Dose Form exam III

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ba
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116744
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Dose Form exam III
Updated:
2011-11-15 12:59:43
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Transdermal
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Transdermal Slides, definitions
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  1. What is percutaneous absorption?
    Absorption of substances from outside of the skin to underneith the skin and into the blood stream
  2. What are the factors influencing percutaneous absorption?
    • Physical and chemical properties
    • Pharmaceutical vehicle
    • Condition of the skin
  3. What is the major rate limiting barrier to transdermal drug transport?
    Stratum Corneum (Horny Layer)
  4. WHat is the stratum corneum?
    The outer layer of the skin that is composed of partially desiccated non-living cells + film (sebum and sweat) and karatin.
  5. What layer of the skin is not significant in drug penetration?
    The stratum corneum
  6. What is the layer of skin where the barrier layer with living cells at several differentiated levels?
    Stratum lucidum
  7. What is the living epithelium?
    Stratum Lucidum
  8. What is the layer of skin that is the living epidermis?
    Statum Germinativum
  9. What is the layer of skin that has basal layers separating from dermis?
    Stratum Germinativum
  10. What is the layer of skin that has vascularized tissue that drug must reach?
    Dermis
  11. What is transcellular?
    Non-polar drugs that tend to cross cell barrier through lipid rich regions
  12. What is intracellular?
    • Medication that can diffuse through the space between cells
    • Channels are the major route of drug penetration
    • Polar drugs
  13. What is trans-appendageal ?
    • Accross the skin appendages
    • hair follicles
    • Sweat Glands
    • Sebaceous glands
    • Minor drug absorption
  14. What are the factors relating the drug that affect absorption through the skin?
    • Concentration of drug
    • Particle size
    • Molecular weight
    • Solubility in both oil and water
    • Attraction to skin
  15. What the factors relating to the vehicle that affect absorption through the skin?
    • Adherence to skin
    • Miscibility with sebum
    • Action as a moisture barrier (hydration of skin)
  16. What are the factors relating to the skin that affect absorption through the skin?
    • Intact or broken skin
    • Surface area applied
    • Site of application (thin horny)
  17. What are the factors relating to the physical factors that affect absorption through the skin?
    • Rubbing (inunction)
    • Exercise = vasodilation
    • Time of contact with skin
    • Mutiple applications (saturation)
  18. What are the chemical methods of enhancing percutaneous absorption?
    • Reduction of S. Corneum resistance
    • Modification of S. Corneum hydration
    • Modification of lipids in intracellular channels
    • through carrier mechanism
  19. What are the solvent, chemical percutaneous enhancers?
    • Water
    • Alcohol
    • Alkyl methyl sulfoxides
    • Pyrrolidones
    • Laurocapram
    • Micellaneous: acetone, dimethyl acetamide, dimethyl formamide
  20. What are the amphiphies, chemical enhancers?
    • Anionic surfactant
    • Cationic surfactant
    • Amphoteric surfactant
    • Nonionic surfactant
    • Fatty Acid and alcohol
  21. What are examples of anionic surfactant?
    • Docusate sodium
    • SDS
  22. What are examples cationic surfactant?
    Quaternary ammonium salts, preservative
  23. What are examples of amphoteric surfactant?
    • Lecithins
    • Cephalins
    • Alkyl betamines
  24. What are examples of nonionic surfactant?
    Mon, di and triglycerides
  25. What are examples of fatty acids and alcohol for chemical percutaneous enhancer?
    • Lauryl
    • Cetyl
    • Stearyl Alcohol
    • Sorbitan
    • PEG
  26. What are the physical methods of enhancers?
    • Ionophoresis
    • Sonophoresis
  27. What is ionophoresis?
    Delivers a charged chemicals across the skin using eletrical field
  28. What is sonophoresis?
    High-frequency ultrasound facilitates drug penetration through S. Corneum
  29. What are rate controlling systems intended to do?
    • POPICOC
    • The drug is release promptly from the system into the S. Corneum for penetration into general circulation
    • Systemic Affect
    • Cause occlusion of the skin so there is only one way flux of drug, which is a therapuetic advantage over other dosage forms (nothing is loss)
    • Design must avoid proliferation of bacteria under occluded skin
    • Cause no irritation or sensitization to the skin due to drug, vehicle or adhesive
    • Deliver drug at a controlled rate to intact skin without building up in the dermis layer
    • Skin is not the targe
    • Increase patient compliance
  30. What are the advantages of TDDS?
    • Avoid the GI
    • Substitute for oral administration, and parental
    • Avoid first pass effect
    • Provide mult-day therapy with single patch
    • Drug effect terminated when the patch is taking off
    • Fast identification of patch during emergencies
  31. What are the disadvantages of TDDS?
    • Can be put on irritating skin
    • Only can use potent drugs
    • Technical difficulties

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