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Medication Calculations > Med Calculations > Flashcards

Med Calculations Flashcards

1
Q

These tablets are not meant to be crushed and and prevent gastric mucosa irritation.

A

Enteric Coated tablets

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2
Q

Amounts less than ____ should be measured in a syringe, rather than a medicine cup.

A

10mL

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3
Q

Order: Levothyroxine 75mcg po oc
Supply: Levothyroxine 0.15mg per tab
How many tabs should you give?

A

convert mg -> mcg = 150mcg
D/SxQ=
75/150x1
=0.5 tabs should be given.

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4
Q

Levothyroxine 0.05mg po oc
Supply: Levothyroxine 25mcg tab
How many tabs should the patient receive?

A 
Convert - 0.05mg to mcg
= 50mcg
D/SxQ=
50/25x1= 2
2 tabs should be given.
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5
Q

Order: Avapro 0.25g po q4h
Supply: Avapro 50mg tabs
How many tabs should be given?

A

Convert - 0.25g=25mg
D/SxQ=
25/50x1= 0.5
0.5 tabs should be given.

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6
Q

Order: Pregabalin 150mg po BID
Supply: Pregabalin 50mg capsules

How many capsules should they receive?

A

D/SxQ=

150/50x1 = 3

3 capsules should be given

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7
Q

Meperidine 75mg po q4h prn
Supply: Meperidine 50mg/5mL

How much suspension should they receive?

A

D/SxQ=

75mg/50mgx5mL

=7.5mL should be given

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8
Q

Amoxicilin 100mg po qid
Supply: Amox 125mg/5ml

Hw much should they receive?

A

D/SxQ=

100/125x5=

4mL should be given

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9
Q

Digoxin Elixir 250mcg

Supply: Digoxin elixir 0.10mg/mL

A

CONVERT - 250mcg=0.25mg

D/SxQ=

  1. 25/0.10x1mL
  2. 5 mL should be given
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10
Q

Lactulose 10g po daily
Supply: Lactulose 667mg/1mL

How much should they receive?

A

CONVERT - 10g = 10,000mg

D/SxQ=
10000/667x1
=14.99 (15mL) per day

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11
Q

This injection site is typically used for children under 12 months of age.

A

Vastus Lateralis Muscle.

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12
Q

What is the typical maximum amount that can be injected into the deltoid muscle?

A

1 mL

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13
Q

Clindamycin 150mg IM q12H
Supply: Clindamycin 300mg/2mL

How much should they receive?

A

D/SxQ=

150mg/300mgX2mL
=1mL should be given

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14
Q

Demerol 75mg IM q4h
Supply: Demerol 50mg/mL

How much demerol should be given each dose, and how much is given each day?

A

D/SxQ=

75mg/50mgX1mL
=1.5mL is given each dose

1.5mL x 6 (q4h) = 9mL is given each day

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15
Q

Heparin NA 1500 Units SC q12h
Supply: Heparin NA 5000 Units/0.5ml

How much should the patient receive?

A

D/SxQ=

1500U/5000Ux0.5mL

=0.15mL should be given

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16
Q

Which type of insulin do you draw up first in a syringe, Cloudy or Clear?

A

CLEAR, this is because you do NOT want to introduce cloudy insulin to a clear insulin vial

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17
Q

Which insulins are clear? Rapid and short acting insulins, or intermediate acting insulin?

A

Rapid / Short acting insulin is clear, intermediate insulin is cloudy.

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18
Q

Convert 10lb 12 oz into Kilograms.

A

12oz/16oz=0.75lbs

1kg =2.2lbs
_kg=10.75lbs

10.75lbs/2.2lbs/kg = 4.88 (4.9) kg

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19
Q

Convert 18 lbs 4oz into kilograms.

A

4oz/16oz=0.25lbs

1kg=2.2lbs
_kg=18.25lbs

18.25lbs/2.2lbs/kg= 8.29 (8.3) kg

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20
Q

Hydroxyzine HCl 20mg IM q4h for a child that weighs 44lbs.

[Safe dosage is 0.5mg - 1mg/kg/dose every 4 hours prn].

Calculate, and identify if this is a safe dosage for this child.

A

Convert lbs into kg - 44lbs/2.2lbs/kg= 20kg

Minimum dose= 0.5mgX20kg = 10mg/dose q4h

Max dose = 1mgX20kg = 20mg/dose q4h

This is a safe dosage for the child.

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21
Q

Amoxicillin 200mg PO q8h for a child weighing 22lbs.

