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n125 midterm study guide
flashcards of the study guide
20
Pharmacology
Not Applicable
02/09/2011

Additional Pharmacology Flashcards

 


 

Cards

Term


what will affect absorption of medications?

Definition
  • Affected by drug form, route, GI mucosa and motility, food and other drugs, changes in liver
  • The same druggiven IVbypasses the liver, preventing the first-pass effect from taking place, and more drug reaches the circulation.
Term

Describe

Absorption of medications

Definition

Process involving movement of a substance from its site of administration, across body membranes, to circulating fluids.

lipid soluable and nonionized drugs are absorbed faster

Term


Explain Bioavailability and routes of administration

Definition

Bioavailability: refers to the percentage of administered drug dose that reaches the circulation

 

route include IV, Oral, IM, PR, etc

Term


Antagonists versus Agonists

Definition
  • Drugs must bind to an appropriate receptor to achieve the desired effect
  • Can bind onto several different types of sites, sometimes on proteins, lipids, etc.
  • Drugs that produce a response are agonists - stimulates a receptor
  • Drugs that block a response are antagonists blocks a receptor, preventing something else from binding and acting
Term


Controlled substances schedule – schedule I-V and what that means

Definition
  • Schedule I
    • Drug has a high potential for abuse and no currently accepted medical use. No safety demonstrated.
  • Schedule II
    • High potential for abuse. Has a currently accepted medical use but with a severe restriction. Abuse may lead to severe psychological and physical dependence.
  • Schedule III
    • Potential for abuse, less than I and II, has currently accepted medical use. Abuse may lead to moderate or low physical dependence or high psychological dependence.
  • Schedule IV
    • Low potential for abuse relative to classes I-III, has accepted medical use. Abuse may lead to limited physical or psychological dependence.
  • Schedule V
    • Lowest potential for abuse with accepted medical use. Abuse may lead to limited physical or psychological dependence.
Term


Elimination of medications – how monitored

Definition
  • Removal of drug from the body.
  • The rate at which drugs are excreted determines their concentration in the blood and tissues. This determines their duration of action.
  • Main route of removal:Kidneys
  • Other routes: liver, bile, feces, etc.
  • Monitor kidney function by the following test: creatinine, BUN, Creatinine clearance
  • Monitor liver function by the following tests: ALT, AST, GGT, bilirubin
Term


Half-life

Definition
  • Half-life (t ½) refers to the time it takes for one half of the drug concentration to be eliminated.
  • Affected by metabolism and elimination.
  • Liver or kidney dysfunction.
Term


Peak and Trough

Definition
  • Peak = rate of absorption of the drug
  • Peak blood level is drawn at a specific time, according to the route of the drug given
  • Trough = rate of elimination of the drug
  • Trough blood level is drawn immediately before the next dose is given
  • Ex. Aminoglycosides
Term


Superinfection

Definition
superinfections are a secondary infection that occurs when the normal microbial flora of the body are disturbed during antibiotic therapy. Superinfectios can occur in the mouth, respiratory tract etc. Fungus infections frequently result in superinfections, although bacterial organisms such as proteus, pseudomonas and staphylococci may be the offending microorganisms. Superinfections rarely develop when the drug is admin for less than a week they occur more commonly with the use of broad spectrum antibiotics. for fungal infection of the mouth, nystatin is frequently used.
Term


Protein binding and the effect on available medication

Definition
  • Protein-binding effect cant bind with receptors and so inactive
  • Free drugs active
  • Important to check the protein-binding percentage of all drugs administered.
  • Important to check the patients serum protein and albumin levels.
Term


General guidelines for providing patient teaching

Definition
  • General information
  • How to self administer medication
  • Diet considerations
  • Side effects
  • Cultural considerations
  • Take medication as prescribed by your health care provider. If you have questions, call.
  • Keep medication in original labeled container and store as instructed.
  • Keep all medicines out of reach of children. Remind grandparents and visitors to monitor their purses and luggage when visiting.
  • Before using any OTC drugs (including aspirin, laxatives, etc.), check with your health care provider. Pharmacists are good resources to ask before buying or using a product.
  • Bring all medications with you when you visit the health care provider.
  • Know why you are taking each medication and under what circumstances to notify the health care provider.
  • Alcohol may alter the action and absorption of the medication. Use of alcoholic beverages is discouraged around the time you take your medications and is absolutely contraindicated with certain medications.
  • Smoking tobacco alters absorption of some medications (e.g., theophylline-type drugs, tranquilizers, antidepressants, pain medications). Consult your health care provider or pharmacist for specific information.
  • See Box 2-3
Term


