Mosby's 2014 Nursing Drug Reference (316 page)

TREATMENT OF ANAPHYLAXIS:

Withdraw product; maintain airway; administer EPINEPHrine, aminophylline, O
2
, IV corticosteroids

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

pentamidine (Rx)

(pen-tam′i-deen)

Nebupent, Pentam 300

Func. class.:
Antiprotozoal

Chem. class.:
Aromatic diamide derivative

ACTION:

Interferes with DNA/RNA synthesis in protozoa

USES:

Treatment/prevention of
Pneumocystis jiroveci
infections

Unlabeled uses:
Leishmania/Trypanosoma
infections

CONTRAINDICATIONS:

Hypersensitivity

Precautions:
Pregnancy (C), breastfeeding, children, blood dyscrasias, cardiac/renal/hepatic disease, diabetes mellitus, hypocalcemia, hypo/hypertension, anemia

DOSAGE AND ROUTES
Calculator

• Adult and child

4 mo:
IV/IM
4 mg/kg/day × 2-3 wk;
NEB
300 mg via specific nebulizer given q4wk for prevention

Available forms:
Inj, aerosol 300 mg/vial; sol for aerosol 60 mg/vial

Administer:
Inhalation route

• 
Through nebulizer, using Raspirgard II jet nebulizer; mix contents in 6 ml of sterile water; do not use low pressure (<20 psi); flow rate should be 5-7 L/min (40-50 psi) air or O
2
source over 30-45 min until chamber is empty

IM route

• 
300 mg diluted in 3 ml sterile water; give deep IM by
Z
-track; if painful by this route, rotate inj site

Intermittent IV INF route

• 
Reconstitute 300 mg/3-5 ml of sterile water for inj, D
5
W, withdraw dose and further dilute in 50-250 ml D
5
W, give over 1-2 hr with patient lying down; check B/P often

Y-site compatibilities:
Alfentanil, atracurium, atropine, benztropine, buprenorphine, calcium gluconate, CARBOplatin, caspofungin, chlorproMAZINE, cimetidine, CISplatin, cyclophosphamide, cycloSPORINE, cytarabine, DACTINomycin, diltiazem, gatifloxacin, zidovudine

SIDE EFFECTS

CNS:
Disorientation, hallucinations,
dizziness
, confusion, drowsiness

CV:
Hypotension, ventricular tachycardia,
QT prolongation, dysrhythmias

GI:
Nausea, vomiting, anorexia;
increased AST, ALT;
acute pancreatitis,
metallic taste

GU:
Acute renal failure, increased serum creatinine, renal toxicity,
decreased urination

HEMA:
Anemia,
leukopenia, thrombocytopenia

INTEG:
Sterile abscess, pain at inj site, pruritus, urticaria,
rash

META:
Hyperkalemia
, hypocalcemia, hypoglycemia, hypomagnesemia

MISC:
Fatigue, fever, chills, night sweats,
anaphylaxis, Stevens-Johnson syndrome

RESP:
Cough, SOB,
bronchospasm
(with aerosol), sore throat

PHARMACOKINETICS

IV:
Peak 1 hr

IM:
Peak 30 min

Excreted unchanged in urine (66%); half-life 9-12 hr (IM), 6 hr (IV)

INTERACTIONS

• 
Nephrotoxicity: aminoglycosides, amphotericin B, CISplatin, NSAIDs, vancomycin

 
Fatal dysrhythmias: erythromycin IV

Increase:
QT prolongation—class IA/III antidysrhythmics, some phenothiazines, β-agonists, local anesthetics, tricyclics, haloperidol, chloroquine, droperidol, pentamidine; CYP3A4 inhibitors (amiodarone, clarithromycin, erythromycin, telithromycin, troleandomycin, arsenic trioxide, levomethadyl); CYP3A4 substrates (methadone, pimozide, QUEtiapine, quiNIDine, risperiDONE, ziprasidone)

Increase:
myelosuppression—antineoplastics, radiation

Drug/Lab Test

Decrease:
WBC, platelets, Hbg, Hct

Increase:
BUN, creatitine

NURSING CONSIDERATIONS
Assess:

• 
Blood tests, blood glucose, CBC, platelets, calcium, magnesium

• 
I&O ratio; report hematuria, oliguria

• 
ECG for cardiac dysrhythmias; patient should be lying down when receiving product; severe hypotension may develop; monitor B/P during administration and until B/P stable

• 
Hepatic studies: AST, ALT

• 
Renal studies: urinalysis, BUN, creatinine; nephrotoxicity may occur; any patient with compromised renal system; product is excreted slowly with poor renal system function; toxicity may occur rapidly

• 
Signs of infection, anemia

• 
Bowel pattern before, during treatment

• 
Sterile abscess, pain at inj site

• 
Respiratory status: rate, character, wheezing, dyspnea

• 
Dizziness, confusion, hallucination

• 
Allergies before treatment, reaction of each medication; place allergies on chart in bright red letters; notify all people giving products

• 
Diabetic patients, hypoglycemia may occur, then hyperglycemia with prolonged therapy

Perform/provide:

• 
Storage in refrigerator protected from light

Evaluate:

• 
Therapeutic response: resolution of AIDS-related PCP

Teach patient/family:

