Drugs Need to Know: Anti-Infective/Antibiotic/Antiprotozoal Flashcards
trimethoprim/sulfamethoxazole trade name(s)
Bactrim Bactrim DS Septra Septra DS Sulfatrim Sulfatrim DS Sulfatrim Pediatric
trimethoprim/sulfamethoxazole
Therapeutic Class
anti-infectives
antiprotozoals
trimethoprim/sulfamethoxazole
Pharm Class
folate antagonists
sulfonamides
trimethoprim/sulfamethoxazole
Indications
Treatment of:
Bronchitis, Shigella enteritis, Otitis media, Pneumocystis jirovecii pneumonia (PCP), Urinary tract infections, Traveler's diarrhea. Prevention of PCP in HIV-positive patients.
Unlabeled Use(s): Biliary tract infections, osteomyelitis, burn and wound infections, chlamydial infections, endocarditis, gonorrhea, intra-abdominal infections, nocardiosis, rheumatic fever prophylaxis, sinusitis, eradication of meningococcal carriers, prophylaxis of urinary tract infections, and an alternative agent in the treatment of chancroid. Prevention of bacterial infections in immunosuppressed patients.
trimethoprim/sulfamethoxazole
Action
Combination inhibits the metabolism of folic acid in bacteria at two different points
trimethoprim/sulfamethoxazole
Therapeutic Effects
Bactericidal action against susceptible organisms
>Many gram+positive aerobic pathogens
>Many gram-negative aerobic pathogens
trimethoprim/sulfamethoxazole
Contraindication
Hypersensitivity to sulfonamides or trimethoprim;
History of drug-induced immune thrombocytopenia due to sulfonamides or trimethoprim
Megaloblastic anemia secondary to folate deficiency;
Severe hepatic or renal impairment;
Pregnancy, lactation, or children <2 mo
trimethoprim/sulfamethoxazole
Precautions
Use Cautiously in:
Mild to moderate hepatic or renal impairment (dose ↓ required if CCr <30 mL/min);
Genetic implication Glucose–6–phosphate dehydrogenase deficiency (↑ risk hemolysis);
HIV-positive patients (↑ incidence of adverse reactions);
Concurrent use with other products containing propylene glycol (IV only) (↑ risk of lactic acidosis).
trimethoprim/sulfamethoxazole
Adverse Effects
ERTHEMIA MULTIFORM STEVENS-JOHNSONS TOXIC EPIDERMAL NECROLYSIS C.DIFF ASSOC. DIARRHEA HEPATIC NECROSIS
trimethoprim/sulfamethoxazole
Side Effects
rash nausea vomiting headache fatigue hallucinations hyperkalemia hypoglycemia
trimethoprim/sulfamethoxazole
Drug-Drug Reactions
> May ↑ half-life, ↓ clearance, and exaggerate folic acid deficiency caused by phenytoin.
May ↑ effects of sulfonylureas, pioglitazone, rosiglitazone, repaglinide, phenytoin, digoxin, and warfarin.
May ↑ toxicity of methotrexate.
↑ risk of thrombocytopenia from thiazide diuretics (↑ in geriatric patients).
↓ levels of and ↑ risk of nephrotoxicity with cyclosporine.
Concurrent use with >ACE inhibitors may ↑ risk of hyperkalemia
May ↓ the effects of tricyclic antidepressants.
Concurrent use with leucovorin may result in treatment failure and ↑ risk of death (avoid concurrent use)
trimethoprim/sulfamethoxazole
Assessment
> assess for infection
Obtain specimen for culture and sensitivity before initiating therapy
Inspect IV site, Phlebitis common.
>Monitor bowel function
>Assess for rash
>Monitor CBC and UA frequently for May produce ↑ serum bilirubin, ↑ potassium, creatinine, and alkaline phosphatase.
May cause hypoglycemia.
trimethoprim/sulfamethoxazole
Patient Teaching
> Empty stomach, full galss of water, 1 hr before or 2hr after meals, may take with food if GI upset occurs
Take medicine as directed
Complete whole course
notify doctor if rash, sore throat, fever, mouth sores, or unusual bleeding or bruising occurs
Proper dilution, rate, and admin of drug and IV equipment
trimethoprim/sulfamethoxazole
Routes
PO, IV
Ampicillin
Trade Names
Omnipen
Amcill
Polycillin
Principen
Ampicillin
Therapeutic Class
anti-infectives
Ampicillin
Pharm Class
aminopenicillins
Ampicillin
Indications
Treatment of the following infections: Skin and skin structure infections, Soft-tissue infections, Otitis media, Sinusitis, Respiratory infections, Genitourinary infections, Meningitis, Septicemia. Endocarditis prophylaxis.
