less precise than both the metric or apothecary system
not widely used except in home settings
the basic units of measurement in the household system are as follows:
drop (gtt)
teaspoon (tsp)
tablespoon (tbsp)
glass
the most common household units used in medication administration are as follows:
volume
drop (gtt), teaspoon (tsp), tablespoon (tbsp), glass
useful equivalents to know:
1 drop (gtt) = 1 minim (min)
1 teaspoon (tsp) = 60 drops (gtt) or 5 milliliters (mL) or 5 cubic centimeters (cc), or 1 dram (dr)
1 tablespoon (tbsp) = 3 teaspoons (tsp) or 15 milliliters (mL) or 15 cubic centimeters (cc)
1 glass = 240 milliliters or 240 cubic centimeters (cc) or 8 fluid ounces (fl oz)
2 glasses = 1 pint (pt)
formulas for computing medication dosages
using ratios to set up a proportion
method:
dosages are on the top line of the proportion
quantities are on the bottom line of the proportion
after the numbers are placed in the proportion, the nurse cross-multiplies to find the desired quantity
formula is:
dose on hand/quantity on hand = dose desired/X (quantity desired)
example:
Ampicillin, 625 mg PO, is ordered. It is supplied as a liquid preparation containing 250 mg in 5 mL. How much does the nurse administer?
formula:
250 mg/5 mL = 625 mg/X mL
cross multiply:
3125 = 250X
X = 12.5 mL
using a standard formula
method
the dose desired is on the top line
the dose on hand is on the bottom line
the dose desired is multiplied by the vehicle or drug form
the new dose desired is divided by the dose on hand
formula is:
dose desired/dose on hand x vehicle or drug form
example:
Ampicillin, 625 mg PO, is ordered. It is supplied as a liquid preparation containing 250 mg in 5 mL. How much does the nurse administer?
formula:
625 mg/250 mg x 5 ml
multiply 625 by 5
divide the above answer by 250
answer = 12.5 mL
The "rights" of medication administration
the five "rights"
right patient
methods for checking a patient's identity
check the name on the patient's name band
ask the patient to state his/her full name
verify the patient's identity with a staff member who knows him/her
right drug
common abbreviations used in a medication order related to the right route
cap
capsule
elix
elixir
supp
suppository
susp
suspension
tinc
tincture
right dose
common abbreviations used in a medication order related to the right dose
cc
cubic centimeter
g
gram
gr
grain
mg
milligram
ml
milliliter
oz
ounce
qs
quantity sufficient
tsp
teaspoon
tbsp
tablespoon
right route
common abbreviations used in a medication order related to the right route
IM
intramuscular
IV
intravenous
IVPB
IV piggyback
KVO
keep vein open
OD
right eye
OS
left eye
OU
both eyes
PO
by mouth
SC
subcutaneous
sl
sublingual
right time
may be given 1/2 hour prior to or after the prescribed time
common abbreviations used in a medication order related to the right time
ac
before meals
ad lib
as desired
bid
twice a day
hs
at bedtime; hour of sleep
pc
after meals
prn
as needed; whenever necessary
q
every
qd
every day
qh
every hour
q2h
every 2 hours
qid
four times a day
qod
every other day
stat
immediately
tid
three times a day
some people add the following five "rights", too
right documentation
e.g., the nurse's name, dose, route, time, date, and initials or signature
right assessment
e.g., patient's apical heart rate prior to administering digitalis, patient's serum blood sugar levels prior to administering insulin
right to education
e.g., educating the patient about the therapeutic purpose of, possible side effects of, any diet restrictions or requirements of, skill of administration of, or laboratory monitoring required by the medication
right evaluation
e.g., was the patient's pain relieved after a pain medication is administered?, did the patient's urine output increase after a diuretic was administered?