Therapeutic range- narrow range

Definition
  • The range between having therapeutic effect and being toxic
  • Some drugs are very narrow, some have wide margins.
  • theraputic drug monitoring especially important for drugs that have a narrow therapeutic range
Term


Side effects versus Adverse effect

Definition

Side Effects:

  • Physiologic effects not related to the desired drug effects
Adverse Effects
  • More severe than side effects
  • Reportable
  • Causes a discontinuation of the drug
Allergy
  • NOT an adverse effect, and not a side effect.
  • This is a potentially life threatening effect
    • Rash
    • Itching
    • Swelling

Term

 

 how is absorption of medications affected in Elderly patients?

Definition
  • Slower absorption of oral medications
  • Impaired circulation can delay transportation of drugs to the tissues
  • Drugs metabolized more slowly & less completely
  • Drugs excreted less completely
  • See Table 11-1

Absorption

  • Slow
  • Increase alkaline GI secretions
  • Decrease motility
  • Distribution
  • Loss of protein binding sites
  • Loss of body water
  • Increase in body fat
Term

 

Pediatric patients and how to administer oral medications

Definition
  • Oral route
    • Syringe:oral syringes ensure more exact dosing of med and are relativelly easy to use.
    • Placement: placed in mouth and pointed toward the buccal mucosa on either side of the mouth. allowing the med to fall too close to the front of the mouth increases the likelihood that medication will be spit out pointing the syringe directly toward the back of the mouth may increase the risk of gagging or choking.
    • To crush or not to crush?Nurses may need to crush pills or dissolve capsules in fluid for administration to pediatric clients.
    • Small volumes, not added to infant formula
    • IM should be given in vastus lateralis
  • Other routes
Term

Pediatric patients and age adaptations for medication administration and teaching

Definition
  • Toddler:
  • Preschoolers
  • School-age children
  • Older-age and adolescent
Term


Penicillin

Definition

Class:Anti-infective/Antibacterials/Penicillins   “cillin”   bacterialcidal. Inhibits enzyme in cell wall synthesis. Most gm – and gm + cocci & bacilli.

type of drug:bacterialcidal/bacteriostatic


uses and action:PCN and cephalosporins work by messing up the cell wall building system!


side effects: Rash (but not a true allergy), Diarrhea, Stomach upset,Nasea, vomiting.


adverse reactions:Hypersensitivity, Gastrointestinal symptoms, Neurotoxicity, Renal dysfunction, superinfections,


patient teaching:


Half Life: Short


Penicillins:

Basic:penicillin G, penicillin V

Broad Spectrum:Amoxicillin, ampicillin, bacampicillin

Penicillinase-Resistant penicillin: cloxacillin, dicloxacillin, methicillin, nafcillin, oxacillin


Penicillinase

  • The bacteria to produce penicillin-destroying enzymes
  • Potassium clavulanate inhibits penicillinase: combined with penicillin

 

Term

 

cephalosporin

Definition

Class:Anti-infective/Antibacterials/Penicillins   “cillin”   bacterialcidal. Inhibits enzyme in cell wall synthesis. Most gm – and gm + cocci & bacilli.

type of drug:bacterialcidal/bacteriostatic


uses and action:PCN and cephalosporins work by messing up the cell wall building system! Treat infections of:

  • Skin, Bone, Heart, Blood, Respiratory tract, Gastrointestinal tract, Urinary tract

Cephalosporins   “cef”  “ceph”   Cef the “GIANT” (Gi; nausea, vomiting, diarrhea   Increase in glucose values   Anaphylaxis may occur; alcohol may cause vomiting    Nephrotoxicity   Thrombocytopenia)

side effects: Diarrhea, Stomach upset,Nasea, vomiting.


adverse reactions:Hypersensitivity, Gastrointestinal symptoms, Neurotoxicity, Renal dysfunction, anemia, superinfections, Thrombophlebitis (when given IV), Sterile abscess (when given IM)


patient teaching:condraindicated if renal disease, lactation, hypersensitivity to penicillins, cephalosporins


