If a drug had a half life of 4 hours how long would it compl

If a drug had a half life of 4 hours how long would it completely take to eliminate out of the body

Solution

The drug that had a half life of 4 hours would take 4* 5 = 20 hours to completely eliminate out of the body.This is according to the Rule of 5 i.e elimination of a drug from the body is 5 times the half life of the drug.