right to refuse the medication
patient's can and do refuse to take medications; however, when this happens, the nurse should:
attempt to determine the reason the patient is refusing to take the medication
reinforce the reason that the patient needs to continue to take the medication
institute reasonable measures to facilitate the patient's taking the medication
provide an explanation of the risk to the patient of his/her refusal to take the medication
document the patient's refusal to take the medication
Forms and routes for medication administration
enteral
medications administered within the intestines or alimentary canal
types of enteral medication administration
oral
most common, convenient, comfortable, safe route of medication administration
oral medication administration is contraindicated when a patient:
has difficulty swallowing
is unconscious
lacks a gag reflex
is NPO
is vomiting
types of oral medications
solid
e.g., tablet, capsule, pill
liquid
e.g., elixir, spirit, suspension, syrup
special techniques when administering oral medications
medications that are enteric-coated or sustained-release capsules should not be chewed or crushed
medications that are scored can be broken in half if a partial quantity is needed
medications that discolor the teeth or damage the enamel should be:
mixed well with water or some other liquid to dilute it
administered through a straw
followed with water after administration through the straw
medications with an objectionable taste can be make more palatable by:
allowing the patient to suck on a piece of ice prior to taking the medication to numb his/her taste buds
refrigerating and administering oily medications at cold, rather than room, temperature
placing the medication in a syringe, placing the syringe well back on the tongue, being careful not to trigger the gag reflex, and administering it slowly through the syringe
offering oral hygiene immediately after administering the medication
giving the medication with generous amounts of water or other liquids, if permitted, to dilute the taste
parenteral
medications administered outside the intestines or alimentary canal
equipment needed for parenteral injections
needle
parts of a needle
bevel
lumen
shaft
needle hilt or hub
syringe
parts of a syringe
barrel
plunger
choosing the correct needle and syringe for parenteral injections
route of administration of the medication
e.g., a longer needle is required for an intramuscular injection compared to an intradermal or subcutaneous injection
viscosity of the medication to be administered
e.g., a large-lumen needle is required for viscous medications
quantity of medication to be administered
e.g., a syringe with a greater capacity is required when a large amount of medication is to be administered
patient's body size
e.g., a longer needle is required for obese patients
type of medication to be administered
e.g., a special syringe is required for certain medications (e.g., insulin)
intradermal injection
uses
to administer diagnostic tests, such as a tuberculin test, allergy tests
effect
local
needle placement
just below the epidermis
needle angle
10 - 15 degrees
injection site(s)
lightly pigmented, thinly keratinized, and hairless skin area on the:
inner surface of the forearm
clavicular area of the upper chest
scapular area of the upper back
injection equipment needed
needle type
1 mL tuberculin syringe calibrated in tenths and hundredths of a mL
needle length
1/4 to 1/2 inch
needle gauge
26 to 27
dosage given
usually 0.5 mL or 0.5 cc or less
basic technique
wash hands
don clean gloves
cleanse area
hold skin taut
insert the needle, bevel up, at a 10 - 15 degree angle
inject the medication slowly to form a wheal (blister or bleb)
do not massage the area and instruct the patient to not massage the area
assess for reaction in 24 - 72 hours
measure the diameter of the local reaction (redness) for allergy test
measure the diameter of induration (not local reaction (redness), for a TB test
subcutaneous injections
uses
to administer non-irritating, water-soluble drugs, such as insulin, heparin, certain immunizations
effect
systemic
needle placement
in the subcutaneous tissue between the epidermis and the muscle
needle angle
45 - 90 degrees
injection site(s)
outer aspect of the upper arm
abdomen (from below the costal margin to the iliac crests)
anterior aspects of the thigh
upper back
upper ventral or dorsogluteal area of the hips
injection equipment needed
needle type
1 mL tuberculin syringe calibrated in tenths and hundredths of a mL or cc
insulin syringe calibrated in units
needle length
5/16 to 1 inch
