52 yo F with a 36 year history of migraine. Has had good control with topiramate 100 mg daily and as needed treatment for breakthrough attacks with rizatriptan 10 mg. Recently diagnosed (in past month) with stable coronary artery disease. Cardiology recommends discontinuing the rizatriptan. She only needs to use the rizatriptan around 3 times per year a long as she is on her daily topiramate. What does the audience suggest I use to replace the rizatriptan for acute breakthrough that has no risk of coronary vasospasm? She has HMO type insurance with many restrictions.