" I’m about to start 2.5mg/day for breast cancer, and would like to continue my CBD regimen. Is it better to take them at different times of the day?"
The adverse interactions of Medical Cannabis with other pharmaceutical drugs are relatively rare. There have been very few adverse interactions reported. I would recommend for you to continue your CBD regimen as you normally would. Also, I suggest you collaborate with your primary care provider, in order to monitor the effects as an extra safety precaution.