MIAMI -

The U.S. Drug Enforcement Administration said about 8.5 tons of prescription drugs were collected in Florida during the most recent drug "take-back" day.

The DEA said Thursday that the event last Saturday involved 164 collection sites across the state. People brought in prescription drugs that were no longer wanted or had expired.

Nationwide, the DEA said about 324 tons of drugs were collected.

In the seven drug collection events held so far, Floridians have disposed of 52 tons of unwanted medications.

Miami DEA Chief Mark R. Trouville said the initiative is aimed at preventing prescription drug misuse and abuse.

Prescription drugs are abused in the U.S. more than cocaine, heroin, hallucinogens and inhalants combined, officials said.  The DEA said most of those abused drugs are obtained from family and friends.