... to obtain therapeutic effect?
Different drugs work in different ways. Some dont stay in the system very long or are metabolized quickly and need to be taken more often, others stay in the blood longer and take longer to metabolize. Some drugs are formulated to be long acting. The drug may actually be a short acting drug but due to the formulation of the pill it is designed to break down slowly-these are usually labelled as CR, LA, ER, XL etc.. There are many variables as to why you need to take one drug more often than another so it would be helpful to know what drugs you are speaking of.
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