Catherine Hudson, 54, was found guilty of administering unprescribed sedatives to two patients over the course of 21 months.
She was also found guilty of conspiring to deliver a sedative to a third patient with her colleague Charlotte Wilmot, 48.
Cops said they committed the offences in 2017 at the Blackpool Victoria hospital in Lancashire for their “own amusement” and “to spite the patients.”
Hudson boasted in a text exchange that she’d drugged a patient “within an inch of her life,” adding, “Bet she’s flat for a week, ha ha.”
She utilised a variety of medicines, including the insomnia medication zopiclone, which can be fatal if administered incorrectly.
The offences were committed between February 2017 and November 2018.
Prosecutor Peter Wright KC said they treated patients “with contempt”.
Judge Robert Altham remanded Hudson into custody following the verdicts, which were reached after nearly 14 hours of deliberation, and told her she faced jail.
Wilmot, an assistant practitioner, was granted bail and was told the “overwhelming likelihood” was that she too would be caged.