Pharmacology Flashcards
Adrenaline Preparation
1mg 1ml
Adrenaline Indications
Cardiac Arrest Anaphylaxis Severe Asthma Moderate-Severe Stridor Epistaxis Significant Wound Bleeding
Adrenaline Doses
1mg IV @4/60 0.5mg IM @10/60 or @5/60 if anaphylactic and not improving/deteriorating 2ml per IN 5mg Neb 0.1mg/ml topical
Adrenaline MOA
Adrenergic receptor agonist with alpha and beta effects.
a1- smooth muscle contraction, vasoconstriction (epistaxis, bleeding, & stridor), stimulates glycogenolysis in the liver
a2- sedation & vasoconstriction
b1- increases inotropic, chronotropic, & dronotropic effects of the heart (increased force of contractility, increased HR, increased conduction) (cardiac arrest)
b2- smooth muscle relaxation, vasodilation, bronchodilation, Gi smooth muscle relaxation, stabilizes mast cell membranes decreasing histamine release (asthma & anaphylaxis)
Adrenaline Contraindications
Nil
Adrenaline Precautions
MI
Tachydysrhythmias
Adrenaline Onset
IV 5-10sec
IM 2-5min
Neb, topical, & IN on contact with target site
Adrenaline Duration
Cardiovascular effects last 2-15min
Mast cell membrane effects last several hours
Adrenaline Adverse Effects
Tachycardia Tachydysrhythmias HTN N&V Tremor Headache Andiety Dyspnoea MI Ventricular Ectopy
Amiodarone MOA
Broadspectrum antidysrhythmic with class III activity, blocks K+ channels. Prolongs action potential, reduces automaticity, & prolongs the refractory period of atrial, nodal, & ventricular tissues. Causes a reduction in abnormal electrical activity (ectopy) and stabilizes nodes
Amiodarone Preparation
150mg 3ml
Amiodarone Indication
VF or VT arrest post 1st dose of Adrenaline
Amiodarone Contraindication
Severe allergy to Iodine
VT secondary to cyclic antidepressant OD
Amiodarone Precautions
Nil if in arrest
Poor perfusion Hypotension AF associated with severe sepsis Sick sinus syndrome w/o pacemaker Pregnancy
Amiodarone Doses
300mg IV bolus (x2 ampuoles)
If VF/VT persists after 20/60- 150mg
Amiodarone Onset
5-10/60
Amiodarone Duration
1-4hrs post single dose, but longer in tissues
Amiodarone Adverse Effects
Hypotension N&V Diaphoresis Lightheadedness Brady-dysrhythmias
Amoxicillin/clavulanic acid MOA
Broadspectrum beta-lactam antibiotic that inhibits production of bacterial cell walls causing cell death.
Clavulanic acid inhibits beta-lactamase enzyme from bacteria, reducing/ eliminating beta-lactam antibiotic resistant bacteria.
Amoxicillin/clavulanic acid Preparation
1g of amoxicillin + 200mg of clavulanic acid powder
Amoxicillin/clavulanic acid Indications
Sepsis >12yo + 1 high risk factor + greater than 30min to hospital
Cellulitis
Amoxicillin/clavulanic acid Contraindications
Severe allergy to Penicillins
Anaphylactic to beta-lactam antibiotics
Amoxicillin/clavulanic acid Precautions
Nil
Amoxicillin/clavulanic acid Doses
1.2g IV into a running line over 1-2min
Amoxicillin/clavulanic acid Onset
30-60min
Amoxicillin/clavulanic acid Duration
6-8hr
Amoxicillin/clavulanic acid Adverse Effects
Nil
Aspirin MOA
NSAID that inhibits the production of COX, decreasing prostaglandin production, creating analgesic, anti-inflammatory, anti-pyretic, & anti-platelet effects
Aspirin Preparation
300mg tablets
Aspirin Indication
MI
Aspirin Contraindication
3rd trimester of pregnancy
Aspirin Precautions
Known worsening of bronchospasm with NSAIDs
Known bleeding disorder
Clinically significant bleeding
Aspirin Dose
300mg
Aspirin Onset
30-60min
Aspirin Duration
The life of the platelet, 3-5 days
Aspirin Adverse Effects
Bronchospasm in pts with COPD/Asthma
Chronic use- indigestion, GI ulceration, & bleeding
Increases activity of Warfarin
Ceftriaxone MOA
Broadspectrum cephalosporin antibiotic that inhibits bacterial cell wall synthesis, leading to cell death
Ceftriaxone Preparation
1g/2g powder
Ceftriaxone Indication
Suspected meningococcal septicaemia
Ceftriaxone Dose
2g IV/IM
Ceftriaxone Contraindication
Anaphylaxis to cephalosporins
Ceftriaxone Precaution
Nil
Ceftriaxone Onset
30-60min
Ceftriaxone Duration
24hrs
Ceftriaxone Adverse Effects
Nil
Droperidol MOA
Central dopamine & alpha receptor antagonist, resulting in sedation, reduced agitation, and a state of mental detachment
Droperidol Preparation
2.5mg 1ml
Droperidol Indication
> 12yo with agitated delirium causing mild-moderate risk to safety when Olanzapine has not been administered/ has been ineffective.
