EXAM 1 Intro to Derm Products Flashcards
Drugs applied to skin can be for:
Local disease
Systemic disease
Non-drug therapies can be used as ________
adjuncts
determinant of pharmacologic response
- permeability and penetration
- concentration gradient
- dosing
- vehicle
- occlusion
permeability: greater for hydrated or dehydrate, flaky scaly
hydrated skin
permeability: greater for thick or thin skin
thin skin
permeability: greater for face, scrotum, axilla, scalp or arm, back thigh
face, scrotum, axilla, scalp
permeability: foot, leg, hand or arm, back, thigh
arm, back, thigh
permeability: cut, scratch, shave or no trauma
cut, scratch, shave
greater concentration = greater or lower amount per unit time
greater
____ may exist: ____ concentration necessary for effect
Threshold may exist: minimum concentration necessary for effect
things that affect dosing
- time left on skin
- frequency
- quantity/area
- dermis: barrier or reservoir
carrying agent that may have therapeutic effects itself and maximizes efficacy
vehicle
physical properties of vehicles
- Scalp/Hairy Areas: tincture, lotion, gel, foam, aerosols, shampoo
- Lubricant: ointment, some creams
- Drying Effect: tincture, lotions & creams
- Direct application or covering of an agent
- Maximizes efficacy
- Increases absorption and decreases evaporation
- Protection
occlusion
goals of wet lesions
we want to dry them
goal of dry lesions
we want to wet them
way to dry/wet lesions
- Think base/vehicle
- Adjuncts to topical application
- Timing of different bases
drug particle contained within vehicle/base
emulsions
Most common vehicle
Most are oil-in-water
creams
Commonly used, especially for chronic lesions
Good for dry lesions due to occlusive properties
ointments
Solutions of powder in water
lotions
Clear, nongreasy, nonstaining, nonocclusive, quick drying (bc have a lot of alcohol that quickly evaporates)
gels
Evaporate quickly to cause drying
Often only dosage form for acute wounds that are weeping/oozing
solutions
2 major classes:
- oil-in-water
- water-in-oil (more oil=more viscosity)
available in liquid and semi-solid forms
emulsions
Application – rub in until vanishes (Pt education)
Doesn’t leave much residue
No occlusion
creams
Not good for intertriginous areas due to maceration
Can be cosmetically unpleasing
ointments
Good for tender areas because need less effort to apply
lotions
Provide cooling and drying
Good for large areas
lotions
Good for visible areas because no residue
gels
Can sting on application and be drying
gels
Can be applied as dressing or patient can soak in the solution
Can be added to bath for large application
solutions