adult:
PO
0.3-1.2 mg/day; may decrease by 50% × 3 days then decrease by 0.1-0.2 mg/day or discontinue

ADHD

• Adolescent/child ≥6 yr:
PO
0.05 mg/kg/day in 3-4 divided doses × 8 wk, max 0.4 mg/day (unlabeled); ext rel 0.1 mg at bedtime, increase dose by 0.1 mg/day up to 0.4 mg/day

Menopausal symptoms (unlabeled)

• Adult:
TRANSDERMAL
0.1-mg patch q1wk;
PO
0.05-0.4 mg/day

Tourette’s syndrome (unlabeled)

• Adult:
PO
0.15-0.2 mg/day

Hypertensive emergency (unlabeled)

• Adult:
PO
0.1-0.2 mg q1hr to a total of 0.6 mg

Available forms:
Tabs 0.025
, 0.1, 0.2, 0.3 mg; transdermal 2.5, 5, 7.5 mg delivering 0.1, 0.2, 0.3 mg/24 hr, respectively; inj 100, 500 mcg/ml; ext rel tab 0.1 mg (Kapvay), 0.17 mg (Nexiclon)

Administer:

• 
Store patches in cool environment, tablets in tight container

PO route

• 
Give last dose at bedtime

• 
Do not crush, cut, chew, or break ext rel tabs

Transdermal route

• 
Once weekly; apply to site without hair; best absorption over chest or upper arm; rotate sites with each application; clean site before application; apply firmly, especially around edges

Epidural route

• 
Used for severe cancer pain

• 
May be used with opiates

• 
Use only if familiar with epidural inf devices

SIDE EFFECTS

CNS:
Drowsiness, sedation, headache, fatigue
, nightmares, insomnia, mental changes, anxiety, depression, hallucinations, delirium

CV:
Orthostatic hypotension, palpitations
,
CHF,
ECG abnormalities, sinus tachycardia

EENT:
Taste change, parotid pain

ENDO:
Hyperglycemia

GI:
Nausea, vomiting, malaise
, constipation,
dry mouth

GU:
Impotence, dysuria, nocturia, gynecomastia

INTEG:
Rash
, alopecia, facial pallor, pruritus, hives, edema, burning papules, excoriation (transdermal patches)

MISC:
Withdrawal symptoms

MS:
Muscle, joint pain; leg cramps

PHARMACOKINETICS

Absorbed well

PO:
Onset 1/2 to 1 hr, peak 2-4 hr, duration 8-12 hr, half-life 6-12 hr

TRANSDERMAL:
Onset 3 days; duration 1 wk; metabolized by liver (metabolites); excreted in urine (30% unchanged, inactive metabolites), feces; crosses blood-brain barrier; excreted in breast milk

INTERACTIONS

• 
AV block: verapamil

 
Life-threatening elevations of B/P: tricyclics,
β
-blockers

Increase:
CNS depression—opiates, sedatives, hypnotics, anesthetics, alcohol

Increase:
hypotensive effects—diuretics, other antihypertensive nitrates

Decrease:
hypotensive effects—tricyclics, MAOIs, appetite suppressants, amphetamines, prazosin, antipsychotics

Decrease:
effect of levodopa

Drug/Herb

Increase:
antihypertensive effect—hawthorn

Decrease:
antihypertensive effect—ephedra, ginseng

Drug/Lab Test

Increase:
blood glucose

Decrease:
VMA, urinary catecholamines, aldosterone

NURSING CONSIDERATIONS
Assess:

• 
Hypertension:
B/P, pulse; report significant changes

• 
Opiate withdrawal (unlabeled):
fever, diarrhea, nausea, vomiting, cramps, insomnia, shivering, dilated pupils

• 
Cancer pain:
location, intensity, character; alleviating, aggravating factors at baseline and frequently

• 
Edema in feet, legs daily; monitor I&O; check for falling output

• 
Allergic reaction:
rash, fever, pruritus, urticaria; product should be discontinued if antihistamines fail to help

• 
CHF:
edema, dyspnea, wet crackles, B/P, more common in geriatric patients

• 
Renal symptoms: polyuria, oliguria, frequency

Evaluate:

• 
Therapeutic response: decrease in B/P with hypertension, decrease in withdrawal symptoms (opioid), decrease in pain

Teach patient/family:

• 
To avoid hazardous activities, since product may cause drowsiness

• 
To notify all health care providers of medication use

• 
Not to discontinue product abruptly or
withdrawal symptoms
may occur: anxiety, increased B/P, headache, insomnia, increased pulse, tremors, nausea, sweating; to comply with dosage schedule even if feeling better

• 
Not to use OTC (cough, cold, or allergy) products unless directed by prescriber

• 
To rise slowly to sitting or standing position to minimize orthostatic hypotension, especially among geriatric patients

• 
To notify prescriber of mouth sores, sore throat, fever, swelling of hands or feet, irregular heartbeat, chest pain, signs of
angioedema

• 
About excessive perspiration, dehydration, vomiting; diarrhea may lead to fall in B/P; consult prescriber if these occur; that product may cause dizziness, fainting; that lightheadedness may occur during first few days of therapy

• 
That product may cause dry mouth; to use hard candy, saliva product, sugarless gum, or frequent rinsing of mouth

• 
That compliance is necessary; not to skip or stop product unless directed by prescriber; tolerance may develop with long-term use

• 
Transdermal:
How to use patch; that patch comes in two parts: product patch and overlay to keep patch in place; not to trim or cut patch; that response may take 2-3 days if product is given transdermally; on administration of patch, if switching from tabs to patch, to taper tabs to avoid withdrawal

TREATMENT OF OVERDOSE:

Supportive treatment; administer tolazoline, atropine, DOPamine prn

Canada only   Side effects:
italics
= common;
bold
= life-threatening   
Nurse Alert

Other books

Imaginary Toys by Julian Mitchell
Follow Me by Joanna Scott
A Prison Unsought by Sherwood Smith, Dave Trowbridge
Claudia and the New Girl by Ann M. Martin
Saving Molly by Lana Jane Caldwell
Star Toter by Al Cody
Ruins by Joshua Winning
Field of Mars by Stephen Miller