A woman guest found a tranquiliser in her dessert at a dinner party thrown by a journalist, a court has heard.
The guest, identified only as Miss Y, accused Christopher Davies, a former sports reporter with the Daily Telegraph, of trying to drug two women.
Miss Y became suspicious when one of the women became "violently ill" after dinner, Croydon Crown Court heard.
Mr Davies, 58, of Bromley, south-east London, denies trying to drug two women with the intention to have sex.
'A bit strange'
Jurors heard the freelance writer invited three female colleagues to his home for a dinner party in January 2006.
During the evening Miss Y said she found a bright blue tablet in her chocolate dessert, which was later found to be Valium or diazepam.
She told the court: "I broke a bit in half with my spoon and bit it off. 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.
But Mr Davies told the court he had been prescribed the drug to cope with the stress of his dying father and if any had got into their food it was purely accidental.
He said that during the party he felt unwell and cut a tablet in half with a pair of kitchen scissors.
"I was aware that a fragment of the tablet had pinged off somewhere. It was an inadvertent act. I could not see where it landed," he said.
Mr Davies said he had checked on one of the women during the night as she had been sick and he was concerned she may choke.
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.
The trial continues.