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Drug Study

CETIRIZINE HCl (Zyrtec)

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Cetirizine HCl (Zyrtec) is an antihistamine used in the management of seasonal allergic rhinitis.

Generic Name

cetirizine hydrochloride

Brand Names

  • Reactine (CAN)
  • Zyrtec

Drug class

  • Antihistamine
  • Pregnancy Category B

Therapeutic actions

Potent histamine (H1) receptor antagonist; inhibits histamine release and eosinophil chemotaxis during inflammation, leading to reduced swelling and decreased inflammatory response

Indications

  • Management of seasonal and perennial allergic rhinitis
  • Treatment of chronic, idiopathic urticaria
  • Treatment of year-round allergic rhinitis and chronic idiopathic urticaria in infants > 6 mo

Contraindications and cautions

  • Contraindicated with allergy to any antihistamines, hydroxyzine.
  • Use cautiously with narrow-angle glaucoma, stenosing peptic ulcer, symptomatic prostatic hypertrophy, asthmatic attack, bladder neck obstruction, pyloroduodenal obstruction (avoid use or use with caution as condition may be exacerbated by drug effects); lactation.

Available forms

Tablets—5, 10 mg; chewable tablets—5, 10 mg; syrup—5 mg/5 mL

Dosages

ADULTS

5–10 mg daily PO; maximum dose 20 mg/day.

PEDIATRIC PATIENTS

6 mo–5 yr: 2.5 mg (one-half teaspoon) PO once daily. In children 1 yr and older, may increase to maximum 5 mg daily given as one-half teaspoon q 12 hr; 2–5 yr—one 5 mg chewable tablet per day.

6–11 yr: 5 or 10 mg daily PO.

> 12 yr: Use adult dosage.

PATIENTS WITH HEPATIC OR RENAL IMPAIRMENT

5 mg PO daily.

Pharmacokinetics

RouteOnsetPeakDuration
OralRapid1 hr24 hr

Metabolism: Hepatic; T1/2: 7–10 hr

Distribution: Crosses placenta; enters breast milk

Excretion: Urine and feces

Adverse effects

  • CNS: Somnolence, sedation
  • CV: Palpitation, edema
  • GI: Nausea, diarrhea, abdominal pain, constipation
  • Respiratory: Bronchospasm, pharyngitis
  • Other: Fever, photosensitivity, rash, myalgia, arthralgia, angioedema

Nursing considerations

Name confusion has occurred between Zyrtec (cetirizine) and Zyprexa (olanzapine);

Assessment

  • History: Allergy to any antihistamines, hydroxyzine; narrow-angle glaucoma, stenosing peptic ulcer, symptomatic prostatic hypertrophy, asthmatic attack, bladder neck obstruction, pyloroduodenal obstruction; lactation
  • Physical: Skin color, lesions, texture; orientation, reflexes, affect; vision examination; R, adventitious sounds; prostate palpation; renal function tests

Interventions

  • Give without regard to meals.
  • Provide syrup form or chewable tablets for pediatric use if needed.
  • Arrange for use of humidifier if thickening of secretions, nasal dryness become bothersome; encourage adequate intake of fluids.
  • Provide skin care for urticaria.

Teaching points

  • Take this drug without regard to meals.
  • You may experience these side effects: Dizziness, sedation, drowsiness (use caution if driving or performing tasks that require alertness); thickening of bronchial secretions, dryness of nasal mucosa (humidifier may help).
  • Report difficulty breathing, hallucinations, tremors, loss of coordination, irregular heartbeat.

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Drug Study

Celecoxib (Celebrex)

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Celecoxib (Celebrex) is a non-opioid analgesic used for the management of acute pain and acute and long-term treatment of signs and symptoms of rheumatoid arthritis and osteoarthritis

Generic Name

celecoxib

(sell ah cocks’ ib)

Brand Name

Celebrex

Drug classes

  • NSAID
  • Analgesic (nonopioid)
  • Specific COX-2 enzyme blocker

Therapeutic actions

Analgesic and anti-inflammatory activities related to inhibition of the COX-2 enzyme, which is activated in inflammation to cause the signs and symptoms associated with inflammation; does not affect the COX-1 enzyme, which protects the lining of the GI tract and has blood clotting and renal functions.

Indications

  • Acute and long-term treatment of signs and symptoms of rheumatoid arthritis and osteoarthritis
  • Reduction of the number of colorectal polyps in familial adenomatous polyposis (FAP)
  • Management of acute pain
  • Treatment of primary dysmenorrhea

Contraindications and cautions

  • Contraindicated with allergies to sulfonamides, celecoxib, NSAIDs, or aspirin; significant renal impairment; pregnancy (third trimester); lactation.
  • Use cautiously with impaired hearing, hepatic, and CV conditions.

Available forms

Capsules—100, 200 mg

Dosages

ADULTS

  • Initially, 100 mg PO bid; may increase to 200 mg/day PO bid as needed.
  • Acute pain, dysmenorrhea: 400 mg, then 200 mg PO bid.
  • FAP: 400 mg PO bid.

