0.35 g = 350 mg

OR multiply 0.35 g × 1000 = 350 mg

1 g = 1000 mg

1 mg = 0.001 g or 1/1000 g

1 kl = 1000 liters

1 liter = 1000 mL

1 mL = 0.0001 liter or 1/1000 liter

As in the metric system, these two units are related; the grain is based on the weight of a single grain of wheat, and the minim is the volume of water that weighs 1 gr

Either symbols or abbreviations are used; for example, 1½ drams might be written Diss or dr 1½ (p. 664)

1 gtt = 1 M

60 gtt = 1 tsp (5 ml)

3 tsp = 1 Tbsp (tablespoon) (15 ml)

2 Tbsp = 1 oz (30 ml)

8 oz = 1 cup (240 ml)

You must convert the ordered unit of measurement (grains) to match the unit of measurement on the drug label (grams)

Drug have: unit of measurement that is on the label

Wanted: amount or strength ordered by physician

Have: conversion (15 gr = 1 g)

1 g (label) × 30 gr (physician order) / 15 gr (conversion factor) = 2 g = 2 tabs

“Available strength” /”Ordered strength” = “Available amount” /”Amount to give”

D: desired dose (the physician’s order)

H: what is on hand (the dosage strength listed on the medication label)

Q: quantity in the unit (identified on the label as one tablet, 5 mL, etc.)

(D/H) × Q

Factors used in calculating pediatric doses are either body surface area or weight

This rule is based on the weight of the child

This system is much more accurate, because children of any age can vary greatly in size and body weight

Pediatric dose = (Child’s weight in pounds/150 lb) × Adult dose (Adult doses are based on average adult weight of 150 lb)

Pediatric dose = (BSA of child in m2 / 1.7 m2) × Adult dose

Convert the weight to kilograms by dividing number of pounds by 2.2 kg

Calculate the total daily dose of the medication

Calculate a single dose of drug based on how frequently the medication is ordered throughout the day

After calculating amount of a single dose, compare the ordered amount to drug label

This forms a solution

Must be made before injection

Read label directions carefully

Responsible for his/her own actions

Know state laws before administering medications