Safe range for Amoxicillin is 20-40 mg/kg/day if divided every 8 hours.

Calculate, and identify if this is a safe dosage for the child.

A

Convert weight into kg.
22/2.2lbs/kg= 10kg

Minimum dose = 20mg/kg/dayX10kg= 200mg/day
200mg/3 (q8h) = 66.7mg/q8h dose

Maximum dose = 40mg/kg/dayX10kg= 400mg/day
400mg/3 = 133.3mg/q8h dose

range is 66.7mg - 133.3mg every 8 hours for this child, making the dosage of 200mg UNSAFE.

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22
Q

Tobramycin 35mg IV q8h for a child weighing 14kg.

Safe range for drug is 6-7.5mg/kg/day

Calculate and identify if the dose is safe for this child.

A

Weight conversion not needed.

Minimum dose = 6mg/kg/dayX14kg = 84mg/day
84mg/3 doses (q8h) = 28mg q8h

Max dose = 7.5mg/kg/dayX14kg = 105mg/day
105mg/3 = 35mg q8h

This is a safe dose for this child.

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23
Q

How is drops per millilitres shown in a formula?

A

gtt/mL

24
Q

What does the abbreviation D5W mean on an IV bag?

A

Dextrose 5% in water

25
Q

What does the abbreviation D5LR mean on an IV bag?

A

Dextrose 5% in Lactated Ringer’s

26
Q

What does the order D5NS 1000mL IV q4h mean?

A

Provide 1000mL Dextrose 5% in Normal Saline IV every 4 hours

27
Q 
0.45% Saline is an example of an:
A/ Isotonic solution
B/ Hypotonic Solution
C/ Hypertonic Solution
D/ Equilibric Solution
A

B/ Hypotonic solution

Used to dilute excess serum levels of electrolytes (Hyperglycaemia)

28
Q 
0.9% saline is an example of an:
A/ Isotonic solution
B/ Hypotonic Solution
C/ Hypertonic Solution
D/ Equilibric Solution
A

A/ Isotonic solution

Used to expand volume and maintain normal tonicity.

29
Q 
D5% is an example of an:
A/ Isotonic solution
B/ Hypotonic Solution
C/ Hypertonic Solution
D/ Equilibric Solution
A

C/ Hypertonic solution

Used to correct electrolyte imbalances by adding more solutes than solvent. Example: diarrhea

30
Q

Calculate how much D5% is in a 500mL bag, if there is 5g of dextrose in a 100mL bag

A

5g/100mL = Xg/500mL

100X/2500=25g of D5 is in a 500mL bag

31
Q

How much NS 0.9% is in a 1000mL bag, if there is 0.9g in a 100mL bag.

A

0.9g/100mL = Xg/1000mL

900/100X= 9g of NS is in a 1000mL bag

32
Q

A doctor orders 500mL of NS to be infused over 4 hours. What is the amount of NS in mL infused over 1 hour?

A

500mL/4hours= 125mL/hour

33
Q

A doctor orders 50mL of ampicillin to be infused over 30 minutes. What is the mL/h?

A

50mL/30minutesX60mins/h = 100mL/hour

34
Q

The Doctor orders 250mL D5W over 2h. What is the infusion rate in mL/h?

A

250mL/2hours= 125mL/h

35
Q

The Doctor orders 500mL of D5W over 45 minutes. What is the infusion rate in mL/h?

A

500mL/45minX60min= 666.66mL/h

36
Q

A random Doctor orders 3200mL of NS over 25minutes. What is the infusion rate in mL/h?

A

3200mL/25minX60min= 7680mL/h

37
Q

Calculate the flow rate:

D5W 1000mL infused over 10 hours

A

1000mL/10hours = 100mL/h

38
Q

Calculate flow rate

NS 2500mL in 20 hours

A

2500mL/20hours = 125mL/h

39
Q

Calculate the flow rate:

D5W 500mL in 6.5 hours

A

500mL/6.5hours = 77mL/h

40
Q

Calculate the flow rate:

NS 0.4% 500mL infused over 25 minutes.

A

500mL/25minX60min = 1200mL/h

41
Q

Calculate the flow rate:

LR 100mL infused over 45 minutes.

A

100mL/45minX60min = 133.33mL/h

42
Q

In the formula, V/TxC=R

explain what each letter represents

A 
V= volume per hour (125mL/h)
T= Time required to infuse V (25 minutes)
C= Calibration of tubing/Drop factor (15 gtt/mL)
R= Rate of flow in gtt/min (21 gtt/min)
43
Q

Order: D5W NS IV at 50mL/h. Drop factor is 60gtt/mL

What is the drip rate per minute for the IV?