PEDIATRIC PATIENTS

Safety and efficacy have not been established.

PATIENTS WITH HEPATIC IMPAIRMENT

Reduce dosage by 50%.

Adverse effects

  • CNS: Headache, dizziness, somnolence, insomnia, fatigue, tiredness, dizziness, tinnitus, ophthamologic effects
  • Dermatologic: Rash, pruritus, sweating, dry mucous membranes, stomatitis
  • GI: Nausea, abdominal pain, dyspepsia, flatulence, GI bleed
  • Hematologic: Neutropenia, eosinophilia, leukopenia, pancytopenia, thrombocytopenia, agranulocytosis, granulocytopenia, aplastic anemia, decreased hemoglobin or hematocrit, bone marrow depression,menorrhagia
  • Other: Peripheral edema, anaphylactoid reactions to anaphylactic shock.
Interactions

Drug-drug

  • Increased risk of bleeding if taken concurrently with warfarin. Monitor patient closely and reduce warfarin dose as appropriate
  • Increased lithium levels and toxicity
  • Increased risk of GI bleeding with long-term alcohol use, smoking

Nursing considerations

Name confusion has occurred between Celebrex (celecoxib), Celexa (citalopram), Xanax (alprazolam), and Cerebyx (fosphenytoin); use caution.

Interventions

  • Administer drug with food or after meals if GI upset occurs.
  • Establish safety measures if CNS, visual disturbances occur.
  • Arrange for periodic ophthalmologic examination during long-term therapy.
  • WARNING: If overdose occurs, institute emergency procedures—gastric lavage, induction of emesis, supportive therapy.
  • Provide further comfort measures to reduce pain (eg, positioning, environmental control), and to reduce inflammation (eg, warmth, positioning, rest).

Patient teaching points

  • Take drug with food or meals if GI upset occurs.
  • Take only the prescribed dosage.
  • You may experience these side effects: Dizziness, drowsiness (avoid driving or the use of dangerous machinery while using this drug).
  • Report sore throat, fever, rash, itching, weight gain, swelling in ankles or fingers; changes in vision.

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Drug Study

Ciprofloxacin (Cipro)

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Ciprofloxacin (Cipro) is a fluoroquinolone used for the treatment of infections caused by susceptible gram-negative bacteria, including E. coli, P. mirabilis, K. pneumoniae, Enterobacter cloacae, P. vulgaris, P. rettgeri, M. morganii, P. aeruginosa,Citrobacter freundii, S. aureus, S. epidermidis, group D streptococci.

Indications

  • For the treatment of infections caused by susceptible gram-negative bacteria, including E. coli, P. mirabilis, K. pneumoniae, Enterobacter cloacae, P. vulgaris, P. rettgeri, M. morganii, P. aeruginosa,Citrobacter freundii, S. aureus, S. epidermidis, group D streptococci
  • Otic: Treatment of acute otitis externa
  • Treatment of chronic bacterial prostatitis
  • IV: Treatment of nosocomial pneumonia caused by Haemophilus influenzae, K. pneumoniae
  • Oral: Typhoid fever
  • Oral: STDs caused by N. gonorrheae

Contraindications and cautions

  • Contraindicated with allergy to ciprofloxacin, norfloxacin or other fluoroquinolones, pregnancy, lactation.
  • Use cautiously with renal dysfunction, seizures, tendinitis or tendon rupture associated with fluoroquinolone use

Dosages

ADULTS

  • Uncomplicated UTIs: 100–250 mg PO q 12 hr for 3 days or 500 mg PO daily (ER tablets) for 3 days.
  • Mild to moderate UTIs: 250 mg PO q 12 hr for 7–14 days or 200 mg IV q 12 hr for 7–14 days.
  • Complicated UTIs: 500 mg bid PO q 12 hr for 7–14 days or 400 mg IV q 12 hr or 1,000 mg (ER tablets) PO daily for 7–14 days.
  • Chronic bacterial prostatitis: 500 mg PO q 12 hr for 28 days or 400 mg IV q 12 hr for 28 days.
  • Infectious diarrhea: 500 mg q 12 hr PO for 5–7 days.
  • Anthrax postexposure: 500 mg PO q 12 hr for 60 days or 400 mg IV q 12 hr for 60 days.
  • Respiratory infections 500–750 mg PO or 400 mg IV q 12 hr for 7–14 days.
  • Acute sinusitis: 500 mg PO q 12 hr or 400 mg IV q 12 hr for 10 days.
  • Acute uncomplicated pyelonephritis: 1,000 mg ER tablets PO daily for 7–14 days.
  • Bone, joint, skin infections: 500–750 mg PO or 400 mg IV q 12 hr for 4–6 wk.
  • Nosocomial pneumonia: 400 mg IV q 8 hr.
  • Ophthalmic infections caused by susceptible organisms not responsive to other therapy: 1 or 2 drops per eye daily or bid or 1/2-inch ribbon of ointment into conjunctival sac tid on first 2 days, then apply 1/2-inch ribbon bid for next 5 days.
  • Acute otitis externa: 4 drops in infected ear, tid–qid.

