Drugs Acting on the Respiratory System Flashcards
common cold is caused by
rhinovirus
common cold is most contagious _________ before the onset of symptoms, and during the ______________ of the cold
1-4 days; first 3 days
transmission of common cold:
touching contaminated surfaces, then touching the nose or mouth
Drugs for common cold:
antihistamines, decongestants, antitussives, and expectorants
sign and symptoms of common cold:
rhinorrhea, nasal congestion, cough, and increased mucosal secretions
Inflammation of the mucuous membrane that usually accompanies the common cold
Acute Rhinitis
caused by pollen or foreign substance
Allergic Rhinitis
Allergic Rhinitis also called as
hay fever
H1 blockers or H1 antagonists
Antihistamines
Not useful in an emergency situation e.g. anaphylaxis
Antihistamines
Rapidly absorbed in 15 minutes but not potent enough to combat anaphylaxis
Antihistamines
First-Generation Antihistamines can cause
drowsiness, dry mouth, and other anticholinergic symptoms
patient should be alerted of what when taking First-Generation Antihistamines?
Patient should be alerted not to drive or operate machinery when taking such medications
Decreases secretions, nasal itching and tickling that cause sneezing
First-Generation Antihistamines
Frequently combined with other ingredients in cold remedy preparations
DIPHENHYDRAMINE (Benadryl)
DIPHENHYDRAMINE (Benadryl) routes:
Oral, IM, IV
major side effects of Diphenydramine (Benadryl)
drowsiness
should First-Generation Antihistamines be given with food?
yes
avoid __________________ insertion for First-Generation Antihistamines
Subcutaneos
can First-Generation Antihistamines pass on to breast milk?
yes
Fewer anticholinergic effects and lower incidence of drowsiness
Second-Generation Antihistamines
Second-Generation Antihistamines
Cetirizine, Fexofenadine, and Loratadine, Azelastine
half life of Cetirizine, Fexofenadine, and Loratadine
7-15 hrs
half life of Azelastine
22hrs; nasal spray
Stimulate the alpha-adrenergic receptors → vasoconstriction (nasal mucosa) → shrinking of the nasal mucosal membranes and reduction in fluid secretion
NASAL DECONGESTANTS
NASAL DECONGESTANTS can be
Nasal spray or drops, tablets, capsule, liquid
frequent use of Nasal Decongestants can result in
tolerance and rebound nasal congestion
advantage of Nasal Decongestants:
Fewer side effects than systemic decongestants
Systemic Decongestants can be
Tablet, capsule, liquid
Used primarily for allergic rhinitis including hay fever and acute coryza
Systemic Decongestants
Systemic Decongestants
Ephedrine, Phenylephrine, Pseudoephedrine
Frequently combined with antihistamine, analgesic, or antitussive in oral cold remedies
Systemic Decongestants
Advantage of Systemic Decongestants:
relieve nasal congestion for a longer period than nasal decongestants
Side Effects and Adverse Reactions of Decongestants:
increased BP and blood glucose levels
may decrease the effect of beta blockers
Pseudoephedrine
Intranasal Glucocorticoids
Beclomethasone, Budesonide, Dexamethasone, Flunisolide,
Fluticasone, Triamcinolone
Effective for treating allergic rhinitis
Intranasal Glucocorticoids
Antiinflammatory action – decrease sx of rhinorrhea, sneezing, and congestion
Intranasal Glucocorticoids
Chronic use – dryness of nasal mucosa
Intranasal Glucocorticoids
Dexamethasone should NOT be used for
more than 30 days
naturally protective way to clear airway of secretions or any collected material
Cough
Act on the cough-control center in the medulla to suppress the cough reflex
Antitussives
Indicated ONLY for nonproductive, irritating cough
Antitussives
may decrease the constant, irritating cough
Hard candy (Antitussives)
3 Types of Antitussives
Nonnarcotic, Narcotic, Combination
Antitussives
Dextrometorphan (Rubitussin), Butamirate Citrate (Sinecod)
Duration of action and half life of Dextrometorphan (Rubitussin), Butamirate Citrate (Sinecod)
3-6hrs; 11 hrs
Loosen bronchial secretions so they can be eliminated by coughing
Guaifenesin (Expectorants)
best natural expectorant
Hydration
when taking Guaifenesin (Expectorants), instruct pt to increase fluid intake to at least _________________ per day to help loosen mucus
8 glasses
is indicative of a bronchial infection
yellowish-greenish mucus
Tell pt that __________________________ may occur when dextromethorphan is taken with MAOIs
hypotension and hyperpyrexia
are not helpful in treating common cold viruses
Antibiotics
Teach pt not to take a cold remedy before or at bedtime; ______________ may occur if it contains decongestant
Insomnia
mode of transmission of cold and flu viruses:
hand-to-hand contact or by touching contaminated surfaces
Encourage pt to cough effectively. How?
