WorksheetsCEUTICS 3 EXAM 2 DRUG STABILITY MIRINOSHKY
Total questions: 52
Worksheet time: 4hrs 4mins
Which of the following characteristics will ensure the integrity and reliability of the drug? Select all that apply
Identity
Strength
Surface tension
Compressibility
Which of the following characteristics mainly focus on safety of the product?
Identity
Strength
Purity
Compressibility
Is defined as the time lapse during which the drug product retains, within specified limits, the same properties and characteristics that it possessed at the time of manufacture (t=0)
Tortuosity
Stability
Compressibility
Porosity
Which of the following excipients that may be critical in terms of drug product stability? Select all that apply
Ammonia
Preservatives (antioxidants)
Buffers
Bulking agents
Which of the following maintain the pH at the desire level that will ensure chemical and physical stability of an active ingredient within a dosage form?
Antioxidants
Preservatives
Buffers
Bulking agents
Which of the following show dependence of the buffering capacity on the temperature, it may alter the buffer capacity and therefore impact the stability (Hygroscopicity)?
Preservatives
Bulking agents
Buffer
Which of the following are causes of Instability according to USP-NF? Select all that apply
Physical
Chemical
Microbiological
Therapeutic
Toxicological
Which of the following are the causes of physical instability? Select all that apply
Polymorphic/solid-phase transformations,
Complexation
Vaporization
Adsorption
Eutectic formation
Hygroscopicity
Which of the following are the causes of chemical instability? Select all that apply
Hydrolysis
Oxidation
Polymerization
Decarboxylation
Deamination
Which drugs classes are affected in the process in which chemicals interact with water molecules yielding reaction products? Select all that apply
esters
lactones
lactams
amines
Hydrolysis is catalyzed by acids and bases => pH effect
True
False
Which of the following statements are TRUE about, How Hydrolysis can be prevented? Select all that apply
To formulate the drug in a dry powder form to be reconstituted before administration
To eliminate or reduce water from the formulation
To apply a waterproof coating
Add buffering agents to control pH
Select appropriate storage conditions (e.g., refrigerator)
The loss of electrons from one molecule and the receipt of electrons by another molecule.
Hydrolysis
Oxidation
Which of the following is accelerated by oxygen, light and moisture and we can see signs of change in color, precipitation or odor?
Hydrolysis
Oxidation
Which drugs classes are affected within the loss of electrons from one molecule and the receipt of electrons by another molecule? Select all that apply
aldehydes
alkaloids
alcohols/phenols/sugars
unsaturated fats and oils
lactones
Which of the following statements is TRUE if we want to avoid oxidation? Select all that apply
Add buffering agents to control pH
reduce water from formulation
add antioxidants
by adding ascorbic acid,
sodium sulfite,
a-tocoferol
to apply a waterproof coating
Which of the following excipients can be added in pharmaceutical formulations to prevent oxidation ? Select all that apply
sodium sulfite
ascorbic acid
a-tocoferol
add water
Ability to retain sterility or resistance to microbiological growth
Hydrolysis
Oxidation
Microbiological
Which of the following titles provide the acceptable total aerobic microbial count and total combined yeast and molds count?
USP-NF {158} Microbiological Examination of Sterile Products
USP-NF {111} Microbiological Examination of Nonsterile Products
Which of the following are considered sources of Microbiological contamination resulting because poor aseptic techniques? Select all that apply
Air
Water
Raw materials
Personnel
Which of the following are TRUE of how can we prevent microbiological instability? Select all that apply
Using Benzoic acid
Often associated with a process failure => reassess GMP/GLP
Using Parabens
Using Benzalkonium Chloride
Using antimicrobial preservatives
Most water based formulations WILL REQUIRE an addition of an antimicrobial preservative to maintain microbiological stability of the drug product.
True
False
Which of the following describes the stability of drug formulations at specified storage conditions (light, temperature, humidity)?
shelf life
peak time
long half life
therapeutic index
Which of the following is a TRUE statement regarding SHELF LIFE as a kinetic parameter?
