Drugs for Respiratory Disorders (Part 02) Flashcards
Treatment of Allergic Rhinitis (AR)
• Antihistamines / H1 Blockers
• Alpha 1 Selective Agonists / Nasal Decongestants
• Inhaled Corticosteroids
(T/F): Combinations of oral antihistamines with decongestants are the first-line therapies for allergic rhinitis.
T
Antihistamines / H1 Blockers that are more lipid soluble and more sedating.
First Generation
Antihistamines / H1 Blockers that are less lipid soluble and less sedating.
Second Generation
Classes under First Generation of Antihistamines / H1 Blockers.
• Ethanolamines
• Piperazine
• Alkylamines
• Phenothiazine
• Miscellaneous
Drug/s under Ethanolamines
• Carbinoxamine (Clistin)
• Dimenhydrinate (Dramamine)
• Diphenhydramine (Benadryl)
Drug/s under Piperazine
• Hydroxyzine (Atarax)
• Cyclizine (Marezine)
• Meclizine (Bonine)
Drug/s under Alkylamines
• Bropheniramine (Dimetane)
• Chlorpheniramine (Chlor-Trimeton)
Drug/s under Phenothiazine
Promethazine (Phenergan)
Drug/s under Miscellaneous in First Generation
Cyproheptadine (Periactin)
Classes under Second Generation of Antihistamines / H1 Blockers.
• Piperidine
• Miscellaneous
Drug/s under Piperidine
Fexofenadine (Allegra)
Drug/s under Miscellaneous in Second Generation
• Loratadine (Claritin)
• Desloratadine (Clarinex)
• Cetirizine (Zyrtec)
Its MOA is to constrict dilated arterioles in the nasal mucosa and reduce airway resistance by binding at alpha 1 receptors.
Alpha 1 Selective Agonists / Nasal Decongestants
An example of alpha 1 selective agonist that is available in cough and cold medications.
Phenylephrine
An example of alpha 1 selective agonist that was withdrawn in USA because it can cause hemorrhagic stroke.
Phenylpropanolamine
A/E of Alpha 1 Selective Agonists / Nasal Decongestants
A. Systemic
• Tolerance
• Exacerbation of Hypertension
• Urinary Retention
B. Inhalation
• Rhinitis Medicamentosa
A condition of rebound nasal congestion suspected to be brought on by extended use of topical decongestants.
Rhinitis Medicamentosa
Drug/s under Inhaled Corticosteroids
• Budesonide
• Beclomethasone
• Fluticasone
• Flunisolide
Drug/s used for Common Colds
• Decongestants
• Antihistamines
• Mucosal Removals
• Antitussives
Vasoconstriction → Mucosal Drying
Decongestants
Combat Increased Histamine = Nasal Congestion and Mucosal Irritation
Antihistamines
Aid in the coughing up and spitting out of the excess mucous that has accumulated in the respiratory tract by breaking down and thinning the secretions.
Mucosal Removals
Actions of Mucosal Removals
• Mucolytic
• Expectorant