As part of a crackdown on the illegal sex drugs trade, Medicines Enforcement Officials from the Department of Health, Social Services and Public Safety visited several 'adult shops' in the city centre on Tuesday.
Supported by the PSNI, officers seized £25,000 worth of illegal drugs.
Peter Moore is Senior Medicines Enforcement Officer with the Medicines Regulatory Group of the DHSSPS.
"These seizures demonstrate that we are committed to pursuing those involved in the illicit supply of prescription medicines and taking action to ensure the public is protected," he said.
"If you buy a medicine from unregulated High Street sources like these, you very well may be receiving a product that is unlicensed, fake or could react adversely with any other medication you take."
He warned: "My advice to the public is that they should speak to their GP or pharmacist who can advise them on the best treatment for their condition.
"Only healthcare professionals can take into account risks and benefits associated with every medicine."
Professor Mike Mawhinney, Head of the Medicines Regulatory Group, added: "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 these seizures show our determination to stop this kind of illegal activity."