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Prevents mast cells from degranulating — stopping the release of histamine, leukotrienes, and other inflammatory mediators before they trigger symptoms.
Blocks histamine H1 receptors directly at target tissues — a second line of action that manages symptoms even when some mediator release occurs.
Cetirizine is a second-generation H1 antihistamine used for allergies, chronic hives, and mast cell activation syndrome (MCAS). Compounded formulations offer dye-free, preservative-free, and custom-dose options for sensitive patients.
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Cetirizine selectively blocks peripheral H1 histamine receptors, reducing the allergic response without significant central nervous system sedation. It inhibits histamine-mediated symptoms including itching, sneezing, rhinorrhea, and urticaria.
Commercial cetirizine (Zyrtec) contains dyes, flavoring agents, and fillers that can trigger reactions in patients with MCAS, histamine intolerance, or chemical sensitivities. Compounded cetirizine can be prepared dye-free, in custom doses, or as preservative-free liquid suspensions.
Cetirizine is one of the most commonly prescribed second-generation antihistamines worldwide. As an H1 receptor antagonist, it provides effective relief from allergic symptoms with less sedation than first-generation antihistamines like diphenhydramine.
For patients with mast cell activation syndrome (MCAS) or multiple chemical sensitivities, commercial cetirizine products often contain problematic excipients. Compounding pharmacies can prepare cetirizine in clean formulations — free of dyes, artificial flavors, and common allergens — making it accessible to even the most sensitive patients.
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⚠️ Dosing should be determined by your prescriber. The information below is general guidance only.
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Prevents mast cells from degranulating — stopping the release of histamine, leukotrienes, and other inflammatory mediators before they trigger symptoms.
