Certain medicines are best taken at specific times. Some are advised in the morning because they can disturb sleep, while others are taken at night because they cause drowsiness or work better overnight. Some need to be spaced evenly to keep a steady level in your body.
For many everyday medicines the exact clock time is less important than taking them consistently and at the right spacing. Keeping a regular routine, such as linking doses to meals or bedtime, helps you remember and keeps the medicine working steadily.
If you are not sure whether timing matters for your medicine, or you need to shift your schedule, ask your pharmacist. They can tell you whether the time of day affects how well it works or how you tolerate it.