New Scientist reports on an advancement in painkillers which might seem hard to swallow:

Saliva from humans has yielded a natural painkiller up to six times more powerful than morphine, researchers say.
The substance, dubbed opiorphin, may spawn a new generation of natural painkillers that relieve pain as well as morphine but without the addictive and psychological side effects of the traditional drug.

On the downside, it kind of gives new meaning to "lohesh 'al hamaka" (M. Sanhedrin 10:1), so if you're planning on taking this, just don't say anything.