This document discusses antitussive drugs, which are used to suppress coughing. It defines antitussives and expectorants, and describes the mechanism of cough production involving cough receptors in the lungs and the cough center in the medulla. It classifies cough and antitussives, and discusses the mechanisms of action and indications of centrally- and peripherally-acting antitussives. Common antitussives discussed include codeine, hydrocodone, dextromethorphan, and benzonatate. The document also describes several animal models used to screen for antitussive effects, such as measuring coughs induced by irritants in guinea pigs and mechanical stimulation in anesthetized guinea pigs and cats.
Expectorants and antitussives-Dr.Jibachha Sah,M.V.Sc,LecturerDr. Jibachha Sah
Dr. Jibachha Sah,M.V.Sc( Veterinary pharmacology, TU,Nepal),posted lecturer notes on AUTONOMIC AND SYSTEMIC PHARMACOLOGY for B.V.Sc & A.H. 6 th semester veterinary students of College of veterinary science,Nepal Polytechnique Institute, Bharatpur, Bhojard, Chitwan, Nepal.I hope this lecture notes may be beneficial for other Nepalese veterinary students. Please send your comment and suggestion .Email:jibachhashah@gmail.com,moble,00977-9845024121
antitussive drugs, uses, lists, sideffect and many morefcapital
June 15 2016 Antitussives are drugs that suppress coughing, possibly by reducing the activity of the cough center in the brain. Antitussive agents are used to relieve dry cough.
Expectorants and antitussives-Dr.Jibachha Sah,M.V.Sc,LecturerDr. Jibachha Sah
Dr. Jibachha Sah,M.V.Sc( Veterinary pharmacology, TU,Nepal),posted lecturer notes on AUTONOMIC AND SYSTEMIC PHARMACOLOGY for B.V.Sc & A.H. 6 th semester veterinary students of College of veterinary science,Nepal Polytechnique Institute, Bharatpur, Bhojard, Chitwan, Nepal.I hope this lecture notes may be beneficial for other Nepalese veterinary students. Please send your comment and suggestion .Email:jibachhashah@gmail.com,moble,00977-9845024121
antitussive drugs, uses, lists, sideffect and many morefcapital
June 15 2016 Antitussives are drugs that suppress coughing, possibly by reducing the activity of the cough center in the brain. Antitussive agents are used to relieve dry cough.
Dr. Jibachha Sah,M.V.Sc( Veterinary pharmacology, TU,Nepal),posted lecturer notes on AUTONOMIC AND SYSTEMIC PHARMACOLOGY for B.V.Sc & A.H. 6 th semester veterinary students of College of veterinary science,Nepal Polytechnique Institute, Bharatpur, Bhojard, Chitwan, Nepal.I hope this lecture notes may be beneficial for other Nepalese veterinary students. Please send your comment and suggestion .Email:jibachhashah@gmail.com,moble,00977-9845024121
Asthma is a chronic inflammatory disorder of the airways causing airflow obstruction
and recurrent episodes of
wheezing,
breathlessness,
chest tightness and
coughing.
Chronic inflammatory airway disease associated with increased airway responsiveness and reversible airway obstruction.
It can present at any age; majority of cases diagnosed in childhood
Most of them become asymptomatic by adolescence
Disease severity rarely progresses; patients with severe asthma have it at the onset.
FACTORS EFFECTING ASTHMA:
The inside lining of the airways becomes red and swollen (inflammation)
Extra mucus (sticky fluid) may be produced
The muscle around the airways tightens
(bronchoconstriction)
DIAGNOSIS:
Pulse oximetry and ABG analysis
Chest Xray
Blood Test
Peak Flow meter + Spirometry- PEFR + FEV1 decrease
PEFR + FEV1 increase >15% after β agonist inhalation
Skin Testing
we are going to discuss asthma and COPD in the pharmacologicl perspective.
this presentation is done by :
Fatimah Fathi - Noura Bandar - Ahad Fahid - Shuruq Fahad
Dr. Jibachha Sah,M.V.Sc( Veterinary pharmacology, TU,Nepal),posted lecturer notes on AUTONOMIC AND SYSTEMIC PHARMACOLOGY for B.V.Sc & A.H. 6 th semester veterinary students of College of veterinary science,Nepal Polytechnique Institute, Bharatpur, Bhojard, Chitwan, Nepal.I hope this lecture notes may be beneficial for other Nepalese veterinary students. Please send your comment and suggestion .Email:jibachhashah@gmail.com,moble,00977-9845024121
Asthma is a chronic inflammatory disorder of the airways causing airflow obstruction
and recurrent episodes of
wheezing,
breathlessness,
chest tightness and
coughing.
