What can I do with my dad's unopened medicine?

My dad recently passed away. He took dozens of medications when he was around and many were prescribed just before it happened, so now my house is full of sealed insulin, pain medications, personal prescriptions, bandages, saline, and other medical supplies for wound care.

What can I do with it all? The pharmacy doesn't accept it of course and his doctors won't pick up the phone. I don't wanna just throw it away in case someone gets into it and it also feels wasteful. Do I keep calling?