The rule for travel is to carry everything in its original, clearly labeled bottle. All prescriptions should have the prescription label on them (you can often get pharmacists to fill a smaller size bottle for you for travel), and any OTC drugs or supplements should be in the correct container, ideally with a DIN on the label. It's a pain, but it prevents a lot of issues going through security. Unlabeled tablets tend to get confiscated and may get you pulled in for further examination.
And of course, all liquids have to follow the 100 ml rule.