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Worldmeds

Cetirizine

セチリジン

INN: Cetirizine

Second-generation AntihistaminePublished

Last updated: 3/14/2026

Mechanism of Action

JA日本語

ヒスタミンH1受容体を選択的に拮抗し、アレルギー反応を抑制します。第二世代抗ヒスタミン薬であり、血液脳関門の通過が少なく、眠気の副作用が軽減されています。

ENEnglish

Selectively antagonizes histamine H1 receptors, suppressing allergic reactions. As a second-generation antihistamine, it has limited blood-brain barrier penetration, resulting in reduced sedation.

Side Effects

JA日本語

眠気(第一世代より軽度)、口渇、倦怠感、頭痛。まれに肝機能異常。

ENEnglish

Drowsiness (milder than first-generation), dry mouth, fatigue, headache. Rarely hepatic dysfunction.

Contraindications

JA日本語

本剤の成分またはピペラジン誘導体に対し過敏症の既往歴のある患者。重度の腎障害のある患者(用量調整必要)。

ENEnglish

Patients with a history of hypersensitivity to any component or piperazine derivatives. Patients with severe renal impairment (dose adjustment required).