Taking medicine on time every day replaces the medicine that your body has used up since the last dose. Taking medicine on time keeps a steady level of the drug in the body. All medicines have what they call a half-life. In pharmacology, the half-life is the time required by the body, tissue, or organ to metabolize or inactivate half the amount of a substance taken in. This is an important consideration in determining the proper amount and frequency of dose of drug to be administered.
Mostly it is medicines that help keep you alive that it's imperative to take on time such as medicine for seizures, asthma, diabetes, heart medications, birth control pills (for obvious reasons)etc.
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Reason for taking medication at *exact* time each day? 
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