Antihistamine — H1 antagonist (first-generation, sedating)

Diphenhydramine

ไดเฟนไฮดรามีน

ชื่อทางการค้า · Benadryl

กลไกการออกฤทธิ์ · Mechanism

TEMPLATE — mechanism pending Thai translation + faculty review (cross-check DailyMed + WHO ATC + PubChem + WHO Essential Medicines List)

TEMPLATE — indications pending Thai translation + faculty review (cross-check DailyMed + WHO ATC + PubChem + WHO Essential Medicines List)^{[1] [2] [3] [4]}

TEMPLATE — contraindications pending Thai translation + faculty review (cross-check DailyMed + WHO ATC + PubChem + WHO Essential Medicines List)^{[1] [2] [3] [4]}

Species	Indication	Route	Dose	Cite
canine	TEMPLATE — pending faculty review	PO	— TEMPLATE: รอ dose จาก peer-reviewed source + faculty signoff —	^{[1] [2] [3] [4]}
feline	TEMPLATE — pending faculty review	PO	— TEMPLATE: รอ dose จาก peer-reviewed source + faculty signoff —	^{[1] [2] [3] [4]}

TEMPLATE — side effects pending Thai translation + faculty review (cross-check DailyMed + WHO ATC + PubChem + WHO Essential Medicines List)^{[1] [2] [3] [4]}

1regulatory-database · Diphenhydramine — NLM DailyMed (FDA Structured Product Labeling), 2025upstream ↗c/2c279fb5…d1b4Cross-checked source: FDA-approved labeling. Search by name returns relevant product labelings.
2guideline · ATC R06AA02 — Diphenhydramine, 2025upstream ↗c/1ffe52bb…66e0Cross-checked source: WHO Collaborating Centre ATC/DDD index. Authoritative drug classification.
3monograph · Diphenhydramine — PubChem search, 2025upstream ↗c/03ccef01…9fe8Cross-checked source: chemical structure, identifiers, pharmacology summary. Faculty review fills exact CID.
4guideline · WHO Model List of Essential Medicines (22nd List, 2021), 2021upstream ↗c/71030c79…53ebCross-checked source: drug appears on WHO EML — WHO recognizes its place in basic healthcare.