1. Drugs used in anxiety and panic disorders
Prof. Hanan Hagar
Pharmacology Unit
College of Medicine

2. Objectives
By the end of this lecture you will be able to:
Define different types of anxiety disorders
Classify types of drugs used for treatment of anxiety
Recognize the different characteristics of anti-anxiety drugs

3. Antianxiety drugs
Drugs that can relieve anxiety without interfering with mental or physical function.

4. Physical and emotional distress which interferes with normal life.
What is anxiety ?
Physical and emotional distress which interferes with normal life.

5. Symptoms of anxiety
Emotional or psychic symptoms.
Physical or somatic symptoms.

6. Emotional Symptoms of anxiety
Irrational and excessive fear and worry
Irritability
Restlessness
Trouble concentrating
Feeling tense

7. Physical Symptoms of Anxiety
Sweating
Tachycardia
Shortness of breath
Stomach upset
Frequent urination or diarrhea
Sleep disturbances (Insomnia)
Fatigue

8. Types of anxiety Generalized anxiety disorder
Post-traumatic stress disorder (PTSD).
Obsessive-compulsive disorder (OCD).
Panic disorder
Phobia

9. Generalized Anxiety Disorder (GAD)
Patients are usually and constantly worried
about health, money, work with no apparent
reasons.

10. Obsessive-Compulsive Disorder (OCD)
An anxiety disorder in which people cannot prevent themselves from unwanted thoughts or behaviours that seem impossible to stop as
Washing their hands

11. Panic disorder
An disorder in which people have sudden and intense attacks of anxiety in certain situations.

12. Post-traumatic stress disorder (PTSD)
An anxiety disorder that affects people who have experienced a severe emotional trauma, such as rape or dramatic car accident, or even war.

13. Phobia An intense, uncontrolled fear of a specific situation such as
open spaces & heights

14. Treatment of anxiety Psychotherapy (cognitive behavioral therapy).
Anxiolytics

15. Classification of anxiolytic drugs
Benzodiazepines ( BDZ ).
5HT1A agonists.
5HT reuptake inhibitors.
Antidepressants
Beta-adrenergic blockers
MAO inhibitors

16. Benzodiazepines

17. Nomenclature of Benzodiazepines Have the suffix “zolam” or “zepam”
Alprazolam
Estazolam
Triazolam
Lorazepam
Oxazepam
Temazepam
Diazepam
Flurazepam

18. Classifications of Benzodiazepines
are classified according to duration of action into:
Short acting(3-8 hours): triazolam- Oxazepam
Intermediate(10-20 hours): “ALET”
Alprazolam - Lorazepam
Estazolam - Temazepam
Long acting: ( hours)
Chlordiazepoxide -Diazepam -Flurazepam

20. GABA (γ-aminobutyric acid): is an inhibitory neurotransmitter
Mechanism of Action
Benzodiazepines act by binding to BZ receptors
in the brain  enhance GABA action on brain  chloride channels opening   chloride influx to the cell  hyper- polarization  reduction of neural excitability.
GABA (γ-aminobutyric acid):
is an inhibitory neurotransmitter

22. Pharmacokinetics are lipid soluble well absorbed orally,
can be given parenterally
Chlordiazepoxide- Diazepam (IV only NOT IM)
widely distributed.
cross placental barrier (Fetal depression).
excreted in milk (neonatal depression).
metabolized in the liver to active metabolites (long duration of action- cumulative effect).

23. Pharmacological Actions
Anxiolytic action.
Depression of cognitive and psychomotor function
Sedative & hypnotic actions
Anterograde amnesia
Minimal depressant effects on
cardiovascular system
respiratory system
Some have anticonvulsant effect:
clonazepam, diazepam.

24. Therapeutic Uses of Benzodiazepines
Anxiety disorders:  
short term relief of severe anxiety
General anxiety disorder
Obsessive compulsive disorder
Panic attack with depression Alprazolam
(antidepressant effect)
Sleep disorders (Insomnia).
Triazolam, Lorazepam, Flurazepam

25. Therapeutic Uses Treatment of epilepsy Diazepam – Lorazepam
In anesthesia
Pre-anesthetic medication (diazepam).
Induction of anesthesia (Midazolam, IV)

26. Ataxia (motor incoordination)
Adverse Effects
Ataxia (motor incoordination)
Cognitive impairment.
Hangover: (drowsiness, confusion)
Tolerance & dependence
Risk of withdrawal symptoms: (rebound insomnia, anorexia, anxiety, agitation, tremors & convulsion).
Respiratory & cardiovascular depression in large doses only (toxic effects).

