Halloween’s annual trick-or-treat walk has ended in a hospital visit for a three-year-old Victorian girl.

Victoria Police said toddler Abbey fell ill while trick-or-treating on Hallets Way in Bacchus Marsh on Thursday, after possibly ingesting prescription medication.

Police are investigating how the incident occurred as there were no similar reports in the area.

Abbey spent the night in hospital but was back at home by lunchtime on Friday, going through her Halloween bucket of lollies.

HALLOWEEN SCARE: Abby has returned home from hospital and is inspecting her bucket of treats she was given while Trick or Treating last night. The 3yo was rushed to hospital after she was given Seroquel – a medication to treat bipolar @7NewsMelbourne @7NewsAustralia pic.twitter.com/Z0ZBzPVgY9

— Cassie Zervos (@cassiezervos) November 1, 2019

On Thursday night about 8pm, the child’s mother noticed that the little girl was not well and an ambulance was called and she was taken to Sunshine Hospital.

Police said investigators have been told that the child might have eaten prescription drug.

Her mother, named only as Tara, told the Nine Network her daughter was “zonked and wobbly on her feet”.

The girl found tablets, believed to be Seroquel, which is used to treat bipolar disorder and depression, in a zip-lock bag in her Halloween bucket, Nine reported.

“At this stage in the early investigation, it is not believed there is any malicious intent surrounding this incident,” a police spokesperson said on Friday morning.

“Police are treating this as an isolated incident and have not received any other reports of any similar incidents in the area.”

Police are continuing to investigate how the incident occurred.

There have been no similar reports in the area.

7-year-old girl shot in chest while trick-or-treating

3700 block of West 26th Street, Chicago –

coverage: https://t.co/M6S3wNtMmF pic.twitter.com/Jp4VkbAlZE

— john j. kim (@jkimpictures) November 1, 2019

Meanwhile, in the US, a seven-year-old girl is in a critical condition after being shot by a stray bullet while out trick-or-treating with her family in Chicago.

Police spokesman Anthony Guglielmi said the girl was thought to be an unintended victim after being shot in the upper chest. He said members of the community were helping police “but we need more”.

Police said a group of men were chasing another male along the street when someone in the group fired at the intended victim.

It was not immediately known if a man who was also wounded was with the girl or was the one targeted by the shooters.

“This is unacceptable,” Sergeant Rocco Alioto said.

“A seven-year-old girl that was trick-or-treating with her family had to get shot because a group of guys want to shoot at another male.”