deep breaths before coughing in an upright position
Inflammation of the mucous membrane of one or more of the maxillary, frontal, ethmoid or sphenoid sinuses
Sinusitis
indicated to treat Sinusitis
Systemic or nasal decongestant
Inflammation of the throat
ACUTE PHARYNGITIS
ACUTE PHARYNGITIS a.k.a
sore throat
Can be caused by a virus, beta-hemolytic streptococci (strep throat), or other bacteria
ACUTE PHARYNGITIS
symptoms of ACUTE PHARYNGITIS
fever and cough
are Antibiotics effective for viral pharyngitis?
NO
Inflammatory disorder of the airway associated with a varying amount of airway obstruction
asthma
Progressive lung disease caused by smoking and chronic lung infections
Chronic Bronchitis
triggers for asthma
stress, allergens, and pollutants
stress, allergens, and pollutants → inflammation and edema of bronchial airways → constriction of air passages → wheezing, coughing, dyspnea, chest tightness
Asthma
Bronchial inflammation and excessive mucus secretion → airway obstruction → productive coughing, expiratory rhonchi, hypercapnia, hypoxemia
Chronic Bronchitis
Progressive lung disease caused by cigarette smoking, atmospheric contaminants, or lack of a1-antitrypsin protein that inhibits proteolytic enzymes that destroy alveoli
Emphysema
Selective B2 drug
Albuterol/Salbutamol
Effective for treatment and control of asthma
Albuterol/Salbutamol
Albuterol/Salbutamol is more rapid by ______________ (__min) than _____ (__ mins)
inhalation; 1 ; orally ; 15
what is the first beta adrenergic agent used for bronchospasm? and when?
First beta adrenergic agent used for bronchospasm, 1941
Non-selective beta agonist (B1 and B2)
Isoproterenol
B1 stimulation
inrease heart rate
B2 stimulation
bronchodilation
Isoproterenol duration of action, long or short?
short
side effects and adverse reactions of Aerosol Inhaler:
mouth dryness, throat irritation, tolerance, severe paradoxical airway resistance, tremors, nervousness, and increased heart rate
Side Effects and Adverse Reactions of Epinephrine
Tremors, dizziness, hypertension, tachycardia, heart palpitations, cardiac dysrhythmias, and angina
Side Effects and Adverse Reactions of Beta2-adrenergic drugs
Tremors, headaches, nervousness, tachycardia, palpitations
Used for maintenance treatment of bronchospasms associated with COPD
Tiotropium (Spiriva) (Anticholinergics)
Used to treat asthmatic conditions by dilating the bronchioles
Ipratropium bromide (Atrovent)
Anricholinergic is combined with with ______________________ to treat chronic bronchitis
albuterol sulfate
Administer b-agonist inhalants, _________________ using ipratropium
5 mins before
Administer inhaled glucocorticoids or cromolyn _________ using ipratropium
5 mins after
METHYLXANTHINE (XANTHINE) DERIVATIVES
Aminophylline, theophylline, caffeine
Group of bronchodilators used to treat asthma
METHYLXANTHINE (XANTHINE) DERIVATIVES
Stimulate the CNS and respiration, dilate coronary and pulmonary vessels, and cause diuresis
METHYLXANTHINE (XANTHINE) DERIVATIVES
what is first theophylline preparation produced? and when?
Aminophylline, 1936
Inhibition of phosphodiesterase → increased cAMP → relaxation of
smooth muscles of bronchi, bronchioles, and pulmonary blood vessels
→ bronchodilation
Theophylline
therapeutic range of Theophylline
10-20 mcg/mL
Once used as a first-line drug for pts with chronic asthma and other COPDs
Theophylline
serious adverse efects of Theophylline
dysrhythmias, convulsions, cardiorespiratory collapse
decrease the liver metabolism rate and increase the half-life and effects of theophylline
Beta blockers, cimetidine, propranolol, and erythromycin
decreases the effects of theophylline
Barbiturates and carbamazepine
theophylline decreases the effects of?
