If you have a number of different medications to take throughout the day you may find it helpful to use a timer, rather like an alarm clock, which will remind you take another dose.
You can also buy various types of tablet organisers that have a compartment for each day which can be very useful to keep with you if you are going out. For advice on this speak to your pharmacist or look on-line, for example the Disabled Living Foundation website or commercial companies such as Tabtime.