Antihistamines block histamine receptors (H1 or H2) to reduce allergic responses, itching, and inflammation. Compounded antihistamines allow customized doses, unique combinations, dye-free formulations, and delivery routes not available in commercial products.
H1 antihistamines competitively block histamine H1 receptors on blood vessels, bronchi, and sensory nerve endings, preventing vasodilation, bronchoconstriction, and itch signaling. Second-generation antihistamines have reduced CNS penetration. H2 antihistamines block gastric and mast cell receptors.
Low-dose ketotifen capsules, dye-free and preservative-free formulations, diphenhydramine topicals, custom H1/H2 combinations for MCAS, and pediatric liquid doses all require compounding beyond what's commercially available.
Most antihistamines are commercially available OTC or by prescription. Compounded antihistamines are prescribed when patients require customized doses, specific delivery forms, or formulations free of commercial excipients (dyes, lactose, gluten). MCAS patients often require combinations not commercially available.
These compounded medications belong to this drug class. Click any medication to learn more and compare pharmacy prices.
Submit a free quote request and receive pricing from multiple licensed compounding pharmacies within 1–2 business days.
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