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pharmaceutics > Pharm Quiz 3 > Flashcards

Pharm Quiz 3 Flashcards

1
Q

epidermis

A 
1st layer
60-800 microns
eyelids - 80 microns
palms/soles - 600 microns
Contains: melanocytes (gives skin color) and langerhans cells (immune response)
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2
Q

dermis

A 
between epi and subq layers
can get blood circulation once in dermis
2-5 microns
contains the pores, sweat glands, muscles, blood vessels, nerve endings, receptors
deep dermis - pain
transdermal - minimum pain
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3
Q

sebaceous gland

A

deeper tissue under dermis

oily/waxy material

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4
Q

sweat glands

A

regulates temperature/lubricates skin

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5
Q

skin function

A

two-way barrier, prevents absorption/loss of water

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6
Q

stratum corneum

A 
upmost layer
15-25 layers, shed upwards
10-15 microns
flattened and anucleated (no nucleus) 
and top is where dead cells are
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7
Q

cell type in stratum corneum

A

corneocytes/ keratinocytes

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8
Q

composition of stratum corneum

A

protein (keratin) 40%
lipids (ceramide, cholesterol) 20%
water 40%

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9
Q

shape of stratum corneum

A

flat

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10
Q

2 functions of stratum corneum

A
  1. protect underlying skin layers

2. barrier to water loss and absorption of harmful substances

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11
Q

langerhans cells

A

diagnostics, target immune system

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12
Q

melanocytes

A

pigmenting cells in the skin

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13
Q

melanoma

A

skin cancer, uncontrolled growth of melanocytes

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14
Q

rate limiting layer

A

stratum corneum

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15
Q

transcellular is the same as ____

A

intracellular

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16
Q

trans-appendendageal is good for

A

through the pores- not uniform throughout the body

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17
Q

paracellular

A

between two cells

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18
Q

when does a drug penetrate through the skin? (6)

A
  1. hydration of SC (inc drug absorb, like wet under bandaid)
  2. thickness at different anatomical sites (epi layer)
  3. heat (also inc drug absorb)
  4. inflammation (if skin compromised)
  5. age (ceramide)
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19
Q

ceramide _____ as age increases, so absorption would ____ - WHY?

A

ceramide decreases as age increases- increases space in SC- so absorption would increase
ceramide is the main component of SC - reduced lipids

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20
Q

topical delivery

A

thin film on skin without aggressive rubbing

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21
Q

main functions of topical formulations

A
  1. skin hydration
  2. protective (or barrier) functions
  3. delivering medication into the skin
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22
Q

skin hydration topical formulation

A

use emollients/softeners as the base

emollients keeps in moisture (moisturizer)

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23
Q

protective (or barrier) functions of topical formulation

A

sunscreen, butt paste (remedy for diaper rash)

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24
Q

delivering of med to skin function of topical formulation

A

for local action

ex: antibiotics/ anti-fungals, analgesics/ steroids

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25
Q

desirable characteristics of topicals

A
  1. uniform distribution of drug
  2. no grittiness
  3. non-irritating
  4. pharmacological elegance
  5. viscosity
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26
Q

technique used to reduce grittiness/size

A

levigation/filtration

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27
Q

why viscous topicals

A

more viscous stays on longer

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28
Q

pros topical administration

A
  1. highly localized concentration of drug
  2. non-invasive
  3. easy to use
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29
Q

cons topical administration

A
  1. contact time can be limited
  2. messy/ greasy
  3. undesirable systemic absorption possible
  4. hypersensitivity
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30
Q

ointment - when and why

A

when: dry/thick scale skin
why: keep moisture in
ex: vaseline

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31
Q

cream - when and why

A

when: weeping/oozing surfaces/ open wounds
why: absorbs water

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32
Q

lotions - when and why

A

when: rubbing/ hairy surfaces
why: reduces friction

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33
Q

gels

A

when: wet oozing rashes/ poison ivy
why: drying/ soothing
ex: aloe

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34
Q

pastes

A

when: red/itchy/rubbing surfaces
why: thick/stays on longer/ can absorb secretions
ex: butt paste

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35
Q

USP categorized 4 ointment base cattegories

A
  1. oleaginous
  2. absorption
  3. water-removable
  4. water-soluble

based on occlusiveness (closes in and prevents escape), fatty, less to more water