needle gauge
25 to 30
dosage given
usually 1 mL or less
basic technique
thin person
was hands
cleanse area
bunch the skin to create a skin fold
insert the needle at a 45 degree angle
release the skin
aspirate, if recommended (except with heparin)
inject the medication
withdraw the needle
gently massage the area (except with heparin)
obese person
wash hands
cleanse the skin
insert the needle at a 90 degree angle
aspirate, if recommended (except with heparin)
inject the medication
withdraw the needle
gently massage the area (except with heparin)
intramuscular injections
uses
to administer irritating drugs, aqueous solutions, or solutions in oil
effect
systemic
needle placement
into the muscle
needle angle
90 degrees
injection site(s)
ventrogluteal
recommended for
adults and children over 7 months of age
patient position
supine, lateral
syringe type
3.0 - 5.0 mL
needle length
1 1/2 - 2.5 inches
needle gauge
20 - 23
dosage given
usually 5.0 mL or less
method for locating site
nurse places his/her palm over the patient's greater trochanter with his/her fingers facing the patient's head
the nurse's index finger is placed on the patient's anterosuperior iliac spine
the nurse's middle finger extends dorsally palpating the crest of the patient's ileum
forms a triangle
the nurse makes the injection in the center of the triangle
advantages
relatively free of major nerves and vascular branches
well defined by bony landmarks
thinner layer of fat than the dorsogluteal site
sufficient muscle mass for deep IM or Z-track injections
readily accessible from several patient positions
disadvantages
should a hypersensitivity reaction occur, tourniquet cannot be applied to delay absorption
health professional's unfamiliarity with site
vastus lateralis
recommended for
children younger than 7 months
patient position
supine, sitting
syringe type
3.0 mL
needle length
5/8 - 1 inch
needle gauge
22 - 25 guage
dosage given
usually 1.0 mL or less (infants)
usually 2.0 mL or less (pediatric)
method for locating site
the nurse divides the patient's thigh into thirds horizontally and vertically
the nurse makes the injection in the outer middle third of the patient's thigh
advantages
relatively large muscle mass at birth
suitable site for infants
area of sufficient size for several injections
free of major nerves and vascular branches
disadvantages
use of a long needle relative to small extremity size may reach sciatic nerve or femoral vascular structures if improper technique is used
deltoid muscle
recommended for
adults
patient position
sitting, prone, supine, lateral
syringe type
3.0 mL
needle length
5/8 - 1 1/2
needle gauge
23 - 25
dosage given
usually 1.0 mL or less
method for locating site
method one
the nurse palpates the lower edge of the patient's acromion process and the midpoint on the lateral aspect of the patient's arm that is in line with his/her axilla
forms a triangle
the nurse makes the injection in the center of the triangle
method two
the nurse places four fingers across the patient's deltoid muscle with his/her first finger on the patient's acromion process
the nurse makes the injection three finger breadths below the patient's acromion process
advantages
easily accessible
general acceptable by patient
in hypersensitivity reaction, tourniquet may be applied above the injection site
disadvantages
small muscle mass relative to other sites
close proximity to nerves and vascular structures
small margin of safety with any deviation from site
not suitable for repeated or large-volume injections
dorsogluteal
recommended for
adults and children greater than 3 years of age
patient position
prone
syringe type
3.0 mL
needle length
1.25 - 3
needle gauge
18 - 23
dosage given
usually 3.0 mL or less
method for locating site
the nurse locates the patient's posterosuperior iliac spine and greater trochanter
the nurse draws an imaginary line between the above
the nurse makes the injection lateral and slightly superior to the midpoint of the imaginary line
advantages
large muscle mass accommodates deep IM or Z-track injections
injection is not visible to the patient
disadvantages
boundaries of the upper outer quadrant are arbitrarily selected and may exceed margin of safety
danger of injury to major nerves and vascular structures if incorrect site or technique
fat is often very thick and an injection intended for the muscle may be subcutaneous
if a hypersensitivity reaction occurs, a tourniquet cannot be used
difficult to maintain asepsis
technique
basic
wash hands
don clean gloves
cleanse the skin
insert the needle at a 90 degree angle
aspirate
inject the medication
