Compo, this is from the NHS website - about nurofen reducing flow
Non-steroidal anti-inflammatory drugs (NSAIDs) may also be used to treat menorrhagia as a second choice treatment if LNG-IUS is not appropriate.
NSAIDs have been shown to reduce blood loss by 20-49%. They are taken in tablet form from the start of your period (or just before) and until bleeding has stopped. As with tranexamic acid, treatment should be stopped if your symptoms have not improved within three months.
The NSAIDs that are recommended for treating menorrhagia are:
mefenamic acid
naproxen
ibuprofen
These are usually taken three or four times a day.
NSAIDs work by reducing your body's production of a hormone-like substance called prostaglandin, which is linked to heavy periods. NSAIDs are also painkillers. They are not a form of contraceptive. However, if necessary, they can be used with the combined oral contraceptive pill (see below).
Common side effects of NSAIDs include indigestion and diarrhoea.
NSAIDs can be used for an indefinite number of menstrual cycles, as long as they are relieving symptoms of heavy blood loss and are not causing significant adverse side effects. However, treatment should be stopped after three months if NSAIDs are found to be ineffective.