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36
Q

methods to prepare most ointments

A
  1. incorporation - drug pulverized to reduce size using titration and blenders with slab-spatula, add small amount of insoluble drug, lipid soluble levigating agent (mineral oil) used to wet powder, drug added by geometric dilution
  2. fusion- heat to liquify, all parts melted, mixed together, heat-labile/volatile compartments at the end
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37
Q

oleaginous bases

A

“hydrocarbon bases” - longer than 25 carbon in chain length, on application to skin occlusive emollient effect, can remain on skin for a long time w/o drying out, very greasy not easily washed, cannot incorporate water

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38
Q

petrolatum, USP

A
  • purified mixture of semisolid hydrocarbons from petroleum, yellow, melts at 38-60 degrees C, used alone or combo with agents , known as yellow “petroleum jelly”
  • oleaginous base
  • petroleum jelly
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39
Q

white petrolatum, USP

A

fully or nearly discolored- bleaching
same purpose but more aesthetic then petrolatum
- oleaginous base

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40
Q

yellow ointment, USP

A

yellow wax: 50g
petrolatum: 950 g
yellow wax purified wax from a honeycomb of a bee
has a slightly greater viscosity than plain petrolatum
- oleaginous base

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41
Q

white ointment, USP

A

yellow wax is substituted with white wax (bleached and purified form)
white petrolatum
- oleaginous base

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42
Q

absorption bases

A

two types: 1. become w / o emulsion 2. are 2/o emulsions

occlusive, not as much oleaginous bases, still not easily removed by water

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43
Q

hydrophilic petrolatum, USP

A

becomes w/o emulsion base as it permits incorporation of aqueous solution, ability to absorb some fluids
does not have water in formula
cholesterol 30g, stearyl alcohol 30 g, white wax 80g, white petrolatum 860 g

44
Q

aquaphor

A

variation of hydrophilic petrolatum and can absorb up to three times its weight in water

45
Q

Already are a w/o emulsion

A

Absorption base - variation of absorption base that contains more water. Still poorly washable. Not as occlusive as oleaginous bases

46
Q

Lanolin, USP

A

Natural product obtained from wool of sheep, purified wax- like, cleaned and deodorized and decolonized, contains more than NMT 0.25% water. Additional water can be incorporated.

47
Q

Incorporating a drug into an absorption base

A
  • Either incorporation or fusion - heat
  • Use levigating agent
  • Final destination of drug/excipient should be considered when determining levigating agent
48
Q

Water soluble levigating agents

A

Glycerin, propylene glycol

49
Q

Lipid soluble levigating agents

A

Mineral oil

50
Q

Water- removable bases

A

O / w emulsions, resemble creams, external phase of emulsion is aqueous, so they wash off easily.

51
Q

Hydrophilic ointment

A

Water-removable base

52
Q

Water soluble base

A
  • no oil component
  • completely water-washable and sometime referred to as “greaseless”
  • soften with addition of water, large quantities of water cannons be added
  • used to incorporate water soluble solids
53
Q

Polyethylene glycol

A 
Ethylene oxide and water
Different grades- numerical designations
Corresponds to the avg mol wt. of the polymer used
NMT 600-clear odorless liquids
Above 1000 - waxlike white materials
In between - semisolids (600-1000)
Range from 200-8,000
54
Q

PEG Ointment, NF

A

Polyethylene glycol 3350-400g (solid)
Polyethylene glycol 200-600g (solid)
Obtain a semisolid ointment
Has water!

55
Q

Vanishing cream

A

Large % of water and stearic acid (18 chain length)

After application to skin, water evaporates and leaves a thin film of stearic acid

56
Q

Creams (uses and pros)

A

Uses: emollients or medicated
Pros: easy to apply and remove, creams can accept up to 50% water, creams are “softer” than ointments and often preferred by patients, ointments do not remove water from skin, creams can and are used to dehydrate weeping lesions

57
Q

Gel

A

Semi-solid systems consisting of drug/excipients dispersed in a jellylike aqueous vehicle consistency due to addition of gelling agent

