Mefenamic acid
"My pain usually starts 3-4 days before my period actually comes. Tylenol#3 is the only thing that still helps me function normally during this time of month. Dr gave me mefenamic to try this time. After taking this, my pain is not only in my lower back but also pain and intense cramping in uterus...this stuff doesnt help my issues at all, if anything made it worse!"