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- 1. Pharmacology for Nurses
A Pathophysiologic Approach
Third Edition
CHAPTER 34
Drugs for Bacterial
Infection
Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 2. Pathogens
• Organisms that can cause disease
• Must bypass the body’s defenses
– Bacteria, viruses
– Fungi; intracellular organisms
– Multicellular animals
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- 3. Pathogens (continued)
• Cause disease in two ways
– Invasiveness: divide rapidly to overcome and
cause direct damage
– Toxins: very small amounts disrupt normal
cell function
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- 4. Pathogenicity and Virulence
• Pathogenicity: ability of organism to cause
infection
• Virulence: ability of a microbe to produce
disease when present in minute numbers
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- 5. Methods of Describing Bacteria
• Basic Shapes
– Bacilli- rod shape
– Cocci-spherical
– Spirilla-spiral shape
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- 6. Methods of Describing Bacteria
(continued)
• Ability to use oxygen
– Aerobic- with O2
– Anaerobic- without O2
• Staining Characteristics
– Gram positive
– Gram negative
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- 7. Anti-infective Drugs
• Known as antibacterial, antimicrobial,
antibiotic
• Classified by
– Chemical structures (e.g., aminoglycoside,
Fluoroquinolone)
– Mechanism of action (e.g., cell-wall inhibitor,
folic-acid inhibitor)
– See Table 34.1, Bacterial Pathogens and
Disorders
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- 8. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 9. Action of Anti-infective Drugs
• Affect target organism’s structure,
metabolism, or life cycle
• Goal is to eliminate pathogen
– Bactericidal – kill bacteria
– Bacteriostatic – slow growth of bacteria
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- 10. Figure 34.1 Mechanisms of action of antimicrobial drugs
Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 11. Acquired Resistance
• Occurs when pathogen acquires gene for
bacterial resistance
– Through maturation
Antibiotics destroy sensitive bacteria
Insensitive (mutated) bacteria remain
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- 12. Acquired Resistance (continued)
• Mutation random, occur during cell
division
• Mutated bacteria multiply
• Antibiotics do not create mutations
• By another microbe
– Bacteria passed to others
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- 13. Widespread Use of antibiotics
• Resistance not caused by but is worsened
by overprescription of antibiotics
– Results in loss of antibiotic effectiveness
• Only prescribe when necessary
• Long-time use increases resistant strains
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- 14. Widespread Use of antibiotics
(continued)
• Nosocomial infections often resistant
• Prophylactic use sometimes appropriate
• Nurse should instruct client to take full
dose
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- 15. Figure 34.2 Acquired resistance
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- 16. Role of the Nurse
• Monitor client’s condition
• Provide client education
• Obtain medical, surgical, and drug history
• Assess lifestyle and dietary habits
• Obtain description of symptomology and
current therapies
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- 17. Role of the Nurse (continued)
• Obtain specimens for culture and
sensitivity prior to start of therapy
• Monitor for indication of response to
therapy
– Reduced fever
– Normal white blood count
– Improved appetite
– Absence of symptoms such as cough
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- 18. Role of the Nurse (continued)
• After parenteral administration, observe
closely for possible allergic reactions
• Monitor for superinfections
– Replace natural colon flora with probiotic
supplements or cultured diary products
Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 19. Role of the Nurse (continued)
• Teach clients to
– Wear medic-alert bracelets if allergic to
antibiotics
– Report symptoms of allergic reaction
– Not stop taking drug until complete
prescription has been taken
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- 20. Drug Therapy with Penicillin
• Assess previous drug reactions to
penicillin
• Avoid cephalosporins if client has history
of severe penicillin allergy
• Monitor for hyperkalemia and
hypernatremia
• Monitor cardiac status, including ECG
changes
Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 23. Cephalosporin Therapy
• Assess for presence or history of bleeding
disorders
– Cephalosporins may reduce prothrombin
levels
• Assess renal and hepatic function
• Avoid alcohol
– Some cephalosporins cause disulfiram
(Antabuse)-like reaction with alcohol
Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 24. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 25. Tetracycline Therapy
• Contraindicated for clients who are
pregnant or lactating
– Effect on linear skeletal growth of fetus and
child
• Contraindicated in children less than 8
years of age
– Permanent mottling and discoloration of teeth
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- 26. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 27. Tetracycline Therapy (continued)
• Tetracycline decrease effectiveness of
oral contraceptives
– Alternate birth-control method should be used
while taking medication
• Use caution in clients with impaired kidney
or liver function
Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 28. Tetracycline Therapy (continued)
• Photosensitivity may result
• Do not take with milk products, iron
supplements, magnesium-containing
laxatives, or antacids
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- 29. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 30. Macrolide Therapy
• Assess presence of respiratory infection
• Examine client for history of cardiac
disorders
• Monitor hepatic enzymes with certain
macrolides, such as erythromycin estolate
• Multiple-drug-drug interactions occur with
macrolides
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- 31. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 32. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 33. Aminoglycoside Therapy
• Monitor for ototoxicity and nephrotoxicity
• Hearing loss may occur after therapy has
been completed
• Neuromuscular function may also be
impaired
• Increase fluid intake, unless otherwise
contraindicated, to promote excretion
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- 34. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 35. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 36. Fluoroquinolone Therapy
• Monitor white blood count
• Monitor client with liver and renal
dysfunction
• Teach that drugs may cause dizziness
and lightheadedness
– Advise against driving or performing
hazardous tasks during drug therapy
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- 37. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 38. Fluoroquinolone Therapy