Synthetic gelling agents
Cellulose derivatives - CMC, HPMC
Carbomers- 934/940 etc. 0.5%-2.0%
Silicone gel
Natural ingredients like tragacanth, aloe
Can be medicated if needed to contain a drug substance
Preservative added due to high water content

58
Q

Pastes

A

Contains larger portion of solid making them stiff
Used for protective action and can absorb serous secretions/discharge
- stay in place longer because they are so stiff

59
Q

Zinc oxide paste

A

25% zinc oxide
25% starch
In oleaginous base (white petrolatum)
Very firm product, protects skin and absorbs secretions

60
Q

Microbial testing for all topicals

A

For most approved dermatological products
Preservative- use when risk of infection is high

More infection when more water- white ointment versus vanishing cream - lanolin vs hydrophilic ointment

61
Q

Counter irritants

A

Acts as an irritant on painful zone, attenuated the sensation of pain
Secondary irritant to counter initial pain
Induces local inflammation to relieve inflammation in underlying or adjacent tissues

62
Q

Keratolytics

A

Removes excess retain and thin epidermis. Acts as a chemical peel/exfoliant
Improves moisture binding capacity
Ex: salicylic acid

63
Q

Astringents

A

Chemical that tends to shrink or constrict body tissues
Astringent medications cause shrinkage of mucous membranes or exposed tissues
Ex: zinc oxide

64
Q

Protectants

A

Protects skin from various factors such as moisture, air, sun, chemicals
Base witho or without active ingredient
Ex: butt past, sunscreen

65
Q

Emollients

A

Preparations that soften the skin
Usually contain fatty components such as mineral oil, petroleum, or paraffin
Reduces or retards evaporation of water
Oleaginous compounds - occlusive layer

66
Q

Antibiotics

A

Skin infections

Prevents minor skin injuries such as cuts, scrapes,and burns from becoming infected

67
Q

Fingertip method for application

A

O.5 / finger tip

68
Q

anderson cascade impactor

A

mimics drug delivery in the lungs by vacuum pump - examine the drug collected at each plate and equate the amount drug delivered to each area of the lung

69
Q

MDI

A

consists of four parts: pressurized container of drug suspension propellent, metered vale to control the dose, actuator that controls opening of spray orifice and dip tube through which drug and propellant flow (propellant not liquefiable gases or compressed gases)

70
Q

DPI

A

dry powder inhalers basically function to hold the dose of powder drug. come in multiple forms; the “disc” or the device can hold bulk or individual doses

71
Q

spacers/holding chambers

A

plastic tube that connects mouth piece of MDI to reduce amount drug deposited in the upper airway/decrease oral deposition and absorption.

72
Q

nebulizer

A

jet or ultrasonic compressor to aerosolize a solution of drug. tubing connects the compressor to the nebulizer cup that is attached to a mouthpiece

73
Q

advantage and disadvantages of MDI

A

adv: compact, multi-dose, meters dose, relatively inexpensive, low risk of contamination due to being a closed system and reproducible results
disadv: possible oral deposition of medication, limited dose size, patient drastically impacts drug delivery, limited drug stability
ex: albuterol sulfate

74
Q

DPI adv and disadv

A

adv: portable, enhanced drug stability with protein meds, no requirement of propellant, deliver bulk or individual doses
disadv: correct technique must be used, if the powder hits the throat it can trigger a cough reflex and medication is hydroscopic
ex: insulin

75
Q

nebulizer

A

adv: drug solutions offere enhanced drug stability, little patient skill required to operate device correctly, large doses admin
disadv: expensive, time consuming, contamination possibility

76
Q

afrezza

A

human insulin inhalation powder: administration mimics the early insulin response in health individuals and has a faster onset of action even rapid-acting insulin; must be used in conjunction with a long-acting insulin

77
Q

adasuve

A

loxapine- inhalation powder for the acute treatment of agitation with schizophrenia or bipolar 1 disorder in adults; one use container

78
Q

DPI vs MDI counsel

A

DPI: have to load the dose,
MDI: press down canister same time you inhale

79
Q

transdermal delivery

A

drug traveling through extracellular lipids in the gaps around cells that make up the skin - per-cutaneous route to the dermis

80
Q

PLO gel works

A

PLO- pluronic lecithin organogel. organo phase and aqueous phase in a structurally well-defined micellar network. organic phase undergoes spontaneous gelatin after incorporation with the aqueous solution

