Dr here, it’s because drugs have an optimal live during the blood streams, lets say 8hours… if you take pills too early it is more easy for you to have side effects because the dose accumulates, in the other hand if you take pills too late the effect will be sub-therapeutic (not very effective).
Btw, NEVER take 2 pills at the same time (more pills= bad), if you forget a dose, just take the pill you forgot and wait for the next time
For more info just google therapeutic curves
Sorry for my English 🙂
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