The agency said the 196 billboards in and around London advertising the products of the Advanced Medical Institute, which was banned from executing a similar ad campaign in its native Australia, prompted 249 complaints in only eight days, The Daily Mail reported Friday.

A spokesman for the authority said the number marked a "high volume" of complaints for a "short space of time."

The advertisement reads: "Want Longer Lasting Sex?"

Smaller print at the bottom of the ad invites consumers to "call the doctors at the Advanced Medical Institute" for more information on the "nasal delivery technology."

The ADA said the complaints sparked an investigation into the ad campaign.