Drugs Affecting Respiratory System. Antihistamines. Drugs that directly compete with histamine for specific receptor sites Two histamine receptors H 1 (histamine 1 ) H 2 (histamine 2 ). Histamine-mediated disorders Allergic rhinitis (hay fever, mould and dust allergies) Anaphylaxis
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Drugs Affecting Respiratory System
Drugs that directly compete with histamine for specific receptor sites
H1 antagonists are commonly referred to as antihistamines
They are much less likely to have side effects of sedation and dry mouth
What is nasal congestion?
Two decongestant forms
Nervousness Local mucosal dryness
Insomnia and irritation
(systemic effects due to adrenergic stimulation of theheart, blood vessels, and CNS)
What happens in ASTHMA ?
IN asthmatics inhalers are used to deliver drugs more effectively with minimal side effects
Relievers have to be taken when they get worsening of asthma
Preventers should be used daily for it to be effective
Patients should be clearly educated on this …