Final answer:
If your prescription reads "q.i.d." it means you need to take your medication four times a day.
Step-by-step explanation:
If your prescription reads "q.i.d." it means you need to take your medication four times a day. "q.i.d." stands for "quater in die" which is Latin for "four times a day". This means you should take your medication at regular intervals throughout the day, such as once every six hours.