Droperidol Contraindication
Nil
Droperidol Precautions
Parkinsons
Concurrent administration of other sedatives
Intoxication
Elderly/frail
Droperidol Dose
10mg IM/IV
Reduce to 5mg if frail
Repeat once after 20/60
Droperidol Duration
4-6hrs
Droperidol Onset
5-10min
Droperidol Adverse Effects
Hypotension- especially if IV dose administered rapidly
Fentanyl MOA
Opiate receptor agonist in the brain & spinal cord causing analgesia
Fentanyl Preparation
100mcg 2mls
Fentanyl Indication
Moderate-severe pain
CPO with severe anxiety
Symptom control during end of life care
Fentanyl Contraindications
Unable to obey commands
Current respiratory depression
Fentanyl Precautions
<1yo
High risk of respiratory depression
Labor
Fentanyl Doses
10-50mcg IV @3-5/60
100mcg IN <80kg repeat 50mcg @10/60
200mcg IN >80kg repeat 100mcg @10/60
Fentanyl Onset
2-5min IV -max analgesic & resp effects may take 10-15min
5-10min IN
Fentanyl Duration
30-60min
Fentanyl Adverse Effects
Respiratory depression Bradycardia Hypotension Sedation N&V Itch Euphoria
Gentamicin MOA
Aminoglycoside antibiotic with broad activity against gram-negative bacteria. Inhibits bacterial cell protein synthesis causing cell death.
Gentamicin Preparation
80mg 2ml
Gentamicin Indication
Sepsis where infection is urinary, abdo, or unknown, >12yo + 1 high risk factor + greater than 30min to hospital
Gentamicin Contraindication
Pregnancy
Gentamicin Precautions
Nil
Gentamicin Doses
<60kg 240mg (x3 amps)
60-80kg 320mg (x4 amps)
>80kg 400mg (x5 amps)
Diluted to 10-20mls and given into running IV line over 1-2min
Gentamicin Onset
30-60min
Gentamicin Duration
24hrs
Gentamicin Adverse Effects
Nil
GTN MOA
Universal vasodilator that causes peripheral blood pooling, decreasing venous return & preload. Decreasing ventricular filling & cardiac output. Decreasing myocardial work & oxygen demand.
GTN Preparation
0.4mg doses
TTS 10 patch 0.5mg per hr
GTN Indications
MI
CPO
HTN associated with autonomic dysreflexia
Patch if not responding to SL doses in CPO or AD
GTN Contraindications
SBP <100
HR <40
HR >150
VT
GTN Precautions
Frail Inferior STEMI or STEMI involving R ventricle Poor perfusion Dysrhythmia ED medication in last 24hrs Known aortic/mitral stenosis
GTN Doses
MI- 0.4mg
CPO- 0.8mg
AD- 0.4-0.8mg
repeat @3-5min
GTN Onset
1-2min SL
10-20min TTS
GTN Duration
15-30min SL in some pts BP effects last several hrs
18hrs TTS but dissipate 10-20min once removed
GTN Adverse Effects
Hypotension Headache Tachycardia Light-headed Flushing
Glucagon MOA
Stimulates glycogenolysis & gluconeogenesis in the liver. Stored glycogen breaks down into glucose.
Glucagon Preparation
1mg powder
Glucagon Indication
Hypoglycaemia when pt can’t swallow or no IV access
Glucagon Contraindication
Nil
Glucagon Precautions
Will be ineffective if pt has undergone strenuous exercise, not eaten food for >12hrs, has adrenal insufficiency, chronic hypoglycaemia, or alcohol-induced hypoglycaemia
Glucagon Dose
> 5yo 1mg IM
<5yo 0.5mg IM
Glucagon Onset
5-10min
Glucagon Duration
15-60min
Glucagon Adverse Effects
Nil
Glucose MOA
Simple carbohydrate readily absorbed (10% & oral) -hypertonic solution
Vehicle for drug delivery (5%) -isotonic solution
Glucose Preparation
10-20g sachet
500ml 10% bag
100ml 5% bag
Glucose Indication
Hypoglycaemia & Crush Injury (10%)
Gentamicin & Sodium Valproate (5%)
Glucose Contraindication
Nil
Glucose Precaution
Nil
Glucose Dose
10-20g oral 100ml IV hypo 500ml 10% IV crush Gentamicin admin pts >20kgs 5% Valproate admin 5%
Glucose Onset
Immediate