Several things could still prevent the drug from making the leap from killing pain to treating cancer.
One criticism of the Cox-2 class so far has been that these drugs are no better at killing pain than ibuprofen.
Murray had been accused of being a "drama queen" by former tennis star Virginia Wade after receiving lengthy on-court treatment during an earlier match against Jarkko Nieminen, but revealed he had refused pain-killing injections to counter the back pain he has been suffering since the start of this year.
There are exceptions to this: you may have paid for those pain killing drugs but woe betide you if you try to sell them.
He was given a pain-killing injection during Durham's 232-run County Championship defeat by Lancashire.
At issue, too, is whether enforcement of Mr Ashcroft's ruling will lead doctors to prescribe pain-killing drugs more cautiously.
He will have pain-killing injections for a bruised ankle bone before Sunday's cup final, but said he would be fit for the game in Seattle.
Gerrard took pain-killing injections to play against Chelsea two weeks ago, but Liverpool boss Rafa Benitez did not risk him against Sunderland and Toulouse last week.
Last year he also called on the UK government to licence the opium poppy trade in Afghanistan, to help combat a world shortage in the pain-killing drug morphine.
They slumped to 95-4 before Kamal, who took a pain-killing injection at the crease to treat an injured elbow, put on 81 for the sixth wicket with Yousuf Youhana, who made 48.
Sergio Aguero, the club's top scorer, was sidelined with a freak injury: A trainer had applied a pain-killing spray to his foot and his skin reacted by exploding in a hail of blisters.
"I was struggling in the first half with a sore Achilles and I wasn't sure if I would make it to half-time to see the doctor and get a pain-killing injection, " Henson explained.
The current British number 10 says her back has been holding up well since January although she had an epidural injection in March and accepts she may need further pain-killing treatment in the future.
Curry took a pain-killing injection before the game for the first time in his career, though he looked slow early and even covered his head in a towel on the bench late in the first quarter.
The FDA, he said, had ignored warnings that the pain pill Vioxx was killing people by causing heart attacks and strokes--and he said the agency was incapable of defending the public against another drug disaster.
It is often argued that the distinction between curing and killing is blurred in any case: doctors frequently prescribe increasing doses of opiates which, as well as relieving pain, will advance the death of a patient.
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