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The maths for half-life of drugs is identical to that for
radioactive decay.

Make a table of days against tablets and each day add up the remaining levels for all drugs taken thus far. Thus, on the $n$th day there will be the effect from $n$ tablets to add up. You should do this numerically.

Make a table of days against tablets and each day add up the remaining levels for all drugs taken thus far. Thus, on the $n$th day there will be the effect from $n$ tablets to add up. You should do this numerically.