Naproxen I cant believe I've actually found a drug seems to work on the severe period pain I sometimes get (I've only tested it on two of my periods so far but it certainly seems to help as the pain soon after completely went (once it took 45mins after taking it, the other time 3 hrs before pain went). I previously was taking high strength doses of both asprin and panadol combined, which usually wasn't enough. Then my dr put me onto Postan (mefenamic acid) for the severe period pain which I was taking with another pain killer but still had severe pain at times to the point I was still having to sleep in hot bath to try to get pain levels down enough to even be able to sleep. The Ponstan I don't think even worked as well as high strength asprin. Next drs suggestion was either some of those addictive pain killers or Naproxen.. of cause I opted to try the Naproxen first. To my amazement after those other things failed, this worked and I've been so far able to take it "alone" and it completely relieves my period pain! "Naproxen is in a class of drugs called non-steroidal anti-inflammatory drugs (NSAIDs), which work by blocking the production of prostaglandins, substances in the body that play a role in pain and inflammation." " Prescription-strength naproxen is often used to treat joint pain, menstrual pain, rheumatoid arthritis, gout, ankylosing spondylitis, juvenile arthritis, tendonitis, and bursitis. Nonprescription naproxen is commonly used to relieve pain, swelling, fever, cold and flu symptoms, and headaches." http://www.everydayhealth.com/drugs/naproxen The Naproxen in Australia is called Inza (I take a 250mg dose when needed.. actually two of these the first time I take it). Anyway, I just wanted to share this as period pain is horrid and I suspect there must be others here who have tried various other things for this without success.