10% of API remains unchanged AND 90% of API degraded by this time
90% of API remains unchanged AND 10% of API degraded by this time
50% of API remains unchanged AND 50% of API degraded by this time
9% of API remains unchanged AND 91% of API degraded by this time
Know this (time has been setup for 10 minutes to memorize)
Yes
No
Expiration date and shelf life are always link to which of the following?
tortuosity of matrix
specific storage conditions (light, temperature, humidity)
porosity the formulation has
60 days after the product has expired, it can be still used
Which of the following statements is TRUE about Controlled room temperature?
maintained thermostatically usual and customary working environment of 20 C to 25°C with a permissible deviation between 30°C and 40°C
maintained thermostatically usual and customary working environment of 2 C to 8°C with a permissible deviation between 30°C and 40°C
maintained thermostatically usual and customary working environment of 20 C to 25°C with a permissible deviation between 15°C and 30 °C
maintained thermostatically usual and customary working environment of 2 C to 8°C with a permissible deviation between 8°C and 15 °C
Which of the following climate zones is represented in ZONE 1?
Mediterranean (21.6°C & 52% RH)
Temperate (20°C & 42% RH)
Which of the following climate zones is represented in ZONE 2?
Temperate (20°C & 42% RH)
Mediterranean (21.6°C & 52% RH)
Which of the following is TRUE about the Accelerated stability testing which is run 40 C and has a higher humidity of 75%?
cover period for 12 months
cover period for 6 months
ICH - International Conference on Harmonization of Technical Requirements for the Registration of Pharmaceuticals for Human Use regulates the stability testing.
True
False
Know this
Yes
No
Which of the following are TRUE about Accelerated Stability Testing? Select all that apply
12 months covered by data submission
6 months covered by data submission
The reaction rates (k) are obtained by plotting the drug concentration vs time
Samples are stored at elevated temperatures
The Arrhenius Eq. is used to predict the stability at room temperature
The rate constant for degradation at RT is obtained by which of the following?
florification
extrapolation
exploration
translocation
Know how to calculate this
Yes
No
Which of the following is independent of reaction order and estimates the shelf-life at a new temperature when the shelf life at an original temperature is known?
K
Q10
A
R
Remember the most used values for Q are 2,3,4.
Yes
No
An antibiotic solution has a shelf life of 48 hours in the refrigerator (5°C). What is its estimated shelf-life at room temperature (25°C)? Round to tenth decimal
5.3
8.33
8.3
9.3
Calculate the shelf life (t90) of the following drug? No units
(a)
For a first-order reaction, the initial concentration of a drug is 120 mg/mL. The specific rate constant k is obtained from an Arrhenius plot and is equal to 2 × 10−5 h−1 at 25°C (77°F). What is the shelf-life of this product? Express value only in days
(a)
An antibiotic solution has a shelf life of 24 hours at room temperature (25C). What is its estimated shelf life in the refrigerator (5C)? Solve assuming that the Q10 = 2. Express value with units (hours)
(a)
The Q10 approach is independent of reaction order and estimates the shelf-life at a new temperature when the shelf life at an original temperature is known.
True
False
The Q10 approach is dependent of reaction order and estimates the shelf-life at a new temperature when the shelf life at an original temperature is known.
True
False
For every 10 °C increase in temperature the reaction rate doubles.
True
False
For every 20 °C increase in temperature the reaction rate doubles.
True
False
The Arrhenius Equation shows that the rate increases exponentially as temperature rises.
True
False
The Arrhenius Equation shows that the rate increases exponentially as temperature drops.
True
False
The Arrhenius Equation has an Empirical relationship showing the temperature effect on chemical reactions.
True
False
The Arrhenius Equation requires the reaction rate constant.
True
False
The Arrhenius Equation DOES NOT require the reaction rate constant.
True
False
Stability is officially defined as the time lapse during which the drug product retains, within specified limits, the same properties and characteristics that it possessed at the time of manufacture.
True
False
Stability is officially defined as the time lapse during which the drug product looses, within specified limits, the same properties and characteristics that it possessed at the time of manufacture.
True
False
