3 ms·
Caffeine is a cerebral vasoconstrictor. Supposedly its the dilation that occurs during withdrawal which causes headaches. Caffeine has a half life of 3 to 5 hou
by jcranberry 5y ago
Caffeine is a cerebral vasoconstrictor. Supposedly its the dilation that occurs during withdrawal which causes headaches. Caffeine has a half life of 3 to 5 hours, so without a constant stream of caffeine headaches could come in before too long.