Antihistamines are safe during the first trimester.
Koren
G
G
University of Toronto.
D000014:Abnormalities, Drug-Induced / Q000209:etiology; D005260:Female; D006634:Histamine H1 Antagonists / Q000627:therapeutic use*; D006801:Humans; D006967:Hypersensitivity / Q000188:drug therapy*; D009325:Nausea / Q000188:drug therapy; D011247:Pregnancy; D011248:Pregnancy Complications / Q000188:drug therapy*; D011261:Pregnancy Trimester, First; D014839:Vomiting / Q000188:drug therapy
D006634:Histamine H1 Antagonists