A

V/TxC=R

50mL / 60minutes X 60gtt/mL = 50gtt/min

44
Q

Order: NS IV 3000mL/24h. Drop factor is 15gtt/miL

Calculate the drip rate/min

A

Get 3000mL/24 into mL/1h: 3000/24 = 125mL/h

V/TxC=R

125mL / 60min X 15gtt/mL = 31 gtt/min

45
Q

Order: NS IV 2000mL/12h. Drop factor is 15gtt/mL

Calculate the drip rate/min

A

Convert 2000mL/12h into mL/1h: 2000mL/12h = 167mL/h

V/TxC=R

167mL / 60 min X 15gtt/mL = 41.75 (42) gtt/min

46
Q

Order: LR 500mL/4h. Drop factor is 10gtt/mL

Calculate the drip rate/min

A

Convert 500mL/4h into mL/1h: 500/4 = 125mL/h

V/TxC=R

125mL / 60 min X 10gtt/mL = 21 gtt/min

47
Q

Order: NS 2000mL/12h IV. Drop factor is 15gtt/mL

Calculate the drip rate/min

A

Convert 1000mL/12h into mL/1h: 1000/12 = 83mL/h

V/TxC=R

83mL / 60 min X 15gtt/mL = 21 gtt/min

48
Q

Order: Cefazolin 0.5g in 100mL D5W IV infused over 15min. Drop factor is 10 gtt/mL

Calculate the flow rate in gtt/min

A

V/TxC=R

100mL / 15min X 10gtt/mL = 67gtt/min

49
Q

Order: Oxacillin NA 500mg in 125mL D5W IV infused over 45 minutes. Drop factor is 15gtt/mL

Calculate flow rate in mL/h, and then the flow rate in gtt/min

A

125mL/45minX60min = 167mL/h

V/TxC=R

167mL / 60min X 15gtt/mL = 42gtt/min

50
Q

Order: Amoxicillin 275mg in 500mL NS IV infused over 2 hours. Drop factor is 60gtt/mL

Calculate flow in mL/h, and then the flow rate in gtt/min

A

500mL/2hours = 250ml/h

V/TxC=R

250mL / 60 min X 60gtt/mL = 250gtt/min

51
Q

Order: Cialis 500mg po q2h
Supply: Cialis 125mg

How many pills can you give? How many pills would be given each day?

A

D/SxQ = 500/125x1 = 4 pills can be given every 2 hours

4 pills x 12 = 48 pills per day… mega Boner.

52
Q

Order: NS 2.5L IV to infuse at 175mL/h. Drop factor is 10gtt/mL

What is the flow rate in gtt/min?

A

Convert L to mL - 2.5x1000= 2500mL

V/TxC=R

2500mL / 60 min X 10gtt/mL = 417gtt/min

53
Q

Order: Humulin N 55units and NovoRapid 15units.

Which insulin would you draw from first, and how many mL would you have after drawing up each type of insulin?

A

Draw up NovoRapid first because it is a rapid-acting insulin and is clear, then draw up the Humulin N with is a cloudy-intermediate insulin.

15+55= 70units

100units = 1mL so 70Units = 0.7mL

54
Q

Order: Amoxiclav 300mg PO q8h for a child weighing 39lbs.

Recommended dosage is 20-40mg/kg/day

Is this order safe? calculate the min and max for this medication.

A

Convert lbs to kg - 39lbs/2.2 = 18kg (17.7)

Min dose = 20mg/kg/dayX18kg = 360mg/day
360mg / 3 (q8h) = 120mg per q8h dose

Max dose = 40mg/kg/dayX18kg = 720mg/day
720mg / 3 = 240mg per q8h dose

Therefore, 300mg q8h is too high and unsafe for the child

55
Q

Order: Acetaminophen 200mg PO q12h for a child weighing 53 lbs.

Recommended dosage is 10-15mg/kg/day

Is this order safe? calculate the min and max for this med

A

Convert lbs to kg - 53/2.2 = 24kg

Min dose = 10mg/kg/dayX24kg = 240mg/day
240mg/day / 2 (q12h) = 120mg q12h

Max dose = 15mg/kg/dayX24kg = 360mg/day
360mg/day / 2 (q12h) = 180mg q12h

200mg q12h is an unsafe dose for this child as is it too high.

Medication Calculations (3 decks)

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