Small, Pale Yellow Pill With 50 On One Side And Completely Blank Of The Other?

Updated
Molly Says:

I found these pills in the med cabinet in my house. I'm guessing they are some old pills my parents had but I was just curious of what they could be. I found them in a small brass like tube with a twist lid made by a company called F.Faber so that is of no help for me. I just want to make sure that parents didn't have any, problems before seeing as they both were very into the Punk scene.