Health officials warn the public not to buy medicine from unregulated sources after police seized a large amount of drugs from two houses in Portadown.
PSNI officers, in partnership with the Department of Health, searched two homes on Friday where they recovered the drugs.
Sergeant Victor McNeill said: “We recovered several thousand Class B and C tablets including codeine phosphate and diazepam along with documentation and a computer."
A 63-year-old man was arrested for possession of the drugs and with intent to supply, but was released on bail pending further enquiries.
The Department of Health's Peter Moore, Medicines Regulatory Group Senior Medicines Enforcement Officer, advised people not to buy unprescribed medication unless it follows a consultation with a GP.
Mr Moore said: “When you buy a medicine from an unregistered website or an unregulated source, you will never know the conditions that product has been made in. On top of that, you very well may be receiving a product that is fake or reacts adversely with any other medication you take."
He also encouraged the public not to fund a crime by purchasing medication from an illicit source.
Professor Mike Mawhinney, Head of the Medicines Regulatory Group, said: “The Department has made it very clear that it will continue to be vigilant and proactive in the regulation of medicines in Northern Ireland and this investigation clearly demonstrates our determination to stop this kind of illegal activity.”