How much imitrex (sumatriptan) is too much? in an average month i have to take around 12 doses. could this have harmful effects?

Max = 200mg per day: You can take up to 100mg of Imitrex (sumatriptan) by mouth for migraine headaches and then repeat it again in 2 hours if the headache recurs for a maximum of 200mg by mouth every 24 hours. Any medication could have harmful effects, especially if you overdose. If you feel Imitrex (sumatriptan) isn't working for you, there are other options available. I recommend talking to your doctor for more information.