withdraw the needle
gently massage the area
z-track (prevents medication from seeping back into the subcutaneous tissue)
wash hands
draw up the medication
replace the first needle with a second needle
don clean gloves
cleanse the skin
pull the skin to the side and hold
insert the needle at a 90 degree angle
holding the skin to the side, inject the medication
withdraw the needle
release the skin
intravenous (future lecture)
action
site
equipment
technique
topical
medications administered to the skin, cornea, or mucous membranes of the eye, mouth, oropharynx, nose, rectum, or vagina
types of topical medication administration
transdermal
administration of a medication through the skin where it is absorbed
basic technique
transdermal patch
wash hands
don clean gloves
remove old patch and dispose
assess skin area where old patch was removed for irritation
apply new patch at the same time of day
write the date and time on the new patch
buccal
administration of a medication by placing it against the mucous membrane of the cheek where it dissolves and is absorbed
basic technique
place the medication against the patient's right or left cheek
instruct the patient not to swallow the medication
instruct the patient to let the medication remain in place until it is fully dissolved and absorbed
instruct the patient to not eat any food or drink any fluids while the medication is in place
sublinqual
administration of a medication by placing it under the tongue where it dissolves and is absorbed
basic technique
place the medication under the patient's tongue
instruct the patient not to swallow the medication
instruct the patient to let the medication remain in place until it is fully dissolved and absorbed
instruct the patient to not eat any food or drink any fluids while the medication is in place
installations
administration of a medication into a body cavity or orifice such as the eye, ear, nose, rectum, or vagina
types of installations
optic
medications administered into the lower conjunctival sac of the eye(s)
basic technique
optic drops
wash hands
don clean gloves
clean the patient's affected eye with sterile cotton balls moistened with sterile normal saline by wiping from the inner to outer canthus
position the patient
if the patient is sitting up, instruct him/her to tilt his/her head back and look up toward the ceiling
if the patient is lying down, place his/her head over a pillow and look up toward the ceiling
evert the medication bottle so that the tip of the bottle faces down about 1/2 - 3/4 inches above the patient's affected eye being careful not to touch the eyelid, eyelashes, or eyeball with the tip of the bottle
gently draw the skin down below the patient's affected eye to expose the lower conjunctival sac
gently instill the correct number of drops onto the outer third of the lower conjunctival sac of the patient's affected eye
gently apply pressure over the inner canthus of the patient's affected eye to prevent the drops from flowing into the tear duct
optic ointment
wash hands
don clean gloves
clean the patient's affected eye with sterile cotton balls moistened with sterile normal saline by wiping from the inner to outer canthus
position the patient
if the patient is sitting up, instruct him/her to tilt his/her head back and look up toward the ceiling
if the patient is lying down, place his/her head over a pillow and look up toward the ceiling
evert the tube so that the tip of the tube faces down about 1/2 - 3/4 inches above the patient's affected eye being careful not to touch the eyelid, eyelashes, or eyeball with the tip of the tube
gently draw the skin down below the patient's affected eye to expose the lower conjunctival sac
gently squeeze about a 1/2 inch strip of ointment from the tube along the exposed lower conjunctival sac
instruct the patient to close his/her eyes for 2 - 3 minutes
instruct the patient to move his/her affected eye underneath his/her closed eyelid to spread the ointment under the eyelid and over the surface of the eyeball
instruct the patient that he/she can expect blurred vision for a short time
otic
medications administered into the auditory canal
basic technique
wash hands
don clean gloves
warm the medication bottle to room temperature
if necessary, clean the patient's affected ear with sterile cotton balls moistened with sterile normal saline
position the patient
if the patient is sitting up, instruct him/her to tilt his/her head to the side with his/her affected ear facing up toward the ceiling
if the patient is lying down, instruct the patient to turn onto his/her side with his/her affected ear facing up toward the ceiling
