Chemotherapeutic Agents Flashcards
are used to destroy both organisms that invade the body (e.g., bacteria, viruses, parasites, protozoa, fungi) and abnormal cells within the body (e.g., neoplasms, cancers)
Chemotherapeutic drugs
organisms that invade the body
bacteria, viruses, parasites, protozoa, fungi
abnormal cells within the body
neoplasms, cancers
These drugs affect cells by altering cellular function or disrupting cellular integrity, causing cell death, or by preventing cellular reproduction, eventually leading to cell death.
Chemotherapeutic drugs
Chemotherapeutic drugs affect cells by
altering cellular function or disrupting cellular integrity, causing cell death, or by preventing cellular reproduction, eventually leading to cell death.
the basic structural unit of the body
Cell
Each cell has a ____________________________________________, which contains a variety of ______________
nucleus, a cell membrane, and cytoplasm; organelles
contains all genetic material necessary for cell reproduction and for the regulation of cellular production of proteins.
Nucleus
Nucleus contains a spherical mass called
nucleolus
sites of protein synthesis
ribosomes
Within this nucleolus are dense fibers and proteins that will eventually become _____________________
ribosomes
essential for cellular integrity and is equipped with many mechanisms for maintaining cell homeostasis.
Celll Membrane
mainly composed of proteins and lipids— phospholipids, glycolipids, and cholesterol
lipoprotein structure
a lipoprotein structure, mainly composed of
proteins and lipids— phospholipids, glycolipids, and cholesterol
power plants” within each cell that produce energy in the form of ATP,which allows the cell to function.
Mitochondria
membrane-covered organelles that contain specific digestive enzymes that can break down proteins, nucleic acids, carbohydrates, and lipids
Lysosomes
are responsible for digesting worn or damaged sections of a cell when the membrane ruptures and the cell dies.
Lysosomes
designed to target foreign organisms that have invaded and infected the body
ANTI-INFECTIVE AGENTS
ANTI-INFECTIVE AGENTS:
THERAPEUTIC ACTION
- interfere with biosynthesis of the pathogen cell wall.
- interfere with the steps involved in protein and DNA synthesis, functions necessary to maintain the cell and allow for cell division.
- alter the permeability of the cell membrane to allow essential cellular components to leak out
ANTI-INFECTIVE ACTIVITY:
- Bactericidal
- Bacteriostatic
active against the infective microorganisms that they actually cause the death of the cells they affect.
Bactericidal
not as aggressive; they interfere with the ability of the cells to reproduce or divide
Bacteriostatic
a complex interaction among chemical mediators, leukocytes, lymphocytes, antibodies, and locally released enzymes and chemicals.
HUMAN IMMUNE RESPONSE
It is difficult to treat any infections for two reasons:
- Anti-infective drugs cannot totally eliminate the pathogen without causing severe toxicity in the host
- Patients do not have the immune response in place to deal with even a few invading organisms.
refers to the ability over time to adapt to an anti-infective drug and produce cells that are no longer affected by a particular drug.
RESISTANCE
Resistance can be
natural or acquired
ACQUIRING RESISTANCE:
- Producing an enzyme that deactivates the antimicrobial drug
2 Changing cellular permeability to prevent the drug from entering the cell or altering transport systems. - Altering binding sites on the membranes which then no longer accept.
- Producing a chemical that acts as an antagonist to the drug.
ANTI-INFECTIVE AGENTS
PURPOSE:
- For Treatment of Systemic Infections.
- identification of the correct pathogen and selection of a drug (sensitivity)
- Combination Therapy
- Prophylaxis
synergistic, which means that they are more powerful when given in combination
Combination Therapy
to prevent infections before they occur.
Prophylaxis
Inhibit protein synthesis
AMINOGLYCOSIDES
used to treat serious infections caused by susceptible strains of gram negative bacteria, including Pseudomonas aeruginosa, E. coli, Proteus species, the Klebsiella–Enterobacter– Serratia group, Citrobacter species, and Staphylococcus.
AMINOGLYCOSIDES
AMINOGLYCOSIDES is
Bactericidal
A. AMINOGLYCOSIDES
PHARMAKOKINETICS
- poorly absorbed from the GI tract but rapidly absorbed after intramuscular (IM) injection. widely distributed throughout the body, cross the placenta and enter breast milk, and are excreted unchanged in the urine
AMINOGLYCOSIDES
CONTRAINDICATIONS/ CAUTIONS:
Allergy
Hepatic disease
Renal disease
Preexisting Hear loss
Herpes/ Mycobacterial Infection
Myasthenia gravis or parkinsonism
Lactation
AMINOGLYCOSIDES
ADVERSE EFFECTS:
- Black box warning alerting health care professionals to the serious risk of: ototoxicity and nephrotoxicity.
- GI effects include nausea, vomiting, diarrhea, weight loss, stomatitis, and hepatic toxicity.
- Cardiac effects can include palpitations, hypotension, and hypertension
- Hypersensitivity reactions include purpura, rash, urticaria, and exfoliative dermatitis.
AMINOGLYCOSIDES
Observe for :
OTOTOXICITY
NEPHROTOXICITY
are a relatively new class of broad-spectrum antibiotics
CARBAPENEMS
used to treat serious infections caused by susceptible strains of S. pneumoniae, Haemophilus infl uenzae, Moraxella catarrhalis, S. aureus, Streptococcus pyogenes, E. coli and others.
CARBAPENEMS
indicated for treating serious intra-abdominal, urinary tract, skin and skin structure, bone and joint, and gynecological infect
CARBAPENEMS
First drug of Class
Meropenem
CARBAPENEMS
PHARMAKOKINETICS
- Rapidly absorbed if given IM
- They are widely distributed throughout the body, although it is not known whether they cross the placenta or enter breast milk.
- excreted unchanged in the urine
CARBAPENEMS
CONTRAINDICATIONS/ CAUTIONS:
- allergy to any of the carbanems or beta-lactams
- seizure disorders
- meningitis
- lactation
- Use caution during pregnancy
- Ertapenem is not recommended for use in patients younger than 18 years of age.
CARBAPENEMS
ADVERSE EFFECTS:
- GI tract can limit the use of carbapenems in some patients.
- Pseudomembranous colitis, Clostridium difficile diarrhea
nausea and vomiting can lead to serious dehydration and
electrolyte imbalances. - Superinfections can occur with any of the carbapenems.
- CNS effects can include headache, dizziness, and altered mental state.
- Seizures
CARBAPENEMS
Monitor the patient regularly for signs of:
- pseudomembranous colitis
- severe diarrhea,
- superinfections
- confusion and seizures
- phlebitis
basically interfere with the cell wall–building ability of bacteria when they divide
CEPHALOSPORINS