Unlabeled Use(s): Prevention of infection in certain high-risk patients undergoing cesarean section.
Ampicillin
Action
Binds to a bacterial cell wall, resulting in death.
Ampicillin
Therapeutic Effects
Bactericidal action, broader spectrum that penicillin
Ampicillin
Contraindication
Penicillin hypersensitivity
Ampicillin
Precautions
> Severe renal insufficiency (dose ↓ required if CCr <10 mL/min);
Infectious mononucleosis, acute lymphocytic leukemia or cytomegalovirus infection (↑ incidence of rash);
Patients allergic to cephalosporins;
Lactation: Distributed into breast milk. Can cause rash, diarrhea, and sensitization in the infant.
Ampicillin
Adverse Effects
SEIZURES (High Doses)
C.DIFF
ANAPHYLAXIS
SERUM SICKNESS
Ampicillin
Side Effects
Diarrhea rash superinfection nausea vomiting urticaria blood dyscrasias
Ampicillin
Drug-Drug Reactions
> Probenecid ↓ renal excretion and ↑ blood levels of ampicillin–therapy may be combined for this purpose.
Large doses may ↑ the risk of bleeding with warfarin.
↑ risk of with concurrent allopurinol therapy.
May ↓ the effectiveness of oral hormonal contraceptives.
Ampicillin
Assessment
> Observe for anaphylaxis
Keep epinephrine, antihistamine, and CPR equipment nearby when administering
Monitor bowel function for diarrhea or bloody stools
assess for rash, infection
before therapy obtain history, and specimen for culture and sensitivity
Ampicillin
Patient Teaching
> Take whole course as directed
Report signs of infection or allergy
Notify immediately for fever and diarrhea
Use an alternate or additional form of nonhormonal birth control
Ampicillin
Routes
PO, IM, IV
Cefazolin
Trade Names
Previously, Ancef
Cefazolin
Therapeutic Class
anti-infectives
Cefazolin
Pharm Class
first generation cephalosporin
Cefazolin
Indications
Treatment of the following infections due to susceptible organisms:
Skin and skin structure infections (including burn wounds), Pneumonia, Urinary tract infections, Biliary tract infections, Genital infections, Bone and joint infections, Septicemia, Bacterial endocarditis prophylaxis for dental and upper respiratory procedures. Perioperative prophylaxis.
Cefazolin
Action
Binds to bacterial cell wall membrane, causing cell death
Cefazolin
Therapeutic Effects
Bactericidal action against susceptible bacteria.
>Against many gram + cocci
>Against some gram - rods
Cefazolin
Contraindications
Hypersensitivity to cephalosporins
serious hypersensitivity to penicillins
Cefazolin
Precautions
> Renal impairment (dose ↓ and/or ↑ dosing interval recommended if CCr <50 mL/min [adults] or <70 mL/min [children])
Hepatic impairment
History of GI disease, especially colitis
OB: Half-life is shorter and blood levels lower during pregnancy; has been used safely.Lactation: Use while breastfeeding only if potential maternal benefit justifies potential risk to infant
Geri: Dose adjustment due to age-related ↓ in renal function may be necessary in older adults.
Cefazolin
Adverse Effects
SEIZURES (High Doses) CDIFF STEVENS-JOHNSONS ANAPHYLAXIS SERUM SICKNESS
Cefazolin
Side Effects
diarrhea nausea vomiting rash pain at IM site Phlebitis at IV site thrombocytopenia neutropenia leukopenia cramps pruritis urticaria superinfection
Cefazolin
Drug-Drug Reactions
Probenicid decreases excretion and increases blood levels of renally excreted cephalosporins
Cefazolin
Route
IM, IV
Cefazolin
Assessment
> Observe for anaphylaxis
Observe for rash, discontinue if occurs.
Monitor bowel function
Observe for infection
Monitor labs
Before initiating therapy obtain history and specimens for culture and sensitivity
Cefazolin
Patient Teaching
Report signs of superinfection
Notify immediately of rash, fever, or diarrhea occurs
Doxycycline
Trade Names
Acticlate Doryx Doryx MPC Doxy Oracea Vibramycin
Doxycycline
Therapeutic Class
anti-infectives
Doxycycline
Pharm Class
tetracyclines
Doxycycline
Indications
Treatment of various infections caused by unusual organisms, including:
Mycoplasma,
Chlamydia,
Rickettsia,
Borellia burgdorferi.
