I tend to use expired medication. Sometimes it is less potent but depending on what it is, sometimes it is perfectly fine.
I see a lot of people here with old meds that they don't know what to do with. I don't think you can do anything useful with the unused portion unless you know someone who needs them. It could be a liability to give them to someone you don't know well, what if they say the drugs you gave them caused them some kind of sickness? It is definitely risky to give people medications but a very generous idea on your part. It's a shame to throw drugs out when you know someone out there is probably very sick and can't afford those same medications. At the same time, they are pills that have next to no real value except to those of us who need them. Kind of messed up. I am lucky I get drugs for free. I hate paying 100s of dollars for a capsule full of chemicals that cost nothing to produce.
Diagnosed with mild proctitis in March 2007: Treated with Canasa (as needed)
December 08: Began treating with Asacol 400mg (9/day) + Canasa 2x/day - Anemic
May 09: Off Canasa, taking Asacol (9/day)
Back on Canasa every other night + Asacol (9/day) + Probiotics + Iron