From: Alan Meyer on
Some new experiments with mice appear to show that prostatic
acid phosphatase, injected into the blood stream, is 8 times
more effective than morphine and a single injection lasts
for three days.

As always with mouse studies, there's a ton of work to do
before we know whether this works in humans and is safe.

http://www.medgadget.com/archives/2008/10/prostatic_acid_phosphatase_may_one_day_replace_morphine_for_pain_control.html