Treatment of inhalational anthrax (postexposure) and cutaneous anthrax.
Treatment of gonorrhea and syphilis in penicillin-allergic patients.
Prevention of exacerbations of chronic bronchitis.
Treatment of acne.
Treatment of inflammatory lesions associated with rosacea (Oracea only).
Malaria prophylaxis.
Doxycycline
Action
Inhibits bacterial protein synthesis at the level of the 30S bacterial ribosome.
Low-dose products used in the management of periodontitis inhibit collagenase.
Doxycycline
Therapeutic Effects
Bacteriostatic action against susceptible bacteria >some gram + pathogens >anthrax >some gram - pathogens >other pathogens >mycoplasma >Treponema pallidum >Chlamydia, >Rickettsia, >Borrelia burgdorferi.
Doxycycline
Contraindications
Hypersensitivity
Avoid alcohol products and bisulfites
Pregnancy in last half
Doxycycline
Precautions
Pregnancy
Breastfeeding
Children <8
Doxycycline
Adverse Affects
DRESS ERYTHEMA MULTIFORM EXFOLIATIVE DERMATITIS STEVENS-JOHNSONS TOXIC EPIDERMAL NECROLYSIS CDIFF HEPATOTOXICITY PANCREATITIS
Doxycycline
Side Effects
photosensitivity hypersensitivity superinfection n/v/d intercranial hypotension headache rash dysphagia esophagitis glossitis phlebitis at IV site blood dyscrasias
Doxycycline
Drug-Drug Reactions
> May ↑ effect of warfarin.
May ↓ effectiveness of estrogen-containing oral contraceptives.
Antacids, calcium, iron, and magnesium form insoluble compounds (chelates) and ↓ absorption of tetracyclines; this effect is least with doxycycline.
Cholestyramine or colestipol ↓ absorption of tetracyclines.
Adsorbent antidiarrheals may ↓ absorption.
Barbiturates, carbamazepine, or phenytoin may ↓ effectiveness.
Isotretinoin may ↑ risk of intracranial hypertension; avoid concomitant use.
Doxycycline
Drug-Food Reactions
Calcium in food or dairy products decrease absorption by forming insoluble compounds
Doxycycline
Routes
PO, IV
Doxycycline
Assessment
> Monitor bowel function
Assess for rash, discontinue if severe or fever also occurs
Assess IV site for thrombophlebitis
Assess for infection
Obtain culture and sensitivity before initiating therapy
Doxycycline
Patient Teaching
> Take whole course as directed
Notify immediately if rash or diarrhea, or signs of superinfection
Use sunscreen and protective clothing
Take calcium or iron 1-3 hours before or after doxycycline
Gentamicin
Trade Names
Garamycin
Gentamicin
Therapeutic Class
anti-infectives
Gentamycin
Pharm Class
aminoglycosides
Gentamycin
Indications
> Treatment of serious gram-negative bacterial infections and infections caused by staphylococci when penicillins or other less toxic drugs are contraindicated.
In combination with other agents in the management of serious enterococcal infections.
Prevention of infective endocarditis.
Topical Ophth: Treatment of localized infections due to susceptible organisms.
Gentamicin
Action/Therapeutic Effects
Bactericidal action, inhibits protein synthesis in bacteria at 30S ribosome.
Gentamicin
Contraindications
> Hypersensitivity to gentamicin or other aminoglycosides
bisulfate intolerance
Pregnancy
Neonates
Gentamicin
Precautions
>Renal impairment >Hearing impairment >Neuromuscular diseases >Neonates >Geriatric
Gentamicin
Adverse Reactions/Side Effects
Ototoxicity (vestibular & cochlear) nephrotoxicity ataxia vertigo hypersensitivity muscle paralysis (high IV doses)
Gentamicin
Drug-Drug Interactions
> Inactivated by penicillins and cephalosporins when coadministered to patients with renal insufficiency.
Possible respiratory paralysis after inhalation anesthetics or neuromuscular blockers.
↑ incidence of ototoxicity with loop diuretics.
↑ incidence of nephrotoxicity with other nephrotoxic drugs.
Gentamicin
Routes
IM, IV, IT(intrathecal)
Gentamicin
Assessment
> Assess for infection
Evaluate eighth cranial nerve by audiometry before and throughout
Monitor I&O
Obtain specimen for culture and sensitivity before therapy initiation
Monitor blood levels for toxicity