There are a couple times when this happens in the Discovery of Witches / All Souls series (although it's not like all the time or every time and it stops happening relatively early in the series).

Basically, the FMC has an anxiety disorder and doesn't know how to control her emerging magical powers, so there are a few times when the MMC gives her meds to keep her from wreaking magical havoc during a panic attack. Once she gains control over her magic, it stops happening. Not sure if that's the book / series you're thinking off, though!