I take prescription meds as well as vitamins and have always used a weekly pill container and never had any problems.
Mike is right though, always carry prescription meds in your carry-on luggage in case your other luggage gets lost.
I also carry the labels of prescription meds just in case. They came in handy once when the Dr. onboard needed to know what to treat me with when I had an attack of Arrythmia!
donna