• 
To report sore throat, fever, fatigue (may indicate superinfection)

• 
To maintain adequate fluid intake

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

HIGH ALERT
pentazocine (Rx)

(pen-taz′oh-seen)

Talwin, Talwin NX

Func. class.:
Opiate analgesic, antagonist

Chem. class.:
Synthetic benzomorphan

 

Controlled Substance Schedule IV
ACTION:

Inhibits ascending pain pathways in CNS, increases pain threshold, alters pain perception

USES:

Moderate to severe pain

CONTRAINDICATIONS:

Hypersensitivity to this product or sulfites; addiction (opiate)

Precautions:
Pregnancy (C), breastfeeding, children <18 yr, addictive personality, increased intracranial pressure, MI (acute), severe heart disease, respiratory depression, renal/hepatic disease, seizure disorder, head trauma, bowel impaction, geriatric patients

DOSAGE AND ROUTES
Calculator

• Adult:
IV/IM/SUBCUT
30 mg q3-4hr prn, max 360 mg/day

Labor

• Adult:
IM
30 mg as a single dose;
IV
20 mg q2-3hr when contractions are regular, max 2-3 times

Renal dose

• Adult:
CCr 10-50 ml/min, reduce dose by 25%; CCr <10 ml/min, reduce dose by 50%

Available forms:
Inj 30 mg/ml

Administer:

• 
With antiemetic if nausea, vomiting occur

• 
When pain is beginning to return; determine dosage interval by patient response

IM/SUBCUT route

• 
Give IM deeply into large muscle mass, rotate sites; SUBCUT may cause necrosis with repeated inj

Direct IV route

• 
Undiluted or diluted in 5 mg/ml of sterile water for inj; give ≤5 mg over 1 min

Syringe compatibilities:
Atropine, benzquinamide, butorphanol, chlorproMAZINE, cimetidine, dimenhyDRINATE, diphenhydrAMINE, droperidol, fentaNYL, HYDROmorphone, hydrOXYzine, meperidine, metoclopramide, morphine, perphenazine, prochlorperazine, promazine, promethazine, ranitidine, scopolamine

Y-site compatibilities:
Heparin, hydrocortisone, potassium chloride, vit B/C

SIDE EFFECTS

CNS:
Drowsiness, dizziness, confusion, headache, sedation, euphoria
, hallucinations, dreaming, insomnia, lightheadedness

CV:
Palpitations, bradycardia, change in B/P, tachycardia, increased B/P (high doses), hypotension, syncope, flushing

EENT:
Tinnitus, blurred vision, miosis, diplopia

GI:
Nausea
, vomiting, anorexia, constipation,
cramps
, dry mouth

GU:
Increased urinary output, dysuria, urinary retention

HEMA:
Eosinophilia, decreased WBC

INTEG:
Rash
, urticaria, bruising, flushing, diaphoresis, pruritus, severe irritation at inj sites,
Stevens-Johnson syndrome

RESP:
Respiratory depression

PHARMACOKINETICS

Metabolized by liver, excreted by kidneys, crosses placenta, half-life 2-3 hr, extensive first-pass metabolism with <20% entering circulation

IM/SUBCUT:
Onset 15-30 min, peak 1-2 hr, duration 2-4 hr

IV:
Onset 2-3 min, duration 4-6 hr

INTERACTIONS

 
Unpredictable reactions: MAOIs

Increase:
effects—CNS depressants; alcohol, sedative/hypnotics, antipsychotics, skeletal muscle relaxants

Decrease:
effects—opiates

Drug/Lab Test

Increase:
amylase

NURSING CONSIDERATIONS
Assess:

• 
Pain:
intensity, duration, location prior to and 1 hr after SUBCUT/IM dose or 30 min after IV dose

• 
I&O ratio; check for decreasing output; may indicate urinary retention

• 
Bowel status: constipation; may need stimulant laxatives/stool softeners

• 
Withdrawal symptoms
in opiate-dependent patients

• 
Abscesses, ulcerations, WBC count

• 
CNS changes: dizziness, drowsiness, hallucinations, euphoria, LOC, pupil reaction

• 
Allergic reactions: rash, urticaria

• 
Respiratory depression:
character, rate, rhythm; notify prescriber if respirations are <10/min

• 
Need for pain medication, physical dependence

Perform/provide:

• 
Storage in light-resistant area at room temp

• 
Assistance with ambulation

• 
Safety measures: nightlight, call bell within easy reach

Evaluate:

• 
Therapeutic response: decrease in pain

Teach patient/family:

• 
To report any symptoms of CNS changes, allergic reactions

• 
That physical dependency may result from extended use

• 
That withdrawal symptoms may occur: nausea, vomiting, cramps, fever, faintness, anorexia

• 
To avoid CNS depressants, alcohol

• 
To avoid driving, operating machinery if drowsiness occurs

• 
To use good oral hygiene, frequent rinsing of mouth to decrease dry mouth; to avoid gum, candy if drowsy

TREATMENT OF OVERDOSE:

Naloxone (Narcan) 0.2-0.8 mg IV, O
2
, IV fluids, vasopressors

Other books

Spencerville by Nelson Demille
Empire of Sin by Gary Krist
Promise of Forever by Jessica Wood
The Taker by Alma Katsu
Crusade by Unknown