Exam 3 dermatological therapeutics Flashcards
What is drug delivery dependent on?
Skin type, skin condition, lipid vs. water-based vehicle, charge, concentration gradient
What is the rate limiting step of topical therapy absorption?
The stratum corneum
What increases absorption of topical treatments through the skin?
Hydration of the skin
What are the actions of corticosteroids?
Anti-inflammatory, immunosuppressive, anti-proliferative, vasoconstrictive
What can corticosteroids be used for?
eczema, contact dermatitis, psoriasis, itch, lichen planus
What are adverse side effects of corticosteroids
Skin atrophy (thinning), striae, acne, suppression of the HPA (hypothalamus, pituitary, adrenal) axis
Explain the levels of corticosteroid strength
1 is for very thick skin, 7 is for very thin skin and babies
What are retinoids in terms of their background?
vitamin A analoges
How do retinoids work?
working through nuclear receptors on DNA causing alteration of gene transcription
What is the action of retinoids?
regulate cell growth, inhibit carcinogenesis, alter enzymes involved with cellular differentiation
What can retinoids be used for?
acne, psoriasis, cosmetic skin improvement (reduction of fine wrinkles and pigmentation)
What are the side effects of retinoids?
dryness, irritation, sun sensitivity
What is calcipotriene
Vitamin D analog that acts through DNA receptors to alter skin differentiation
What are the uses for calcipotriene
psoriasis (localized), eczema
What are side effects of calcipotriene?
irritation, increased serum calcium
What are topical antimicrobials used for?
wounds, acne, fungal infections, rosacea
What do non-steroidal anti-inflammatories (topical calcinuerin inhibitors) work through?
calcineurin to alter T-cell activation
What are the uses for non-steroidal anti-inflammatories (topical calcinuerin inhibitors)
Eczema around the eyes, dermatitis
What sun rays are the best to block for sunscreen?
UVA and UVB
What new sunscreens help to block UVA rays?
avobenzone/helioplex or mexoryl
What is so special about titanium and zinc oxide for blocking sun rays?
they stay on the skin and do not get absorbed so they block longer
How does Imiquimod/aldara cream work?
increase local immune activity through toll receptors
What is imiquimod used for?
condyloma, actinic keratosis, BCC, common warts, molluscum, in situ cancer
what can topical 5-fluorouracil be used for?
actinic damaged skin cells; actinic keratosis,
How does 5-flourouracil work?
inhibits thymidylate synthase resulting is reduced DNA synthesis
How do systemic retinoids work?
by repairing disordered keratinization
What can systemic retinoids be used for?
acne, psoriasis, ichthyosis, Darier’s disease, chemoprophylaxis of skin cancer
What are two systemic retinoids?
isotretinoin, acitretin