Chronic, but not acute, ethanol exposure impairs central hypercapnic ventilatory drive in bullfrog tadpoles

► Central hypercapnia response of early tadpoles lost after 10-wk ethanol exposure. ► Central hypercapnia response of late tadpoles lost after 10-wk ethanol exposure. ► Chronic ethanol exposure did not affect neuroventilatory activity during normocapnia. ► Acute ethanol exposure did not affect the tadpole central hypercapnic response.