"I looked inside and could see a blue bit and thought it looked a bit strange."
She put the pill in her handbag and took it to the police station for testing after she heard her friend - referred to in court as Miss X - fell sick and "slumped" in a chair after dinner at the party.
"When Miss X became sick, that's when alarm bells started ringing," she told the trial.
Mr Davies told police that he had been prescribed the drug after being diagnosed with a serious illness.
He added that during the party he felt unwell and cut a tablet in half as prescribed and that the other half may have accidentally fallen into Miss X's dessert.
He denies two charges of administering a poisonous or noxious substance with intent to injure, aggrieve or annoy and two counts of administering a substance with intent to engage in sexual activity.
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