District Collector Veeraraghava Rao told reporters that the seizures were made during vehicle checking.
Three companies of paramilitary personnel would be on security duty for the by-poll from today, he added.
The by-poll to Thiruparankundram was necessitated following the death of AIADMK's Seenivel who had won the seat in the May 16 polls.
Meanwhile, a case has been registered against DMK candidate Saravanan for allegedly distributing money among voters.
The Model Code of Conduct is in effect throughout Madurai district, though the by-election is slated to be held only in Thiruparankundram Assembly constituency.