Pharmacology Flashcards
Area under the curve
-average amount of a drug in the blood after a dose is given –> bioavailability
Drugs that commonly cause inhibition of CYP450 system
- Macrolides
- antifungals
- Cimetidine
- Citalopram
- grapefruit juice
Antibiotic with highest risk of C.diff
Clindamycin (Cleocin)
Lincosamide class
Digoxin therapeutic levels
-0.5-2
Signs of digoxin toxicity
- GI: anorexia, N/V, abdominal pain
- scotoma, yellow-green tinge vision
Labs for suspected digoxin toxicity
- digoxin level
- electrolytes
- creatinine
- EKGs
Digoxin toxicity treatment
-Digibind
Citalopram (Celexa) contraindications
QT prolongation
Frequency of testing INR
every 2-4 weeks up to every 12 weeks
What to do if INR <5 with no significant bleeding risk
- omit one dose and/or
- reduce maintenance dose slightly
- check INR
What to do if warfarin dose missed
- take as soon as possible on the same day
- do NOT double dose next day
After warfarin is discontinued, how long will the anticoagulant effects persist
2-5 days
What medication should not be combined with diuretics
- Lithium
- risk of lithium toxicity
Patients with HTN and osteoporosis have extra benefit from what medication
- thiazide diuretics
- reduce calcium excretion by kidneys and stimulate osteoblasts
Spironolactone adverse effects
-gynecomastia and hyperkalemia
BBW Spironolactone
-increased risk of benign and malignant tumors
Loop diuretic should not be given to patients with what allergy
sulfa
Loop diuretic adverse effects
- electrolyte imbalance
- hypovolemia
- hypotension
- pancreatitis, jaundice, rash
- ototoxicity
Noncardioselective BB
- propranolol
- carvedilol (Coreg)
Cardioselective BB
- blocks beta 1
- atenolol
- metoprolol
BB contraindications
-asthma
COPD
-bradycarida
AV block 2nd-3rd
BB adverse effects
- bronchospasm
- bradycardia
- depression, fatigue
- ED
- blunts hypoglycemic response
- HF
ACE/ARB adverse effects
- hyperkalemia
- cough
- angioedema
Direct renin inhibitor example
- Aliskerin (Tekturna)
- not recommended for initial treatment
When does ACE induced cough usually begin
- first few months of treatment
- discontinue and switch to ARB
Which antihypertensive preferred for HTN in diabetics and patients with CKD
ACEI/ARBs
T/F ACEI/ARB excreted in breastmilk
true
avoid
First line medication for Raynauds
CCB
Verapamil should not be mixed with
erythromycin
clarithromycin
CCBs are contraindicated with
AV block
bradycardia
CHF
up to 25% of patients using verapamil develop ___
constipation
CCB adverse effects
- headache
- peripheral edema
- bradycardia
- HF and heart block
- hypotension
- QT prolongation
- constipation
Alpha-blockers are used when
-patients with BPH and HTN
alpha-blocker examples
- Terazosin (Hytrin)
- Doxazosin (Cardura)
Alpha-blocker adverse effects
- orthostatic hypotension
- dizziness, syncope
- priapism
- do not give with cataract/glaucoma surgery
Tetracyclines can cause permanent teeth staining and skeletal defects in who
- children <9
- last half of pregnancy
- infancy
Tetracycline adverse reactions
- photosensitivity with minimal sunlight
- esophageal ulcerations very rare
When are tetracyclines best taken at
-empty stomach
take 1-2 hours before a meal
Tetracycline organism coverage
G- only
Atypicals
MRSA
Macrolide organism coverage
G+ (except enterococci)
Some G-
atypicals
Macrolide adverse effects
- GI distress
- ototoxicity
- QT prolongation
If patient can not tolerate erythromycin, switch to
Azithromycin or clarithromycin
Macrolide and warfarin
INR may be increased
First generation cephalosporin coverage
- G+ cocci
- not effective against MRSA
- poor anaerobic coverage
Cephalexin
Keflex
1st
Cefadroxil
Duricef
1st
What are 1st generation cephs good for
skin infections
Second generation cephalosporin coverage
G+
G-
proteus
Cefuroxime
Ceftin
2nd
Cefaclor
Ceclor
2nd
Cefprozil
Cefzil
2nd
Third generation cephalosporin coverage
weak G+
G-
beta-lactamase
Cefixime
Suprax
3rd gen
Extended spectrum 3rd gen coverage
G+
G-
beta lactamase
Ceftriaxone
Rocephin
ES 3rd
Cefdinir
Omnicef
ES 3rd
MRSA treatment
- Bactrim
- Doxycyline
- minocycline
PCN coverage
-G+
G-
PCN adverse reactions
-diarrhea
C.diff
-vaginitis
-SJS
Patient with mono and strep throat
-use macrolide
Dicloxacillin indication
- penicillinase producing staph
- mastititis and impetigo
