Medication Summary
If the patient is symptomatic enough to require treatment, antihistamines are used to counteract the excessive histamine-induced effects; H1- and H2-blockers may be useful. Epinephrine or other adrenergic agents are rarely necessary because the entire cascade of mediators released by a true allergic reaction is not found in scombroid poisoning. Blockade of histamine, the sole pharmacologic mediator of scombrotoxism symptoms, generally is the only treatment necessary. Adrenergic agents may be considered in the rare case of secondary bronchospasm or refractory hypotension associated with this type of poisoning.
Antihistamines
Class Summary
These agents directly counteract the symptom-causing histamine excess.
Diphenhydramine (Benadryl)
Oral or IV H1-receptor antagonists are DOC. Other antihistamines also may be used.
Cimetidine (Tagamet)
H2-receptor antagonist that may be used in conjunction with H1-blockers for severely symptomatic cases.
Ranitidine (Zantac)
H2-receptor antagonist may be used in conjunction with H1-blockers for severely symptomatic cases. Has fewer drug interactions than cimetidine and may be better for patients who take other medications metabolized by the cytochrome p450 system.
Beta2-adrenergic Agonist Agent
Class Summary
Relaxes bronchial smooth muscle by action on beta2-receptors.
Albuterol (Proair HFA, Proventil, Ventolin)
Beta-agonist used for bronchospasm. Stimulates adenyl cyclase to convert ATP to cAMP and causes bronchodilation. Relaxes bronchial smooth muscle by action on beta2-receptors with little effect on cardiac muscle contractility. May decrease mediator release from mast cells and basophils and inhibit airway microvascular leakage.
Frequency may be increased. Institute regular schedule in patients on anticholinergic drugs who remain symptomatic. Available as liquid for nebulizer, MDI, and dry powder inhalers.
Anticholinergic Agent
Class Summary
Quaternary ammonium anticholinergic bronchodilator. Synergistic when used with beta2-agonist.
Ipratropium (Atrovent)
A quaternary ammonium anticholinergic bronchodilator acting at muscarinic receptors of the parasympathetic nervous system. Chemically related to atropine. Has antisecretory properties and, when applied locally, inhibits secretions from serous and seromucous glands lining the nasal mucosa.
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