Hello and welcome to HCM,
The menstrual cycles can vary in duration from 2-7 days and in amount from scant to heavy flow.
These variations are seen in healthy menstruating females.
There is nothing to worry about the variations.
Pain during menstrual cycles can be severe and cramping.
Mafenemic acid is a common drug prescribed for dysmenorrhea (pain during menstruation
It can be taken whenever you experience the pain.
3-4 doses can be taken after you experience the pain.
Thanks and take care
Dr Shailja P Wahal