27. Drug interactions t ½ of benzodiazepines Drugs Examples
CNS depressants
Alcohol & antihistaminics
effect of benzodiazepines
Cytochrome P450 inhibitors
Cimetidine & erythromycin
t ½ of benzodiazepines
CYT P450 inducers
Phenytoin & rifampicin
t 1/2 of benzodiazepines

28. Precautions: pregnant women or breast-feeding. Liver disease
Old people.
Dose reduction is recommended.

29. 5HT1A agonists Buspirone
acts as agonist at brain 5HT1A receptors
rapidly absorbed orally.
Slow onset of action (delayed effect)
T½ : (2 – 4 h).

30. Buspirone Only anxiolytic No hypnotic effect. Not muscle relaxant.
Not anticonvulsant.
No potentiation of other CNS
depressants.
Minimal psychomotor and
cognitive dysfunctions.
Does not affect driving skills.
Minimal risk of dependence.
No withdrawal signs.

31. Uses of buspirone
As anxiolytic in mild anxiety & generalized anxiety disorders.

32. Disadvantages of buspirone
Slow onset of action (delayed effect)
GIT upset, dizziness, drowsiness
Not effective in severe anxiety/panic disorders
Drug interactions with CYT P450 inducers
and inhibitors

33. Beta Blockers Drugs as Propranolol – atenolol
act by blocking peripheral sympathetic system.
Reduce somatic symptoms of anxiety.
Decrease BP & slow HR.
Used in performance anxiety.
are less effective for other forms of anxiety
should be used with caution in asthma, cardiac failure, peripheral vascular disorders

35. Tricyclic Antidepressants
Doxepin- imipramine
act by reducing uptake of 5HT & NA.
Used for anxiety especially associated with
depression.
Effective for panic attacks.
Delayed onset of action (weeks).

36. Side effects of tricyclic antidepressants Atropine like actions
(dry mouth-blurred vision, tachycardia).
α-blocking activity (Postural hypotension).
Sexual dysfunction.
Weight gain.

37. Selective serotonin reuptake inhibitors (SSRIs)
Fluoxetine
acts by blocking uptake of 5HT
Orally
Delayed onset of action (weeks).
Long half life
Used for panic disorder – OCD depression-
Generalized anxiety disorders - phobia.

38. Side effects of SSRIs Nausea, diarrhea Weight gain Sexual dysfunction
Dry mouth
Seizures
Sleep disturbance

39. Monoamine oxidase inhibitors (MAOIs)
Phenelzine
act by blocking the action of MAO enzymes.
Used for panic attacks and phobia.
Require dietary restriction
Avoid wine, beer, fermented foods as old cheese that contain tyramine.
Side effects
Dry mouth, constipation, diarrhea, restlessness,
dizziness.

40. Conclusion of anxiolytics
CLASSES OF ANXIOLYTICS
USES
Benzodiazepines
Generalized anxiety disorders, OCD, phobia, panic attack
SSRIs
(Fluoxetine)
Tricyclic antidepressants
(doxepin, imipramine )
anxiety with depression
panic attacks
5HT1A agonists
(Buspirone)
Mild anxiety
Not effective in panic attack
Beta blockers
(propranolol, atenolol)
Phobia (social Phobia)

41. Conclusion of anxiolytics
CLASSES OF ANXIOLYTICS
Adverse effects
Benzodiazepines
Ataxia, confusion, dependence, tolerance, withdrawal symptoms,
SSRIs
(Fluoxetine)
Sexual dysfunction
atropine like actions
Tricyclic antidepressants
(doxepin, imipramine )
weight gain, sexual dysfunction, atropine like actions, arrythmia
5HT1A agonists
(Buspirone)
Minimal adverse effects
Beta blockers
(propranolol, atenolol)
Hypotension