pain
"As a pharmacy technician, the advice in this column recommends that unused portions of the drug should be flushed in the toilet.  This is an incorrect myth.  Drugs flushed in the toilet can contaminate our resources and water supply.  Any drugs not used should be turned into a pharmacy so proper disposal can be taken care of.
***
Editor's Note - Only about a dozen drugs, such as powerful
narcotic pain relievers and other controlled substances, carry instructions for flushing to reduce the danger of unintentional use or overdose and illegal abuse.
The FDA worked with the White House Office of National Drug Control Policy (ONDCP) to develop the first consumer guidance for proper disposal of prescription drugs.
See http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm101653.htm"