Schapelle Corby has alarmed prison doctors in Indonesia after swallowing nearly a week's worth of medication in one hit.
Corby, whose medication dosage is controlled by authorities at Bali's Kerobokan prison, did not take enough to overdose and she did not require hospital treatment.
The 34-year-old Gold Coast woman is taking anti-depressants but it is not clear which medication was involved in this latest incident, which left the convicted drug smuggler in a state of drowsiness.
Her sister Mercedes, who has been visiting Corby every second day, insists the incident was not a suicide attempt, but maintains her sister is suffering psychologically.
Schapelle Corby has been in jail since 2005 and faces another 11 years of prison life at Kerobokan.
Her sentence was reduced by five months last month to coincide with Indonesian Independence Day celebrations.