Health authorities have stopped the sale of paracetamol on the streets of Suva.
This follows a disciplinary caution by the pharmacies board to wholesalers and retail pharmacies who were supplying bulk medicine to street vendors.
Health Minister Doctor Neil Sharma confirmed all wholesalers and pharmacies were issued caution letters.
He said if they did it again, they would face disciplinary actions.
However, Dr Sharma said the problem was not confined to Suva.
"People need to be ethical about what they do. Retailers should not be selling paracetamol in bulk to street vendors."
A statement from the ministry said pharmacy wholesalers and retailers were breaching codes of conduct, ethics and the law by wholesaling to the general public.
"Strict measures apply to such medicinal items as side-effects and toxicity can result in patient harm," the statement said.