Chronic inflammatory airway disease associated with increased airway responsiveness and reversible airway obstruction.
It can present at any age; majority of cases diagnosed in childhood
Most of them become asymptomatic by adolescence
Disease severity rarely progresses; patients with severe asthma have it at the onset.
FACTORS EFFECTING ASTHMA:
The inside lining of the airways becomes red and swollen (inflammation)
Extra mucus (sticky fluid) may be produced
The muscle around the airways tightens
(bronchoconstriction)
DIAGNOSIS:
Pulse oximetry and ABG analysis
Chest Xray
Blood Test
Peak Flow meter + Spirometry- PEFR + FEV1 decrease
PEFR + FEV1 increase >15% after β agonist inhalation
Skin Testing
we are going to discuss asthma and COPD in the pharmacologicl perspective.
this presentation is done by :
Fatimah Fathi - Noura Bandar - Ahad Fahid - Shuruq Fahad
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
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2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
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Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
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3. Introduction
Symptom of respiratory system:
no sputum---antitussives
Cough
sputum --- expectorants
Asthma ----- antiasthmatic drugs
3
4. DEFINITION
ANTITUSSIVE:-
A drug that suppresses coughing possibly by
reducing the activity of the cough center in the brain.
EXPECTORANT:-
A drug that enhances the secretion of sputum.
4
5. Cough receptors (chemo-and-mechano receptors )
lie in mucosa of the bronchial tree from the nose
to the distal bronchi.
The impulses from these receptors are
transmitted through the vagus and
glossopharyngeal nerves to the cough center in
the medulla.
5
7. Mechanism of cough production
The cough receptors lie in the mucosa of the bronchial tree.
Afferent impulses passes to the medulla.
Then an autonomic sequence of events is triggered by
medulla
causing certain effects.
7
9. Classification of cough
Acute:- less than 3 weeks.
Sub-Acute:- between 3-8 weeks.
Chronic:- longer than 8 weeks.
9
10. COUGH PHYSIOLOGY
Cough Reflex:-
-Initiated by irritation of sensory receptors in the
respiratory tract.
-To remove secretion of foreign objects.
10
11. Coughing
Most of the time, coughing is beneficial
Removes excessive secretions
Removes potentially harmful foreign
substances
11
14. ANTITUSSIVE MOA
OPIOIDS:-
Suppress the cough reflex by acting on the
cough center in the medulla.
NON-OPIODS:-
Suppress the cough reflex by numbing the
stretch receptors in the respiratory tract and preventing
the cough reflex from being stimulated
14
17. Codeine
Selectively suppress cough center in medulla oblongata.
Pharmacokinetics:
Well absorbed from oral and injection.
10% converted to morphine through demethylation.
Clinical Uses:
Dry cough
17
19. Codeine: Possible Side Effects
Shortness of breath
Sedation
Euphoria
allergic reactions
constipation
19
20. Hydrocodone
Antitussive agent
Analgesic agent
more potent than codeine
5mg of hydrocodone is equivalent to 30 mg of
codeine when administered orally
Is combined with an anticholinergic drug
(homatropine)
20
28. ANIMAL MODELS
1. Antitussive activity after irritant inhalation in guinea pig.
2. Cough induced by mechanical stimulation.
3. Cough induced by stimulation of the nervus laryngicus
superior.
4. Cough induced by ammonia in the cat
5. Cough induced by sulfuric acid in the dog
28
29. Antitussive activity after irritant inhalation in
guinea pig
Purpose and rationale:-
The sensitive receptars are located in bronchial tree and
stimulated mechanically and chemically.
Requirements :
Guinea pigs (300-400g),
7.5% Citric acid in water,
Test & standard substance,
Cylindrical glass vessel.
Cylindrical glass vessel
with 2 tubes at either ends. 29
30. Procedure:-
Guinea pig of either sex 300-400gm
Animal placed in cylindrical glass vessel
Guinea pig exposed to aerosol of 7.5% citric acid in water 10 min
No of tussive response is registered
One hour later test substance is applied s.c or orally
After 30 min guinea pig is subjected to aerosol again
30
31. Evaluation:-
The number of coughs after treatment is
expressed as percentage of the control period. Using
various doses ED50 values can be calculated.
