memory in older adults. choosing a treatment for your chronic migraine - 15 or more headache days a month, each lasting 4 hours or more - can be overwhelming. so, ask your doctor about botox®. botox® prevents headaches in adults with chronic migraine before they even start. it's the #1 prescribed branded chronic migraine treatment. so far, more than 5 million botox® treatments have been given to over eight hundred and fifty thousand chronic migraine patients. effects of botox® may spread hours to weeks after injection causing serious symptoms. alert your doctor right away, as difficulty swallowing,