Kreosotum is most often used for the menstrual problems of women and in little children for colicky, teething problems.
It is renowned for helping all sorts of burning, acrid disorders. So this might be stomach disorders which results in vomiting, or diarrhea which excoriates the buttocks.
If menstruation is difficult think of this remedy if he sufferer feels great weakness, is swollen and the flow is copious. Occasionally the blood itself may be very dark, if not black, in colour.
Weakness during menstruation
Colic
Diarrhoea
Vomiting
Menstrual problems
Teething