Antihistamines (H1 & H2)
H1 and H2 receptor blockers used for allergy, MCAS, chronic urticaria, and related histamine-driven conditions — compounded dye-free for sensitive patients.
About Antihistamines
Antihistamines block histamine at H1 receptors (cetirizine, hydroxyzine, diphenhydramine, azelastine) or H2 receptors (famotidine). Cyproheptadine is a first-generation H1 blocker with additional antiserotonergic activity. In MCAS and CIRS protocols, H1 and H2 antihistamines are typically layered together and often combined with mast cell stabilizers. Compounding is frequently requested because many MCAS patients react to commercial tablet coatings, dyes, and fillers. Licensed 503A compounding pharmacies can prepare these drugs in dye-free, filler-minimized capsules, liquids, and transdermal creams.
Medications in This Class
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Cetirizine
Cetirizine is a second-generation H1 antihistamine used for allergies, chronic hives, and mast cell activation syndrome ...
Compare prices →Hydroxyzine
Hydroxyzine is a first-generation H1 antihistamine prescribed for anxiety, allergies, and pruritus. Compounded dye-free ...
Compare prices →Diphenhydramine
Diphenhydramine (Benadryl) is a first-generation H1 antihistamine available in compounded formulations including dye-fre...
Compare prices →Azelastine
Azelastine is a second-generation H1 antihistamine primarily used as a nasal spray and eye drops for allergic rhinitis a...
Compare prices →Cyproheptadine
Cyproheptadine is a first-generation H1 antihistamine with additional antiserotonergic properties. It is commonly compou...
Compare prices →Famotidine
Famotidine is an H2 histamine blocker commonly used for acid reflux, peptic ulcers, and as part of mast cell activation ...
Compare prices →Conditions Treated with Antihistamines
Compare Prices for Antihistamines
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