(continued)
• Norfloxacin (Noroxin) may cause
photophobia
• Teach that drug may affect tendons,
especially in children
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- 39. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 40. Sulfonamide Therapy
• Assess for anemia or other hematological
disorders
• Assess renal function; sulfonamides may
increase risk of crystalluria
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- 41. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 42. Sulfonamide Therapy (continued)
• Contraindicated in clients with history of
hypersensitivity to sulfonamides
– Can induce skin abnormality called Stevens-
Johnson syndrome
• Teach clients how to decrease effects of
photosensitivity
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- 43. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 44. Selection of an Antibiotic
• Careful selection of correct antibiotic –
essential
– Use of culture and sensitivity testing
– For effective pharmacotherapy; to limit
adverse effects
Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 45. Selection of an Antibiotic
(continued)
• Broad spectrum antibiotics
– Effective for a wide variety of bacteria
• Narrow spectrum antibiotics
– Effective for narrow group of bacteria
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- 46. Culture and Sensitivity Testing
• Examination of specimen for
microorganisms
• Grown in Lab and identified
• Tested for sensitivity to different antibiotics
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- 47. Culture and Sensitivity Testing
(continued)
• Bacteria may take several days to identify
• Viruses may take several weeks to identify
• Broad spectrum antibiotics may be started
before lab culture completed
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- 48. Multidrug Therapy
• Affected by antagonism-combining two
drugs may decrease efficacy of each
• Use of multiple antibiotics increases risk of
resistance
• Multidrug therapy can be used
– When multi-organisms cause infection
– For treatment of tuberculosis
– For treatment of HIV
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- 49. Superinfections
• Secondary infections that occur when too
many host flora are killed by an antibiotic
– Host flora prevent growth of pathogenic
organisms
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- 50. Superinfections (continued)
• Pathogenic microorganisms have chance
to multiply
– Opportunistic- take advantage of suppressed
immune system
– Signs and symptoms include diarrhea,
bladder pain, painful urination, or abnormal
vaginal discharge
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- 51. Host Factors Influence Choice of
Antibiotics
• Host Factors Influence Choice of
Antibiotics
• Immune system status
• Local condition at infection site
• Allergic reactions
• Age
• Pregnancy
• Genetics
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- 52. Penicillin
• Prototype drug: penicillin G (Pentids)
• Mechanism of action: to kill bacteria by
disrupting their cell walls
• Primary use: as a drug of choice against
streptococci, pneumococci, and
staphylococci organisms that do not
produce penicillinase
– Also medication of choice for gonorrhea and
syphilis
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- 53. Penicillin (continued)
• Adverse effects: diarrhea, nausea,
vomiting, superinfections, anaphylaxis
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- 54. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 55. Cephalosporins
• Prototype drug: cefotaxime (Claforan)
• Mechanism of action: to act with broad
spectrum activity against gram-negative
organisms
• Primary use: for serious infections of lower
respiratory tract, central nervous system,
genitourinary system, bones, blood and
joints
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- 56. Cephalosporins (continued)
• Adverse effects: hypersensitivity,
anaphylaxis diarrhea, vomiting, nausea,
pain at injection site
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- 57. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 58. Tetracycline
• Prototype drug: tetracycline HCL
(Achromycin, others)
• Mechanism of action: effective against
broad range of gram-positive and gram-
negative organisms
• Primary use: clamydiae, rickettsiae, and
mycoplasma
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- 59. Tetracycline (continued)
• Adverse effects: superinfections, nausea,
vomiting, diarrhea, discoloration of teeth,
photosensitivity
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- 60. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 61. Macrolide
• Prototype drug: erythromycin (E-Mycin,
Erythrocin)
• Mechanism of action: to act as spectrum
similar to that of penicillins
– Also effective against gram-positive bacteria
• Primary use: for Bordetella pertusis
(whooping cough) and Corynebacterium
diphtheriae, most gram-positive bacteria
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- 62. Macrolide (continued)
• Adverse effects: nausea, abdominal
cramping and vomiting, diarrhea
– Most severe is hepatotoxicity
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- 63. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 64. Aminoglycoside
• Prototype drug: gentamycin
(Garamycin)
• Mechanism of action: to act as broad-
spectrum, bacteriocidal antibiotic
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- 65. Macrolide
• Primary use: for serious urinary,
respiratory, nervous, or GI infections
– Often used in combination with other
antibiotics
– Used parenterally or as drops (Genoptic) for
eye infections
• Adverse effects: ototoxiciy, and
nephrotoxicity
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- 66. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 67. Fluoroquinolone
• Prototype drug: ciprofloxacin (Cipro)
• Mechanism of action: to inhibit bacterial
DNA gyrase
– Affects bacterial replication and DNA repair
• Primary use: for respiratory infections,
bone and joint infections, GI infections,
ophthalmic infections, sinusitis, and
prostatitis
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- 68. Fluoroquinolone (continued)
• Adverse effects: nausea, vomiting,
diarrhea, phototoxicity, headache,
dizziness
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- 69. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 70. Sulfonamide
• Prototype drug: trimethoprim-
sulfamethoxazole (Bactrim, Septra)
• Mechanism of action: to kill bacteria by
inhibiting bacterial metabolism of folic acid
• Primary use: for urinary tract infections,
Pneumocystis carinii pneumonia, shigella
infections of small bowel, and acute
episodes of chronic bronchitis
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- 71. Sulfonamide (continued)
• Adverse effects: skin rashes, nausea,
vomiting, agranulocytosis or
thrombocytopenia
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- 72. Pharmacology for Nurses: A Pathophysiologic Approach, Third Edition Copyright ©2011 by Pearson Education, Inc.
