Only licensed disposal locations can dispose of medications (certain medications are hazardous substances and actual fall under a different category: nitro, chemo drugs, certain specialized leukemia meds, etc and must be given to a special hazardous chemical truck that makes the rounds yearly).
These sites are licensed by the and monitored by the DEA (https://www.deadiversion.usdoj.gov/drug_disposal/takeback/index.html).
You can go here to find a site or service or call your police station.