Mosby's 2014 Nursing Drug Reference (140 page)

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

dorzolamide
(ophthalmic)

(dor-zole′ah-mide)

Trusopt

Func. class.:
Antiglaucoma

Chem. class.:
Carbonic anhydrase inhibitor

ACTION:

Decreases aqueous humor secretion by decreasing bicarbonate, thus decreasing IOP

USES:

For the treatment of elevated intraocular pressure in patients with ocular hypertension or open-angle glaucoma

CONTRAINDICATIONS:

Hypersensitivity

Precautions:
Hypersensitivity to sulfonamides, hepatic/renal disease, angle-closure glaucoma, electrolyte disturbances

DOSAGE AND ROUTES
Calculator
Elevated intraocular pressure in patients with ocular hypertension or open-angle glaucoma

• Adult/adolescent/child/infant/neonate ≥1 wk: Ophthalmic
Instill 1 drop of a 2% solution into the affected eye(s) tid

Available forms:
Ophthalmic solution 2%

Administer:

• 
Wash hands before and after use, tilt the head back slightly and pull the lower eyelid down with the index finger to form a pouch, squeeze the prescribed number of drops into the pouch and gently close eyes for 1–2 min. Do not blink

• 
Care should be taken to avoid contamination, do not touch the tip of the dropper to the eye, fingertips, or other surface

• 
The sol may be used concomitantly with other topical ophthalmic drug products to lower IOP. If more than one topical ophthalmic drug is being used, administer ≥10 min apart

SIDE EFFECTS

CNS:
Headache

EENT:
Blurred vision, tearing, allergy, burning/stinging, photophobia

GI:
Bitter taste

PHARMACOKINETICS

Onset 1-2 hr, peak 3 hr, duration 8 hr, half-life 4 mo

INTERACTIONS

Increase:
effects—carbonic anhydrase inhibitors (PO), salicylates

NURSING CONSIDERATIONS
Assess:

• 
Hypersensitivity

• 
Monitor IOP during treatment

Evaluate:

• 
Decreasing IOP

Teach patient/family:

• 
How to use product

• 
Not to share with others or use for other conditions


 
To notify prescriber immediately if vision changes or if condition worsens

• 
To take as prescribed

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

doxapram (Rx)

(dox′a-pram)

Dopram

Func. class.:
Analeptic

ACTION:

Respiratory stimulation through activation of peripheral carotid
chemoreceptor; with higher doses, medullary respiratory centers are stimulated; with progressive CNS stimulation

USES:

Chronic obstructive pulmonary disease (COPD), postanesthesia respiratory depression, prevention of acute hypercapnia, product-induced CNS depression

Unlabeled uses:
Neonatal apnea

CONTRAINDICATIONS:

Hypersensitivity, seizure disorders, severe hypertension, severe bronchial asthma, severe dyspnea, severe cardiac disorders, flail chest, pneumothorax, PE, severe respiratory disease

Precautions:
Pregnancy (B), breast-feeding, children, bronchial asthma, pheochromocytoma, severe tachycardia, dysrhythmias, hypertension, hyperthyroidism

DOSAGE AND ROUTES
Calculator
Postanesthesia


Adult: IV
inj 0.5-1 mg/kg, not to exceed 1.5 mg/kg total as a single inj;
IV INF
250 mg in 250 ml sol, not to exceed 4 mg/kg; run at 1-3 mg/min

Drug-induced CNS depression


Adult: IV
Priming dose of 2 mg/kg, repeated in 5 min; repeat q1-2hr until patient awakes;
IV INF
priming dose 2 mg/kg at 1-3 mg/min, not to exceed 3 g/day

COPD (hypercapnia)

• 
Adult: IV INF
1-2 mg/min, not to exceed 3 mg/min for no longer than 2 hr

Available forms:
Inj 20 mg/ml

SIDE EFFECTS

CNS:
Seizures (clonus/generalized),
headache
, restlessness, dizziness, confusion, paresthesias, flushing, sweating, bilateral Babinski’s sign, rigidity, depression

CV:
Chest pain, hypertension, change in heart rate
, lowered T waves, tachycardia,
dysrhythmias

EENT:
Pupil dilation, sneezing

GI:
Nausea, vomiting, diarrhea, desire to defecate

GU:
Retention, incontinence, elevation of BUN, albuminuria

INTEG:
Pruritus, irritation at inj site

RESP:
Laryngospasm, bronchospasm,
rebound hypoventilation, dyspnea, cough, tachypnea, hiccups

PHARMACOKINETICS

IV:
Onset 20-40 sec, peak 1-2 min, duration 5-10 min, metabolized by liver, excreted by kidneys (metabolites), half-life 2.5-4 hr

INTERACTIONS


 
Synergistic pressor effect: MAOIs, sympathomimetics


 
Cardiac dysrhythmias: halothane, cyclopropane, enflurane; delay use of doxapram for at least 10 min after inhalation anesthetics

NURSING CONSIDERATIONS
Assess:

• 
BP, heart rate, deep tendon reflexes, ABGs, LOC before administration, q30min

• 
P
O
2
, P
CO
2
, O
2
saturation during treatment


 
Hypertension, dysrhythmias, tachycardia, dyspnea, skeletal muscle hyperactivity; may indicate overdosage; discontinue product

• 
Respiratory stimulation: increased rate, abnormal rhythm

• 
Extravasation; change IV site q48hr

• 
Patient closely for ½-1 hr

Administer:
IV route

• 
Undiluted or diluted with equal parts of sterile water for inj; may be diluted 250 mg/250 ml of D
5
W, D
10
W and run as inf; rapid inf may cause hemolysis

• 
IV undiluted over 5 min; IV inf at 1-3 mg/min; adjust for desired respiratory response, using inf pump IV; if an inf is
used after initial dose, start at 1-3 mg/min depending on patient response; D/C after 2 hr; wait 1-2 hr and repeat

• 
Only after adequate airway is established

• 
After O
2
, IV barbiturates, resuscitative equipment available

Syringe compatibilities:
Amikacin, bumetadine, chlorproMAZINE, cimetidine, CISplatin, cyclophosphamide, DOPamine, doxycycline, EPINEPHrine, hydrOXYzine, imipramine, isoniazid, lincomycin, methotrexate, netilmicin, phytonadione, pyridoxine, terbutaline, thiamine, tobramycin, vinCRIStine

Perform/provide:

• 
Placing patient in Sims’ position to prevent aspiration of vomitus

• 
Discontinue infusion if side effects occur; narrow margin of safety

Evaluate:

• 
Therapeutic response: increased breathing capacity

Teach patient/family:

• 
Purpose of medication

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

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