​Detective Senior Constable Tim Chester, of the Portland police crime investigation unit, said a male customer came out of the south Portland pharmacy carrying prescription medication at 8.40am.

"He was approached by an unknown man, a wrestle took  place and some of medication - pain relief - was taken," he said.

"The offender was described as 175cm tall, skinny, Caucasian and wearing a light coloured hoodie. There were people in the area and we would like to hear from witnesses." 

Anyone with information is requested to contact the Portland police station or Crime Stoppers on 1800 333 000.