81
Q

passive transdermal delivery drug properties

A 
low dosage (<10)
low MW (<400)
moderately lipophilic
82
Q

transdermal delivery system

A

employs the skin to deliver a drug systemically by having the drug pass through the epidermis and enter the dermis

83
Q

TDS 1st generation

A

passive patches consisting of small lipophilic drugs that diffuse into the skin

  • occlusive, impermeable backing
  • adhesive to keep the patch in place
  • protective linear for storage and transport that is removed before use
84
Q

TDS 2nd generation

A

active patches that have additional enhancers such as heath activators to help speed the diffusion of the drug to the skin

85
Q

TDS 3rd generation

A

patches that employ outside forces such as micro-needles or electricity to force the drug into the stratum corneum to deliver larger molecules and less lipophilic drug molecules that oculd not be delivered otherwise- physical methods of electrical current, heat, microneedles

86
Q

Membrane-Modulated (MM)

A
  • membrane controls delivery
  • dysfunction or damage to membrane could result in dose dumping
  • small quanitity of drug is in the adhesive layer over the control membrane for a bolus dose
  • first gen*
87
Q

catapress-TTS

A

(clonidine) MM system

88
Q

matrix dispersion type systems

A

drug is dissolved or disperesed with a polymer or polymer gel such as PVP (polyvinyl pyrrolidone) or PVA (polyvinyl alcohol) upon cooling; “dot matrix delivery system”

  • prevents dose dumping
  • peripheral adhesiveness around the patch
  • first gen*
89
Q

habitrol

A

(nicotine) Matrix dispersion type system

90
Q

transderm-Scop

A

(scopolamine) MM systems

91
Q

drug-in-adhesive (DIA)

A

diffusion- controlled systems - stick with finger pressure - release liner separates DIA layer from skin; stronger adhesive than MM or matrix dispersion
acrylic polymer film liner with silicone adhesive or silicone coated film liner with acrylate adhesive

92
Q

clima pro

A

(estradiol/levongestrel) DIA

93
Q

menostar

A

(estradiol) DIA

94
Q

nicoderm CQ

A

(nicotine) DIA

95
Q

daytrana

A

(methylphenidate) DIA

96
Q

duragesic

A

(fentanyl) DIA

97
Q

release controlling membrane in MM transdermal patch

A

adhesive contains small quantity of drug to deliver a bolus dose upon application of the patch. release controlling membrane controls the rate of drug delivery.

98
Q

matrix dispersion and DIA differ from MM patches

A

matrix and DIA mechanisms prevent dose dumping. MM don’t. MM patch damaged- dose dumping. dose dispersed in polymer or adhesive in other two types of patches.

99
Q

scopolamine, nicotine, and fentanyl passive transdermal patches work

A

high conc in patch, diffuses down conc gradient from the patch into the ski. more than just the dose to be delivered into the patch. sometimes more drug will be leftover in the patch than was delivered to the skin. patches only should be worn for small period of time and disposed properly .

100
Q

how chemical enhancers/heat helps 2nd gen TDS

A

helps drug move through epidermis more quickly than from a 1st generation TDS by enhancing skin permeability

101
Q

chemical enhancers

A

DMSO: incresases soluble drug in vehicle and disrupts the protein in keratinocytes, increasing the rate of diffusion through the skin
ethanol/methanol and propylene glycol: disrupts the lipid bilayer structure, permeabilizing the stratum corneum and enhancing partitioning in the skin

102
Q

heat

A

CHADD system (controlled heat assisted drug delivery): air exposure to iron powder initiates the reaction to generate heat equivalent to 5 degrees increase in room temp

103
Q

iontophoresis

A

uses low level electric current to move charged molecules across the skin because the electrical current can be manipulated so can the rate of delivery

104
Q

ionsys

A

fentanyl iontophoretic transdermal systemic circulation over a period of 10 minutes. application of electricity to the positively charged drug in the reservoir sends the drug into the skin to the blood vessels of the dermis

105
Q

instanza

A

seasonal flu vaccine in Europe. self-admin and uses a 1.5 mm microneedle. does not penetrate the dermis so no pain is felt.

pharmaceutics (8 decks)

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