MN 552 QUIZ, MIDTERM EXAM AND FINAL EXAM WITH CORRECT ANSWERS
What is Modified Release? Correct Answer: The term modified-release is used to describe dosage forms that alter the timing and/or the rate of release of a conventional drug product/dosage form
- FDA does define this
Some Modified ...
MN 552 QUIZ, MIDTERM EXAM AND FINAL EXAM WITH CORRECT ANSWERS
What is Modified Release? Correct Answer: The term modified-release is used to describe dosage forms that alter the timing and/or the rate of release of a conventional drug product/dosage form
- FDA does define this
Some Modified Release Systems Correct Answer: - some of these have overlap 1. Delayed release
2. Repeated Release or Repeat Action
4. Extended, Sustained, Long-Acting, Prolonged, Controlled Release 5. Targeted Release
Delayed-release Correct Answer: - dosage forms release the drug at a later time than an immediate dose system
- Delayed-release can include enteric-coated tablets, where timed release is achieved by a barrier coating
- takes more time to release drug; doesn't start dissolving until a certain point of time
Repeat-release Correct Answer: - multiple doses of immediate release drug units with intermittent dosing
- Such as repeat-action tablets and capsules
Extended, Sustained, Long-Acting, Prolonged, Controlled Release Correct Answer: - Extended, Sustained-release systems slowly release the drug over an extended period of time
- Rate and duration are not always designed to a particular profile
- If the system can maintain predictable levels of drug in the target tissue or cells, it is considered controlled- release. (Examples: XL,SR,CR) - Controlled release systems are also called extended or sustained (prolonged) release - dissolves and continues dissolving for a longer time
Targeted Release Correct Answer: - Site-specific or targeting refers to concentrated drug release at a certain site such as a tissue, organ, receptor, or cell - A form of controlled release
- very difficult to achieve - trying to control distribution of drug to target area
What is Controlled Release? Correct Answer: - Controlled Drug Delivery attempts to deliver the precise amount of a therapeutic agent (drug), to a specific site (site of action), for a specific time (duraterm-5tion of treatment) - OR Achieve both spatial (targeted) and/or temporal "control" of the drug
- a lot of prediction involved, very precise, and targeted - The Drug Delivery System attempts to control the drug concentration at the target tissue
Disadvantages of Conventional Delivery Correct Answer: - Inconvenient because pt can
forget to take dose
- Difficult to monitor - Overdosing possible
- Large amounts of drug can be "lost" when it does not get to the target organ because has to distribute to the whole body
- Drug goes to non-target cells and can cause damage
- Expensive (using more drug than necessary)
The Goal of Modified Drug Delivery Correct Answer: To Alter and Control
- Absorption - Distribution - includes Cellular Uptake - Metabolism (reduce it so more drug available) - Elimination (reduce how fast eliminated to prolong effect of drug) - Toxicity (reduce it) What is Sustained Drug Action? Correct Answer: - ideal dosage form
- pt only has to take one time rather than multiple times
- minimize side effects by delivering API to site of action (target receptors, cells, tissues,
or area in the body) - re-patenting without new drug development.
Improving Patient Compliance Correct Answer: Minimize Plasma fluctuation
- Plasma Concentration vs Time
- Sustained Release: takes longer to be absorbed and in therapeutic range for longer but eventually eliminated
- Controlled: absorbed quickly and in therapeutic range for as long as necessary - the more times you have take a medication day, the lower pt compliance
Tries to Achieve: Site Specific Drug Delivery Correct Answer: Reduction of side effects
- Anticancer drugs
--> Cytosine arabinoside- Dpocyt®
- Anti-fertility Agents - Anti-inflammatory drugs
Site Specific Drug Action or Drug Targeting Correct Answer: - Targeting or Spatial Delivery
- exclusive drug delivery to specific organ, tissues, or cell types
- Still in development and difficult
- Designed to be directed to a specific organ, tissues, cell or cell compartment
- Targets include surface or compartment cell markers, proteins or even nucleic acids
- can locally put the drug through patches
Routes of Administration Correct Answer: a. Parenteral - Refers to injections and IV - Fast Absorption
- No First pass
- Painful
- Inconvenient
b. Transdermal - Easy access
- Large surface area
- Avoid first pass metabolism
- Avoid GI incompatibility of drugs
- Good patient compliance
- Slow absorption
- Transport across skin can be a challenge
- Need lipophilic
- Low MW drugs
c. Ocular - Localized delivery for eye disorders
- Good absorption for many drugs
- Bypasses certain clearance routes
- Problems with loss of drug in tears
d. Nasal - Easy administration
- Local delivery of drugs
- Rapid absorption
- Can bypasses certain clearance routes
e. Pulmonary - Rapid absorption
- Large surface area for absorption
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