More than 1,300 pills were seized after cops raided a house in Grangemouth yesterday.
Officers were sent to the address on Bowhouse Road at around 1pm, after a tip off from a member of the public.
The tablets have been sent away to be examined at a specialist lab as police try to establish what they are.
No arrests have been made.
A Police Scotland spokesperson said: "Drugs were recovered in Bowhouse Road, Grangemouth, after a phone call from the public about dealing.
"Over 1300 pills were seized, and currently awaiting lab analysis.
"Great result by Grangemouth Community Cops and we'd like to thank the public in helping remove drugs from our streets."
