小兒咳嗽．半由于風寒．初起以杏蘇煎散之．痰薄者．加半夏、生姜．痰濃者．加川貝、花粉、栝蔞仁之屬．肺有火邪．則瀉白散．此一定之治法也．若秋冬燥令．肺受火刑．則咳而無痰．甚者咳血．宜以貝母栝蔞散潤其肺．清肅之氣下行．則咳自止．