Real Final Flashcards
(321 cards)
antimicrobial agent (AMA)
substance that kills or inhibits the growth of microorganisms such as bacteria, fungi, or protozoans
antibiotic agent
an antibacterial agent kills or inhibits the growth of bacteria
choosing antibiotics
are chosen based on type of bacteria, not strength
find the right drug not the strongest
will be able to tell if it is the “right antibiotic” within 24 hours -> people will start to look better, and WBC should be going down
ceph___ or cepf___
cephalosporins
___cillins
penicillins
actions of abx drugs *
- affect target organism’s structure, metabolism, or life cycle
- goal is to eliminate the pathogen -> bactericidal = kill bacteria, bacteriostatic = slow growth of bacteria
- may be used for prophylactic treatment of people with suppressed of compromised immune systems
important abx considerations*
- make sure pt knows to finish all abx -> if not followed, can lead to the development of drug-resistant bacteria
- do not share
- keep away from children (safety lid and lock)
- educate pt that abx will decrease oral contraceptive pills and hormonal IUD -> use a back up birth control
- teach when to take with food or when to avoid certain foods
- teach clients to wear medic-alert bracelets if allergic
- inform about side effects -> skin, teeth, tendons, ears, kidneys -> assess for renal and hepatic function (especially in elderly) = 2.2lb or 1kg per day of weight gain
- assess for persistent diarrhea in children
- tell pt. to take probiotics 1-2x/day to counter antibiotic
- monitor for hypersensitivity with first dose
- make sure pt know S+S of allergic reaction
- most antibiotics best taken on an empty stomach
penicillins
most effective against gram-positive bacteria
beta-lactamase or penicillinase is the enzyme that allows bacteria to be resistant to penicillin
new penicillins are penicillinase-resistant and there are combination drugs with beta-lactamase inhibitors
kill bacteria by disrupting their cell walls
ex. oxacillin, cloxacillin, penicillin G potassium
role of nurse with penicillins*
- assess previous drug reactions to penicillin
- assess animal products exposed to antibiotics
- avoid cephalosporins if client has history of severe penicillin allergy
- monitor for hyperkalmia and hypernatremia -> increased risk in pt with diabetes mellitus or on dialysis (kidneys)
- monitor cardiac status, including ECG changes
cephalosporins
similar in structure and function to penicillins
broad spectrum activity against gram-negative organisms
have a beta-lactam ring and are bactericidal
cross sensitivity with penicillins -> 5-10% of the population
are divided into 4 generations -> 1st and 2nd generation of cephalosporins will no cross the blood brain barrier * if treating meningitis must be a a 3rd or 4th generation
inhibits cell wall synthesis
ex. cefazolin
role of nurse with cephalosporin therapy *
assess for presence or history of bleeding disorders
-> cephalosporins may reduce prothrombin levels
assess renal and hepatic function -> especially in elderly
assess for persistent diarrhea in children
avoid alcohol -> will cause vomiting, creates an disulfiram (Antabuse) like reaction (med used to treat alcoholism, creates unpleasant side effects)
tetracyclines
broadest spectrums of any abx class -> effective against gram-positive and gram-negative organisms
treats Rocky Mountain spotted fever, peptic ulcers caused by H. pylori, and chlamydial infections
ex. doxycycline, tetracycline
role of nurse tetracycline therapy*
- tetracyclines decrease effectiveness of oral contraceptives -> use back up birth control while taking med
- increases potential for vaginal yeast infections while taking oral contraceptives and tetracylines
- use in caution in clients with impaired kidney or liver function
- take on empty stomach, increases absorption
- may cause photosensitivity -> wear SPF 100
- do not take with milk products, iron supplements, magnesium containing laxatives, or antacids (fluoros)
- watch for supra infection such as pseudomembranous colitis
acronym for tetracyclines adverse effects
tetracyclines = teeth and tan lines
teeth discolouration and photosensitivity
macrolides
safe alternative to penicillin
broad spectrum so superinfections may occur
-mycin
ex. erythromycin, clarithromycin
EES
EES = erythromycin estolate
however in vernal EES represents all macrocodes
EES interacts with the liver -> CYP
role of nurse in macrolide therapy*
- watch the liver with EES
- multiple drug-drug interactions occur with macrocodes -> CYP
- monitor -> exacerbates heart disease
- causes a metallic taste in mouth
aminoglycosides
reserved for serious systemic infections caused by aerobic gram-negative bacteria
ex. gentamycin, tobramycin
adverse effects of aminoglycosides*
- more toxic than most antibiotics
- have potential to cause serious adverse effects
-> ototoxicity - worse if given with Lasix (furosemide)
-> nephrotoxicity - worse if given with Zovirax (acyclovir)
-> neuromuscular blockage - including respiratory paralysis - last names don’t work with this family and macrolides
fluoroquinolones*
- decreased by 90% if taken with multivitamins or minerals such as calcium, magnesium, iron, or zinc (tetras 50%)
- IV is the same as taking PO, therefore easy to transition home
- don’t give to teenagers or athletes!!! risk of tendon rupture
- can cause C.diff
- QT prolongation/arrhythmias (IRR vs RRR)
ex. ciprofloxacin, levofloxacin, moxifloxacin
role of the nurse fluoroquinolone therapy*
- decreased WBC
- monitor pt with liver and renal dysfunction
- watch for liver failure
- teach that drugs may cause dizziness and lightheadedness
- advise against driving or performing hazardous tasks while taking med
**
- Norfloxacin may cause photophobia -> light hurts eyes
- teach that drug (Cipro specifically) may affect tendons especially in children
- do NOT give to athletes
- monitor for dysrhythmias
- crosses into breast milk
sulfonamides*
- widespread use had lead to increased resistance and decreased usage/prescription (Rx)
- used in a combination to treat UTIs
- anti-inflammatory properties of sulfonamide component can help with RA and ulcerative colitis
- teratogenic (birth defects)
- do not take while breastfeeding or pregnant
allergic reactions and sulphonamides*
- caution reaction to a sulfonamide abx could mean allergy to other sulfonamide meds
examples -> - diabetes mellitus sulfonylureas - glyburide (glynase, diabeta) and glimepiride (Amaryl)
- NSAIDS - celecoxib
- certain diuretics - furosemide and chlorothiazide
- IBD meds - sulfasalazine
allergy to these meds may cause sensitivity to abx -> caution with 1st dose
trimethoprim-suldamethoxazole *
a sulfonamide
aka. tmp/smz
Bactrim, Septra, Cotrimoxazole
mechanism of action = to kill bacteria by inhibiting bacterial metabolism of folic acid
primary use = broad spectrum for UTIs, pneumocystis carinii pneumonia, shigella, and bronchitis
adverse effects = skin rashes, N/V, agranulocytosis or thrombocytopenia (use cautiously with pernicious anemia), photosensitivity