draw up the correct amount of solution into the dropper
straighten the auditory canal of the patient's affected ear
pull the pinna up and back (if adult)
pull the pinna down and back (if an infant or child under 3)
hold the dropper so that the tip faces down about 1/2 - 3/4 inches above the auditory canal of the patient's affected ear
gently instill the correct number of drops from the dropper alongside the the side of the auditory canal of the patient's affected ear
gently press on the tragus of the patient's affected ear a few times
if ordered, loosely insert a cotton ball into the patient's affected ear to prevent the medication from leaking out
instruct the patient to remain in a sitting or side-lying position with his/her ear facing up toward the ceiling for 5 minutes
nasal
medications administered into the nasal cavity
basic technique
wash hands
don clean gloves
provide the patient with paper tissues and instruct him/her to blow his/her nose prior to instilling the nose drops
position the patient
if the patient is sitting up, instruct him/her to tilt his/her head back with his/her nose facing up toward the ceiling
if the patient is lying down, place a pillow under his/her shoulders and allow his/her head to fall over the edge of the pillows his/her nose is facing up toward the ceiling
draw up the correct amount of solution into the dropper
hold the tip the patient's affected naris
evert the dropper so that the tip of the dropper faces down
place the tip of the dropper just inside the patient's affected naris
gently instill the correct number of drops from the dropper into the patient's affected naris
instruct the patient to remain in a sitting position with his/her nose facing up toward the ceiling or a lying position with a pillow under his/her shoulders, allowing his/her head to fall over the edge of the pillow, with his/her nose facing up toward the ceiling for 5 minutes
inhalation
administration of medications into the lungs
basic technique
metered-dose inhaler without spacer
remove the mouthpiece cover from the inhaler
shake the inhaler well
instruct the patient to take a deep breath and exhale
instruct the patient to open his/her mouth wide
instruct the patient to hold the inhaler 1 - 2 inches from his/her open mouth
instruct the patient to inhale slowly and deeply through his/her mouth
instruct the patient to press down on the medication canister while continuing to inhale through his/her mouth
instruct the patient to hold his/her breath for 5 - 10 seconds or as long as possible
instruct the patient to wait 1 - 5 minutes before administering a second dose
metered-dose inhaler with spacer
remove the mouthpiece cover from the inhaler
shake the inhaler well
attach spacer to mouthpiece of inhaler
instruct the patient to take a deep breath and exhale
instruct the patient to grasp the mouthpiece of the spacer securely with his/her teeth and lips
instruct the patient to inhale slowly and deeply through his/her mouth
instruct the patient to press down on the medication canister while continuing to inhale through his/her mouth
instruct the patient to hold his/her breath for 5 - 10 seconds or as long as possible
instruct the patient to wait 1 - 5 minutes before administering a second dose
suppositories
rectal
installations through the anus and into the rectum
basic technique
wash hands
don clean gloves
position patient on his/her left side
remove foil around suppository
lubricate suppository (if desired)
instruct the patient to breathe through his/her mouth to relax the internal and external anal spinchters
separate the patient's buttocks
gently insert the uppository, rounded end first, beyond the internal anal spinchter
if stool is present, do not embed the suppository in the sool, but place it between the stool and rectal mucosa
instruct the patient to remain on his/her left side
5 minutes (if non-laxative)
35 - 45 minutes (if laxative)
vaginal
administration of medication through the introitus and into the vagina
basic technique
wash hands
don clean gloves
position patient in a lithotomy position
remove foil around suppository
lubricate suppository (if desired)
spread the patient's labia with your fingers
clean the patient's vaginal orifice with cotton balls and warm water using a single stroke moving from the above the orifice down toward the sacrum
gently insert the suppository, rounded end first, through the introitus well into the vagina for its full length
instruct the patient to remain in a supine position for 5 - 10 minutes
provide the patient with a perineal pad to collect drainage