Pharmacology Notes: Anxiety and Insomnia Medications

Drugs for Anxiety and Insomnia: Benzodiazepines and SSRIs

Introduction to Anxiety and Insomnia

  • Anxiety Defined: A state of apprehension, tension, and emptiness, resulting from an imminent perceived danger. The source is often unknown or disproportionate to factual dangers. Individuals may identify some contributing factors.

  • Types of Anxiety:

    • Situational Anxiety: Occurs in specific situations such as public speaking (e.g., college graduation speaker), social events, grocery shopping, or ordering food. Symptoms may include increased heart rate.

    • Seasonal Anxiety: Linked to changes in seasons. Individuals may experience depression and anxiety, particularly during winter months when it is rainy, snowy, gloomy, and darker earlier.

    • Post-Traumatic Stress Disorder (PTSD): Extreme situational anxiety that develops in response to re-experiencing a previous life event. It takes individuals back to the traumatic situation. People suffering from PTSD are at a higher risk of suicide.

  • Insomnia and Sleep Statistics:

    • People in the South and Eastern U.S. report short sleep duration (less than 7 hours per 24-hour period).

    • Short sleep prevalence does not differ significantly between men and women.

    • Patients older than 65 years sleep less than other age groups.

    • Only about 70\% of people with insomnia report the problem to their healthcare providers.

    • Over-the-counter sleep medication and combination drugs with sleep additives are bought more often than any other drug category.

    • Natural solutions for sleep include melatonin and herbal remedies.

  • Stages of Sleep (Table 14.4):

    • Non-REM Stage 1: Onset of sleep.

    • Non-REM Stage 2: Light sleep, heart rate slows down, body temperature starts to drop. Inhibited by light. As melatonin production rises, alertness decreases, and body temperature falls, making sleep more inviting.

Benzodiazepines

  • Primary Use: Drugs used often in hospital settings by nurses for various indications.

  • Mechanism of Action: Enhances Gamma-aminobutyric acid (GABA).

    • GABA Explained: An inhibitory neurotransmitter in the brain and central nervous system (CNS). It regulates brain activity. Think of GABA as a "brake pedal" for the brain; when activated, it slows down brain activity.

    • Effect: Reduces anxiety and stress by slowing down an overactive brain, similar to how a car slows down when the brake pedal is pressed.

  • Key Benzodiazepine Drugs:

    • Alprazolam ( ext{alprazolam})

    • Clonazepam ( ext{clonazepam})

    • Lorazepam ( ext{lorazepam}) (a first-line drug for seizure patients in the ER).

  • Indications (What they are used for):

    • Anxiety

    • Insomnia

    • Seizure control (by slowing overfiring neurons in the brain)

    • Procedural sedation

    • Muscle spasms

    • Alcohol withdrawal

  • Side Effects:

    • Drowsiness

    • Sedation

    • Respiratory Depression (Major Concern): Can slow down breathing significantly. This is used therapeutically in hospice patients to calm them and ease breathing anxiety.

    • Risk of dependence (addiction) and misuse (why they are not kept in prisons often).

    • Muscle weakness (e.g., in the chest, allowing for relaxation).

  • Nursing Considerations & Patient Education:

    • Safety: Patients should not operate heavy machinery or drive while on benzodiazepines, as it is akin to driving under the influence.

    • Monitoring: Nurses must monitor patients' breathing (respiratory drive) after administration.

    • Overdose Reversal: In cases of respiratory depression or overdose, the reversal agent (antidote) is Flumazenil ( ext{flumazenil}).

    • Monitor for signs of misuse or dependence.

Selective Serotonin Reuptake Inhibitors (SSRIs)

  • Classification: These are selective serotonin reuptake inhibitors.

  • Key SSRI Drugs:

    • Fluoxetine ( ext{fluoxetine})

    • Sertraline ( ext{sertraline})

    • Citalopram ( ext{citalopram})

    • Paroxetine ( ext{paroxetine})

    • Escitalopram ( ext{escitalopram})

  • Indications:

    • Major depressive disorders

    • Anxiety disorders (e.g., generalized anxiety disorder)

    • Obsessive-Compulsive Disorder (OCD)

    • Post-Traumatic Stress Disorder (PTSD)

  • Side Effects (Common reasons for patient non-compliance):

    • Sexual Dysfunction: (e.g., erectile dysfunction). Sometimes bupropion ( ext{bupropion}) is used to help counteract this.

    • Weight Gain: Patients can gain 15 to 20 pounds.

    • Common GI problems: Nausea, vomiting, diarrhea.

  • Crucial Warning & Nursing Considerations:

    • NEVER STOP SUDDENLY: Abrupt discontinuation is very dangerous and can lead to increased suicidal ideation, even in individuals who were not previously suicidal.

    • Monitoring: Nurses must monitor for suicidal ideation immediately and report any concerns.

    • Response Time: These medications take at least 4 to 6 weeks to become effective; patients should be educated on this expected timeline.

    • Drug Interactions: Taking SSRIs with other serotonin-enhancing medications can cause severe symptoms or enhance existing side effects.

Other Sedative Medications

  • Zolpidem ( ext{zolpidem}) (Ambien ( ext{Ambien})):

    • A non-benzodiazepine sedative medication.

    • Use: Primarily given for insomnia.

    • Mechanism: Works on GABA to cause sedation and CNS depression (similar to benzodiazepines in effect but different chemical structure).