Pharmacology Unit 6 Flashcards
What is the function of the Blood Brain Barrier?
Acts as a selective filter and protects CNS by limiting substances that enter the brain and spinal cord
The Blood Brain Barrier is crucial for maintaining the homeostasis of the central nervous system.
What causes the barrier effect of the Blood Brain Barrier?
The tight junctions that occur between capillary endothelial cells
These tight junctions prevent the free passage of substances and help maintain the integrity of the barrier.
Which non-neuronal cells contribute to the Blood Brain Barrier?
Astrocytes and the capillary basement membrane
Astrocytes play a significant role in the maintenance and regulation of the Blood Brain Barrier.
What are exceptions to the Blood Brain Barrier’s selective permeability?
The presence of carrier-mediated transport systems
These transport systems allow certain essential substances to cross the barrier.
What are the two general categories of sedative hypnotic drugs?
Benzodiazepines and Nonbenzodiazepines
What is the primary function of sedative hypnotic drugs?
Promote sleep
What calming effect do sedative hypnotic drugs have on patients?
Helps relax the patient
What are non-benzodiazepines in the context of sedative hypnotic drugs?
A class of sedative hypnotic drugs that includes various agents like zolpidem, zaleplon, and eszopiclone.
What is the therapeutic index (TI) of barbiturates?
Small therapeutic index (TI = TD/ED).
Can be addictive
What is the mechanism of action of barbiturates at low doses?
Potentiates GABA but at a unique site.
What happens to the mechanism of action of barbiturates at higher doses?
Increases the release of inhibitory neurotransmitters. (Glycine)
Name three examples of non-benzodiazepine sedative hypnotics.
- Zolpidem (Ambien)
- Zaleplon (Sonata)
- Eszopiclone (Lunesta)
How do non-benzodiazepines affect GABA?
They increase chloride influx.
What is a notable advantage of non-benzodiazepines compared to barbiturates?
Less side effects and shorter duration of action.
What is the structure and function of Ramelteon similar to?
Similar to melatonin.
What is the primary route of administration for benzodiazepines and nonbenzodiazepines?
Oral administration
Highly lipid soluble, absorbed easily
Describe the distribution of benzodiazepines and nonbenzodiazepines.
Fairly uniform
Indicates that these drugs distribute evenly throughout the body
How are benzodiazepines and nonbenzodiazepines metabolized?
Oxidative enzymes in liver cells
The liver plays a crucial role in the metabolism of these substances
What mechanisms are involved in the termination of effect for benzodiazepines and nonbenzodiazepines?
Hepatic enzymes or storage in non-CNS tissues (sequestering)
This can lead to a prolonged effect or hangover
What is a common side effect associated with the use of benzodiazepines and nonbenzodiazepines?
Hangover effect
- This can include drowsiness, confusion, or impaired motor function
Refers to residual effects after the drug’s active effects have worn off
Where are benzodiazepines and nonbenzodiazepines excreted from the body?
Kidneys
The kidneys play a vital role in the elimination of these drugs
With the adverse effects of Sedative-Hypnotics, what is anterograde amnesia?
Inability to form new memories after the onset of drug effects
This can lead to gaps in memory for events that occur while under the influence.
What does tolerance refer to in sedative-hypnotics?
A condition where increasing doses are required to achieve the same effect
This can lead to higher consumption and increased risk of adverse effects.
What is physical dependence in relation to sedative-hypnotics?
A state where the body adapts to the drug, leading to withdrawal symptoms upon discontinuation
Symptoms can include anxiety, tremors, and seizures.