Half Life: Short

 

  • First Gen: good gram-positive coverage
  • Second:good gram-positive coverage; some gram-negative coverage
  • Third:less gram-positive coverage; more gram-negative coverage
  • Fourth: good gram-negative coverage

P435

First Gen:Cefadroxil, cefazolin sodium, cephalexin, cephalothin, cephapirin sodium, cephradine

 

Second Gen:cefaclor, cefamandole, cefmetazole sodium, cefonicid sodium, ceforanide, cefotetan, cefoxitin sodium, cefprozil monohydrate, cefuroxime

 

Third:cefdinir, cefixime, cefoperazone, cefotaxime, cefpodoxime, ceftazidime, ceftriaxome, ceftibuten, moxalactam disodium, cefditoren

 

fourth gen: cefepime

Term

 

Macrolides

 

Macrolides   “mycin”  bacteriostatic. Inhibits synth of proteins in bact…for clients allergic to Pen, Gm-and Gm+ coverage….U/*L respiratory, GI, Urinary, skin, soft tissue

Definition

Class:antibacterial


uses and action:

  • Proteins make up much of a bacterial cells structure.
  • Macrolides block the bacterial cells machinery for making new proteins, leaving the cell unable to function.
  • In low doses, Emycin stops bacteria from multiplying; in higher doses, it kills the bacteria
  • Macrolides can kill bacteria that doesnt have a cell wall (unlike PCNs and cephalosporins)
    • This is why emycin works on chlamydia and whooping cough (PCN doesnt work at all on these!)
      • Bacteriostatic: inhibits protein synthesis in the bacterial cell
    • Primarily used for respiratory, gastrointestinal, urinary, skin, and soft tissue infections

 

 

side effects: 

  • STOMACH UPSET!!!!
  • Better with clarithromycin and azithromycin, but horrible with erythromycin!
  • Always take with food or milk for this reason!


adverse reactions:

  • Hypersensitivity
  • Gastrointestinal effects
  • Hepatotoxicity
  • Jaundice

 


Patient teaching:p440 renal insufficiency is not a contraindication for macrolide use. Normally food does not hamper the absorption of acid resistant macrolides


Half Life: Short(except for dirithromycin which is 20-50hrs)

 

macrolides, lincosamides, and tetracyclines are primarily bacteriostatic while vancomycin, aminoblycosides, and fluoroquinolones are bactericidal

 

Drugs in this class

Macrolides: azithromycin, clarithromycin, dirithromycin, and erythromycin which is (frequently prescribed to patients who are hypersensitive to PCN)

 

Term
Tetracyclines   “cycline”   Bacteriostatic. Inhibits protein synth, by binding to ribosomes…Gm+,- aerobes & anaerobes
Definition

Class:antibacterial


uses and action:

  • Also blocks protein making machinery of certain bacteria
  • We dont give these drugs to children 8 and younger due to the effect on bone and tooth enamel.
  • Used to treat chlamydia, but not gonorrhea (now resistant)
  • The BEST for treating some life threatening infections such as cholera and anthrax!
  • Action: inhibit protein synthesis in the bacterial cell; bacteriostatic
  • Broad spectrum
    • Bacteria: gram and gram +
  • Effective against: protozoa, Mycoplasma, Rickettsia, Chlamydia, syphilis, Lyme disease

 

side effects:

  • Nausea
  • Vomiting
  • Diarrhea
  • photosensitivity



adverse reactions:

  • Do not give to children.
  • Affects tooth development from:
    • Fourth month of fetal development to 8 years old
    • Temporary and permanent discoloration of developing teeth
  • Photosensitivity
  • Superinfection
  • Teratogenic in the first trimester of pregnancy
  • Ototoxicity
  • Renal toxicity

 

 


Patient teaching:

  • Not to be taken with antacids, milk due to absorption issues.
  • TCN increases digoxin absorption, which may result in dig toxicity
  • Take on an empty stomach, meaning 1 hour before, or 2 hours after
    • Except for minocycline (Minocin) and doxycycline absorption actually improves if taken with food for these 2 drugs



Half Life: Short but longer than PCN Cephalosporins and macrolides

 

macrolides, lincosamides, and tetracyclines are primarily bacteriostatic while vancomycin, aminoblycosides, and fluoroquinolones are bactericidal

 

 

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