Type 1 IgE mediated reactions
Anaphylaxis
angioedema
Some women on which antibiotic will complain of candida vagnitis symptoms
- amoxicillin
- recommend probiotics or eating yogurt
FQ coverage
-G-
-some atypicals
3rd gen: newer generations have G+ coverage
Ciprofloxacin
Cipro
2nd gen FQ
Gut and urinary infections
Levofloxacin
Levaquin
3rd gen respiratory FQ
Moxifloxacin
Avelox
4th gen resp FQ
FQ BBW
- increased risk of Achilles tendon rupture
- avoid strenuous exercise
- reserved for patients with no other choice of abx
Which abx used for anthrax infection and prophylaxis
Cipro
Which abx used for traveler’s diarrhea
Cipro
Floxin otic drops indicated for
OM with perforated TM
FQ drug interactions
- FQs
- amiodraone
- macrolides
- TCAs
- antipsychotics
- electrolyte imbalances
- increased risk of arrhythmia
FQs not to be used with which people
- <18 years old
- pregnant or breastfeeding women
Patient on FQ c/o difficulty walking plan
-Order US r/o tendon rupture or neuropathy
First line drug to treat pseudomonal PNA for cystic fibrosis
Cipro
Which antibiotic has best activity against Pseudomonas
Cipro
Other sulfa-type drugs
- diruretics
- sulfonylureas
- COX-2 inhibitors
- Dapsone
- sulfasalazine
- Nitrofurantoin
Pregnant women with UTI preferred abx
- amoxicillin
- cephalosporin
HIV positive patients are at greatest risk for what with sulfa
-SJS
Short acting topical nasal decongestants
- Oxymetazoline (Afrin)
- Phenylephrine (Neo-Synephrine)
Which antihistamine has lowest sedation
Loratidine (Claritin)
Which antihistamine is more potent and longer acting
Cetirizine (Zyrtec)
NSAID option for patients which high risk for GI bleed
Celecoxib
NSAIDs should not be used with ASA because
reduces ASA cardioprotective effects
NSAIDs may worsen ___ in patients who were previously well controlled
HTN
Max regular strength acetaminophen dose in >12
3250 mg/24 hours
Max extra strength tylenol /day
3000 mg /24 hours
Max extended release tylenol /day
3900 mg/day
Tylenol should not be used for more than ___
10 days
Antidote for tylenol
Acetylcysteine (MucoMyst)
Capsaicin cream can be used to treat what kind of pain
trigeminal neuralgia
PHN
ASA should be discontinued if patient complains of what
tinnitus
possible ASA toxicity
Side effects of chronic steroid use
- HPA suppression
- Cushing syndrome
- osteoporosis
- immunosuppression
- skin changes
Drugs that require eye exams
- Digoxin
- Linezolid
- Corticosteroids
- FQs
- Viagra, Cialis, Levitra
- Accutane
- Topamax
- Plaquenil
With which illegal substances will pupils constrict
- Miosis
- Prescription opioids
- meth
With which illegal substances will pupils dilate
- Mydriasis
- cannabis
- cocaine
Which illegal substance can cause severe dental caries
-meth
Category X drugs
- Finasteride
- Isotretinoin
- Warfarin
- Misoprostol
- Androgenic hormones
- Live virus vaccines
- Thalidomide, DES, methimazole
Information required on prescription pads
- name
- designation
- license number
- NPI number
- supervising physician name/ designation
- clinic address
Which schedule of drug can not be called in to the pharmacy
2
5 rights of prescribing
- right patient
- right dose
- right drug
- right time
- right route
Preferred method of drug prescriptions for Medicaid and Medicare
E-prescribing
Feverfew
migraine headache
Cinnamon
improve blood sugar and cholesterol
Glucosamine (with or without chondroitin)
osteoarthritis
Natural progesterone cream from wild yam root extract
-premenstrual symptoms (hot flashes)
Isoflavones (soy beans)
Estrogen like effects
Saw palmetto
urinary symptoms of BPH
Kava kava, valerian root
-anxiety and insomnia
St. John’s wort
mild depression
Tumeric
Alzheimer’s
arthritis
cancer
What should not be mixed with St.John’s wort
-SSRIs
-sumatriptan
-HIV protease inhibitors
etc
Ayurveda
healing system from India
-food, spices, herbs, yoga, lifestyle to prevent disease
Type1 reaction
IgE mediated
anaphylaxis
Benzo with shortest half life
-Triazolam (Halcion)
2 hours
Benzo with longest half life
Clonazepam (Klonipin)
34 hours
Anticholinergic overdose
-mydriasis (dilation)
-flushing
-fever
-urinary retention
delirium/HA
Drug interactions with levothyroxin
- anticoagulants
- TCA
- antacids and calcium
- iron
- Multivitamin
- PPI
- estrogen
- statins
- metformin, etc
- space out several hours apart