PT - JOURNAL ARTICLE AU - Derek K. Chu AU - Paul Oykhman AU - Gordon L. Sussman TI - How to use antihistamines AID - 10.1503/cmaj.201959 DP - 2021 Apr 06 TA - Canadian Medical Association Journal PG - E478--E479 VI - 193 IP - 14 4099 - http://www.cmaj.ca/content/193/14/E478.short 4100 - http://www.cmaj.ca/content/193/14/E478.full SO - CMAJ2021 Apr 06; 193