dose calculation

CONVERSION FACTORS EQUIVALENTS:

• 1 mg = 1000 micrograms• 1 gm = 1000 milligrams • 1 Kg = 1000 grams• 1 Kg = 2.2 pounds • 1 L = 1000 milliliter• Drip factor of the infusion dripper 60 drops/ml• Drip factor of the IV set =15, 20 drops/ml• Drip factor of the solu-set 60 drops/ml

Notes• No. of drops according to the IV set used• (X3 if iv set = 20 dr./ml & X4 if iv set = 15 dr./ml)

Your 12-year-old client is ordered Paracetamol mixture 240 mg for fever.

You have available a mixture containing 120 mg/5 ml of Paracetamol.

What volume of the mixture would you administer?

Quantity required = ? ml

Amount required = 240mg

Stock strength = 120 mg

Volume = 5 ml

Quantity required (ml)=-------240

120

X 5 = 10 ml

A patient has been diagnosed with epilepsy and has been ordered 45mg of Phenobarbitol (an anticonvulsant).

The stock medication bottle has 30mg tablets.

How many tablets will the patient receive?

Quantity required = ? tablets

Amount required = 45 mg

Stock strength = 30 mg

Quantity required (tabs)=-------45

30= 1.5 tabs

A client with pulmonary edema is ordered frusemide 80 mg IV stat. You have available ampoules containing 20 mg/2 ml frusemide.

What volume would you draw up for administration?

Quantity required (volume) = ? ml

Amount required = 80 mg

Stock strength = 20 mg

Quantity required (ml)= ----------80

20

X 2 = 8ml

Medications must diluted with WFI or other I.V fluid than inject for patient depend on injection route. Patient may will receive via IM, I.V, ….

Quantity required (volume) = ? ml

Amount required = 1.5 gm

Stock strength = 2 gm

Volume = 10 ml

Quantity required (ml)= ----------

1500

2000

X 10 = 7.5ml

Your client who has septicemia is ordered ceftriaxone 1.5 g iv stat. you have available vials containing ceftriaxone 2 g powder for reconstitution. you decide to dissolve the contents of the vial using 10 ml water for injection, and then remove the required volume.

What volume would you remove from the vial?

Quantity required (volume) = ? ml Amount required = 1.5 gmStock strength = 2 gmVolume = 10 ml

Quantity required (ml)=----------

1500

2000

X 10 = 7.5ml

1. Infusion dripper device

2. Intravenous set manually

Notes.

Such as (QID, TID, BID, OD, q12h,q8h)

Infusion pump :

Which is infused specific amount of fluid over proper time that is selected electronic from Dripper device setting

Doctor order to Start Normal saline 500 ml to be infused IV q8h using the Infusion dripper.

•Total of solution is NSS 500 ml

•Total of Time is 8X60 = 480 minutes

•Infusion dripper Drop Factor = 60

500 ml

480 min-------------- X 60 = 62.5 ml/hrml/hr =

Your client is ordered normal saline 1L to run over 16hours. How many dpm does this correspond to if a macro-drip is used?

•drop/ min = ? Drops

•Total of solution = 1L X 1000 = 1000 ml

•Total of Time = 16X 60= 960 min

•Drop factor = 20

1000 ml

960 min-------------- X 20 =drop/min= 20.8 drop/min

Such as•Dopamine

•Dobutamin

•Required ml/hr= ?ml

•Required Mic= 20 mic/kg/min

•Body weight = 75kg

•Solution = 100 ml NSS

•Concentration = 800mg

ml/hr = -------------------------------20 X 75 X60 X100 ml

800 mg X 1000= 11.25 ml/hr

Doctor order to start Dopamine 800mg in NSS to keep total volume 100 ml concentrated to be run 20/mic/kg/min patient body weight 75kg

Doctor order to start Dobutamin 1gm in 500ml NSS to be run by 10 mic/kg/min, pt body weight = 90kg

•Required ml/hr= ?ml

•Required Mic= 10 mic/kg/min

•Body weight = 90kg

•Solution = 500 ml NSS

•Concentration = 1gX1000= 1000mg

ml/hr = -------------------------------10 X 90 X 60 X 500 ml

1000 mg X 1000= 27 ml/hr

Such as:

•Nitroglycerine

•Norepenephren

Doctor order to start Tridil 50mg in 500ml NSS to be run by 10 mic/min.

•Required ml/hr= ?ml

•Required Mic= 10 mic/min

•Solution = 500 ml NSS

•Concentration = 50mg

ml/hr = -------------------------------10 X 60 X 500 ml

50mg X 1000= 6 ml/hr

Doctor order to start Norepenephren 16mg in 100ml Dextrose 5% to be run by 2.3 ml/hr

•Required ml/hr= 2.3ml

•Required Mic= ? mic/min

•Solution = 100 ml NSS

•Concentration = 16mg

2.3 = -------------------------------Mic? X 60 X 100 ml

16mg X 1000

mic = -------------------------------2.3 X 16 X 1000

60mg X 100 ml6.1 mic/min=