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- 73. Miscellaneous
• Clindamycin (Cleocin): for oral infections
caused by bacteroides
– Associated with pseudomembraneous colitis
– Metronidazole (Flagyl) used to treat H. Pylori
infections of stomach
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- 74. Miscellaneous (continued)
• Vancomycin (Vancocin) effective for
MRSA infections
– Adverse effects: ototoxicity, nephrotoxicity,
red man syndrome
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- 75. Miscellaneous - new
• Oxazolidinones: linezolid (Zyvox) – as
effective as vancomycin against MRSA
• Cyclic lipopeptides: daptomycin (Cubicin)-
used to treat serious skin infections
• Carbapenems: imipenem (Primaxin) have
some of the broadest spectrums
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- 76. Miscellaneous – new (continued)
• Ketolides: telithromycin (Ketek) –used for
respiratory infections
• Glycylcyclines: tigecycline (Tygacil) used
for drug-resistant abdominal infections
and complicated skin infections
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- 77. Patients Receiving Antibacterial
Therapy
• Assessment
– Obtain complete health history—allergies,
drugs, drug interactions
– Obtain specimens for culture and sensitivity
before initiating therapy
– Perform infection-focused physical
examination—vital signs, WBC count,
sedimentation rate
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- 78. Patients Receiving Antibacterial
Therapy (continued)
• Nursing diagnoses
– Pain (related to infection)
– Infection
– Hyperthermia
– Risk for Injury (related to adverse drug
effects)
– Deficient knowledge, related to drug therapy
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- 79. Patients Receiving Antibacterial
Therapy (continued)
• Nursing diagnoses
– Risk for Deficient Fluid Volume (related to
fever, diarrhea caused by adverse drug
effects)
– Risk for Noncompliance (related to adverse
drug effects, deficient knowledge, or cost of
medication)
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- 80. Patients Receiving Antibacterial
Therapyn (continued)
• Planning—patient will
– Report diminished signs and symptoms of
infection, decreased fever and fatigue,
increased appetite)
– Be free from, or experiences minimal adverse
effects
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- 81. Patients Receiving Antibacterial
Therapyn (continued)
• Planning—patient will
– Verbalize an understanding of the drug’s use,
adverse effects and required precautions.
– Demonstrate proper self-administration of the
medication (e.g., dose, timing, when to notify
provider)
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- 82. Patients Receiving Antibacterial
Therapy (continued)
• Implementation
– Monitor vital signs and symptoms of infection
– Monitor for hypersensitivity reaction
– Monitor for severe diarrhea
– Administer drug around the clock
– Monitor for superinfection
– Monitor intake of OTC products
– Monitor for photosensitivity
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- 83. Patients Receiving Antibacterial
Therapy (continued)
• Implementation
– Determine food and beverage interactions
– Monitor IV site for signs of tissue irritation,
severe pain, extravasation
– Monitor for side effects, renal function,
symptoms of ototoxicity, compliance with
antibiotic therapy
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- 84. Patients Receiving Antibacterial
Therapy (continued)
• Evaluation—patient
– Reports diminished signs and symptoms of
infection, decreased fever
– Is free from, or experiences minimal adverse
effects.
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- 85. Patients Receiving Antibacterial
Therapy (continued)
• Evaluation—patient
– Verbalizes an understanding of the drug’s
use, adverse effects and required
precautions.
– Demonstrates proper self-administration of
the medication (e.g., dose, timing, when to
notify provider).
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