"I'm not feeling my high," pharmacist Sylvia Choi told her boyfriend after she ingested something at Stereosonic musical festival.

Five hours later, the 26-year-old from Oyster Bay in Sydney's south, was dead.

Now the close high school friend who supplied her with a "yellow Snapchat" ecstasy pill and an MDMA capsule has been sentenced to a minimum of six months in jail.

Physiotherapist Daniel Dung Huynh, 26, stared straight ahead after magistrate Michelle Goodwin read out the one-year maximum sentence at Burwood Local Court on Monday.