The timing will depends on the type of drugs the patient had
It should be written on the bottle or the label and the patient just have to follow them.
Some medications will tell you that "Take 1 Capsule in the morning and 1 apsule before bed time"
Other type of medication may tell you that "take 1 - 2 tablets as needed for pain" , that mean that you could only take that if you feel any pain, no prefixed schedule necessary