Drug delivery calc

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conversions and equations

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32 Terms

1
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1 teaspoon to fluid ounce

is equivalent to 1/6 of a fluid ounce

2
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1 teaspoon to mL

is equivalent to 4.92892 mL

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1 tablespoon to fluid ounce

is equivalent to 1/2 of a fluid ounce

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Calculate number of dose

Number of dose = (total quantity)/ (Size of dose)

5
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1 tablespoon to mL

is equivalent to approximately 15 mL.

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1 pint to mL

is equivalent to approximately 473 mL.

7
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1 gram to mg

is equivalent to 1000 mg.

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0.020 g to mg 

is equivalent to 20 mg.

9
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ug to mg

is equivalent to 0.001 mg.

10
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50 ug to mg

is equivalent to 0.05 mg.

11
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Calculate size of dose

Size of dose = (Total quantity) / (Number of doses)

12
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Compliance rate

% compliance rate = ((number of days supply) /(number of days since last rx refill)) x 100

13
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Density equation

Density = (mass) / (volume)

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Specific gravity 

Specific gravity = (weight of substance) / (weight of equal volume of water)

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52.78 mL in g

52.78 g

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Drug needed

prescription

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Factor

LWQ / Drug needed

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Drug weighed

Drug needed x factor 

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Total Mixture

Drug weighed + Dilluent weighed

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Diluent weighed

Total Mixture - Drug weighed

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Aliquot portion

1/ factor 

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Percent error

(Error x 100%) / (Quantity desired)

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1 lb to grams

454 grams

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1 ounce to gram

28.35 grams

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1 kg to lb

2.2 pounds

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1 inch to cm

2.54 centimeters

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Iron required mg

Body weight (lb) x 0.3 x [100 - ((Hb (g/dL) x 100) / 14.8 g/dL)]

28
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Crockcraft-Gault equaltion

CrCl = ((140 - patient’s age in years) x pt. wt. kg) / 72 x serum creatine in mg/dL

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Difference in CrCl equation for female

multiple by 0.85

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Calculate pH for acid

pH = pka + log (salt/acid)

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Calculate pH for base

pH = pKa + log (base/salt)

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Calculate pH change with pKb

pH = pkw - pKb + log (base/salt)