You may experience some or none of the rizatriptan side effects explained above. Unfortunately, there is no way for your healthcare provider to know beforehand if you will have side effects from a medicine that you have never tried. Therefore, be sure to let your healthcare provider know if you develop any side effects while taking rizatriptan. Also let your healthcare provider know if you develop something that "just does not seem right" during treatment with the drug. While it may not be a rizatriptan side effect, your healthcare provider will be able to diagnose and treat the problem.