Can you put new liquid medicine in old medicine bottles? is this safe? recommended?

This : This is not a good idea because there can be an issue of confusion. For example the name of the drug, directions, and expiration date can be confused by someone if the bottle has been changed. Even if it is the exact same medication, this is not a good idea because of the issue of expiration date. Try to keep all medications in the original packaging/bottles.

Not a good idea: I agree with Dr. Jackson. This is NOT recommended. It could lead to confusion.