31
32. Cough induce by mechanical stimulation
Purpose and rationale :
Cough can be induced by mechanical stimulation of
the trachea in anesthetized guinea pigs.
Requirements :
Male guinea pigs (350-400g), Test drug, Standard drug-
codeine(15, 30, & 60mg/kg), Thin steel wire.
Thin steel wire inserted
into trachea
32
33. Procedure :
Male guinea pigs are lightly anesthetized.
Maintain constant body temperature of 370C by means of heated plate.
Thin steel wire is gently inserted into the trachea through a small
incision near cricoid cartilage.
Coughs are evoked by pushing the steel wire to reach bifurcation of
trachea
Animals are randomly assigned to receive the test drug at various doses
or the standard (codeine 15, 30, 60mg/kg).Ten animals per dose are
used.
33
34. Evaluation :
• Evaluation of statistical significance of the result is performed
with student’s t-test.
• ED50 values determined by logit transformation.
34
35. Cough induced by stimulation of the nervus
laryngicus superior :
Purpose and rationale :
Stimulation of Nervous laryngicus superior induces
coughing. Antitussive agents with predominately central
action suppress the coughing reflex.
Requirements :
Cats of either sex(2-3kg),
Pentobarbital (40mg/kg),
Test compound,
Standard – Codeine phosphate
Fleisch tube pneumotachograph.
Fleisch tube pneumotachograph
35
36. Procedure :
Cats of either sex are anesthetized.
The fur is shaved ventrally at the neck & small incisions are made at both sides
of larynx.
The trachea is cannulated. The cannula is connected with Fleisch tube
One femoral artery and one femoral vein is cannulated
Small hook electrodes are attached to each laryngeal nerve and Wave
impulses are applied every 5min (control)
Intensity of forced expiration is measured by Fleisch pneumotachograph &
recorded with blood pressure on a polygraph. The stimuli are repeated
36
37. Evaluation :
Total or partial suppression of forced
expiration are recorded over time & expressed as
percentage of control.
37
38. Cough induced by ammonia in the cat
Purpose and rationale :
Cough is induce with the help of ammonia.
Requirements :
Cats, 6% pentobarbitone sodium, smoked paper
kymograph, Tracheal cannula, ammonia vapour, polythene
tube.
38
39. Procedure :
Cats are lightly anaesthetized.
The trachea is then cannulated; The carotid artery is connected
to a mercury nanometer.
Injections are made intravenously in the femoral vein.
Coughs are recorded on a smoked kymograph by a lightly sprung
lever
Ammonia is lead into respiratory system by means of a three way
tap.
39
40. The cat is allowed to inhale ammonia vapour for one inspiration.
The cough stimuli are applied every three minutes until 3 or 4
control
cough responses of similar intensity and duration are obtained.
The test drug is then administered intravenously and cough
stimuli are
repeated at similar intervals until the cough response returns to
normal.
40
41. Evaluation :
codeine is used as the antitussive standard, since it
supresses coughing completely at a dose of 2mg/kg or less.
Pholcodeine an dihydrocodeine are approximately as potent as
codeine. The test drugs are scored accordingly.
41
42. Cough induced by sulfuric acid in the dog
Rationale:
Cough is induce with the help of sulfuric acid
Requirments:
Dogs, De Vilbiss nebulizers,0.5M Sulfuric acid, Codeine,
dihydrocodeine, test antitussive drugs.
42
43. Procedure:
Dogs are placed in a special wooden box.
Through two holes a fine vapour of 0.5M sulfuric acid is
sprayed.
A count of the number of coughs is obtained by listening
through earphones to a microphone attached to the dog`s
throat.
After two test periods 1 hour apart, a drug is given before the
next test period.
43
44. Evaluation:
The percent inhibition is obtained by dividing the
number of coughs by the number of coughs during the control
period.
44
45. Referensces
Vogel, W.H., Scholkens, B.A., Sandow, J., Muller, G. and Vogel
W.F.,: Drug Discovery and Evaluation Pharmacological Assays.
2nd ed. Spinger-Verlag Berlin Heidelberg, New York, Germany,
pp. 352-376 (2002).
Turner, R.A., Hebborn, P.,: Screening Methods of
Pharmacology, Vol.-1. Academic Press, London, pp. 238
(1971).
www.wikipedia.com.
Tripathi, K.D.,: Essentials of Medical Pharmacology. 5th ed.
Jaypee Brothers Medical Publishers (P)Ltd., New Delhi, India,
pp. 195, 209 (2004).
www.googleimages.com
45