Adverse effects

  • CNS: Headache, dizziness, insomnia, fatigue, somnolence, depression, blurred vision
  • CV: Arrhythmias, hypotension, angina
  • EENT: Dry eye, eye pain, keratopathy
  • GI: Nausea, vomiting, dry mouth, diarrhea, abdominal pain
  • HematologicElevated BUN, AST, ALT, serum creatinine and alkaline phosphatase; decreased WBC, neutrophil count, Hct
  • Other: Fever, rash

Nursing Assessment

  • History: Allergy to ciprofloxacin, norfloxacin or other quinolones; renal dysfunction; seizures; lactation
  • Physical: Skin color, lesions; orientation, reflexes, affect; mucous membranes, bowel sounds; renal and liver function tests

Nursing Interventions

  • Arrange for culture and sensitivity tests before beginning therapy.
  • Continue therapy for 2 days after signs and symptoms of infection are gone.
  • Ensure that patient is well hydrated.
  • Give antacids at least 2 hrs after dosing.
  • Monitor clinical response; if no improvement is seen or a relapse occurs, repeat culture and sensitivity.
  • Encourage patient to complete full course of therapy.

Patient Education

  • Educate patient not to touch tip of eye ointment or solution for this may contaminate the product.
  • Encourage patient to drink plenty of fluids while taking this drug.
  • Educate patient on these side effects: Nausea, vomiting, abdominal pain (eat frequent small meals); diarrhoea or constipation; drowsiness, blurring of vision, dizziness (observe caution when driving or using dangerous equipment).
  • Encourage patient to report rash, visual changes, severe GI problems, weakness, tremors.


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Drug Study

Aluminum Hydroxide (Amphogel)

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Generic Name: aluminum hydroxide

Brand Name: Alu-Cap, Alugel, Alu-Tab, Amphogel, Dialume

Classifications: gastrointestinal agent; antacid; adsorbent

Actions

Nonsystemic antacid with moderate neutralizing action. Decreases rate of gastric emptying and has demulcent, adsorbent, and mild astringent properties. Reduces acid concentration and pepsin activity by raising pH of gastric and intraesophageal secretions.

Therapeutic Effects

Reduces gastric acidity by neutralizing the stomach acid content. Aluminum hydroxide lowers serum phosphate by binding dietary phosphate to form insoluble aluminum phosphate, which is excreted in feces.

Uses

Symptomatic relief of gastric hyperacidity associated with gastritis, esophageal reflux, and hiatal hernia; adjunct in treatment of gastric and duodenal ulcer. More commonly used in combination with other antacids. Aluminum hydroxide is used primarily in conjunction with a low phosphate diet to reduce hyperphosphatemia in patients with renal insufficiency and for prophylaxis and treatment of phosphatic renal calculi.

Cautious Use

Renal impairment; gastric outlet obstruction; older adults; decreased bowel activity (e.g., patients receiving anticholinergic, antidiarrheal, or antispasmodic agents); patients who are dehydrated or on fluid restriction.

Dosage

Adult: PO 600 mg t.i.d. or q.i.d.

Administration

Oral

  • Tablet must be chewed until it is thoroughly wetted before swallowing.
  • Note for antacid use: Follow well-chewed tablet with one-half glass of water or milk; follow liquid preparation (suspension) with water to ensure passage into stomach. For phosphate lowering: follow tablet, capsule, or suspension with full glass of water or fruit juice.
  • Store between 15°–30° C in tightly closed container.

Adverse Effects

GI: Constipation, fecal impaction, intestinal obstruction.

Interactions

Drug: Aluminum will decrease absorption of chloroquine, cimetidine, ciprofloxacin, digoxin, isoniazid, iron salts, NSAIDs, norfloxacin, ofloxacin, phenytoin, phenothiazines, quinidine, tetracycline, thyroxine. Sodium polystyrene sulfonate may cause systemic alkalosis.

Nursing Considerations

Assessment & Drug Effects

  • Note number and consistency of stools. Constipation is common and dose related. Intestinal obstruction from fecal concretions has to be reported.
  • Lab tests: Monitor periodic serum calcium and phosphorus levels with prolonged high-dose therapy or impaired renal function.

Patient & Family Education

  • Increase phosphorus in diet when taking large doses of these antacids for prolonged periods; hypophosphatemia can develop within 2 wk of continuous use of these antacids. The older adult in a poor nutritional state is at high risk.
  • Antacid may cause stools to appear speckled or whitish.
  • Report epigastric or abdominal pain; it is a clinical guide for adjusting dosage. Keep physician informed. Pain that persists beyond 72 h may signify serious complications.
  • Seek medical help if indigestion is accompanied by shortness of breath, sweating, or chest pain, if stools are dark or tarry, or if symptoms are recurrent when taking this medication.
  • Seek medical advice and supervision if self-prescribed antacid use exceeds 2 weeks

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