lithium
theophylline has a decreased risk of
digitalis toxicity
decreases theophylline levels
phenytoin
theophylline has a synergistic effect when given with
B-adrenergic agonist
should bronchodilators be administered before or after meals?
after meals
what type of diet increases theophylline elimination?
high-protein, low-carbohydrate diet
LEUKOTRIENE RECEPTOR ANTAGONISTS AND SYNTHESIS INHIBITORS
Zafirlukast, Montelukast sodium, Zileuton
LEUKOTRIENE RECEPTOR ANTAGONISTS AND SYNTHESIS INHIBITORS
Leukotriene
Promote an increase in eosinophil migration, mucus production, and airway wall edema → bronchoconstriction
Leukotriene
Effective in reducing inflammatory symptoms of asthma triggered by allergic and environmental stimuli
Leukotriene
Leukotriene is not recommended for the treatment of?
acute asthmatic attack
Leukotriene is safe for (age range)
6 years old and above
GLUCOCORTICOIDS (STEROIDS)
Beclomethasone, dexamethasone, prednisone, prednisolone, methylprednisone, hydrocortisone
Indicated if asthma is unresponsive to bronchodilator therapy or if the pt has an asthmatic attack while on maximum doses of theophylline or adrenergic drug
GLUCOCORTICOIDS (STEROIDS)
indicated for Acute asthma exacerbations
Systemic glucocorticoids
should Glucocorticoids (Steroids) be taken with food?
YES
Short Acting Bronchodilator
Short Acting B2 Agonist Agent (SABA) = Salbutamol, Terbatuline
Short Acting Anti-Muscarinic Agent (SAMA) = Ipratropium Bromide
Long Acting Bronchodilator
Long Acting B2 Agonist Agent (LABA) = Salmeterol, Folmoterol, Indacaterol
Long Acting Anti-Muscarinic Agent (LAMA) = Tiotropium
Inhaled Corticosteroid (ICS)
Fluticasone, Budesonide, Beclomethasone
Fungal infections may be prevented by using a
spacer
Used for prophylactic treatment of bronchial asthma and must be taken daily
Cromolyn sodium
Acts by inhibiting histamine release to prevent an asthma reaction
Cromolyn sodium
Has anti-inflammatory effects and suppress the release of histamine, LTs, and other mediators from the ,ast cells
Nedocromil sodium
More effective than cromolyn
Nedocromil sodium
DRUG THERAPY FOR ASTHMA ACCORDING TO AGE
Young children
Cromolyn and nedocromil
Oral glucocorticoids
Oral b2-adrenergic agonist
inflammatory effects of asthma
Cromolyn and nedocromil
control a moderate to severe asthmatic state
Oral glucocorticoids
dose and frequency of Oral Glucocorticoids for Young Children with asthma
1-2 inhalations 3-4x a day or 40-80mcg 2x/day
drug for severe asthma attacks in young children
Oral b2-adrenergic agonist
DRUG THERAPY FOR ASTHMA ACCORDING TO AGE
Older adults
B2-adrenergic agonist and methylxanthines
Frequent glucocorticoids
can cause tachycardia, nervousness, and tremors in older adults esp those with cardiac conditions
B2-adrenergic agonist and methylxanthines
increased risk of developing cataracts, osteoporosis, and DM
Frequent glucocorticoids
Liquefy and loosen thick mucus secretions so they can be expectorated
MUCOLYTICS
should Acetylcysteine be mixed with other drugs?
NO
Antidote for acetaminophen overdose of given within 12-24h after overdose inegestion
Acetylcysteine
Enzyme that digests DNA in thick sputum secretions of patients with cystic fibrosis
Dornase alfa
Hep reduce respiratory infections and improves pulmonary function
Dornase alfa
Used ONLY if a bacterial infection results from retained mucus secretions
ANTIMICROBIALS
Trimethoprim-sulfamethoxazole a.k.a
Co-trimoxazole
Effective for mild to moderate acute exacerbations of chronic bronchitis from infectious causes
Trimethoprim-sulfamethoxazole (Co-trimoxazole)
work primarily by stimulating alpha-adrenergic receptors in the smooth muscles of blood vessels in the nasal mucosa. This stimulation causes vasoconstriction, or the narrowing of blood vessels.
Nasal Decongestants
Beta-2 adrenergic receptors: It causes bronchodilation, which relaxes the smooth muscles of the airways, improving airflow and making it essential in treating bronchospasm.
Epinephrine