My girlfriend is director of nursing in a nursing home here in MA. The medications should be crushed or diluted in coffee grounds or kitty litter and placed in a sealed container. The nursing home has access to Bio-Hazard containers, but for the general public,I would handle them as above, then drop them off at a local center for disposal of hazardous wastes. Your local town hall should know when the disposal will take place, then you can drop them off, but don't flush them down the toilet.