Medicine to stop excessive bleeding during...

Medical treatments for heavy or long period :
various options could be used , here are some :
Progestine pills which help to make the uterine lining thin thus reduce the bleeding , example of which are Provera pills 
Antifibrinolytic  drugs such as tranexamic acid which works by slowing the bleeding via its effect on the clotting system
Nonsteroidal anti-inflammatory drugs such as Naproxen or Ibuprofen which help to reduce the cramps and bleeding
diagnosis :
based on medical history and physical examination including pelvic exam ,then running some tests such as CBC to look for Anemia , Iron level and Thyroid function tests , pelvic ultrasound to check for any defect of uterus and ovaries, endometrial biobsy , and hysterscopy 
advice:
if you are thinking of getting pregnant in the next months ,you should use NSAIDs or Tranexamic acid to reduce the bleeding