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A member asked:
Isn't the half life of topical minoxidil like 20 hrs.? if so why does it need to be used twice a day?
A doctor has provided 1 answer
Levels may vary: Half life generally refers to the amount of time it takes to eliminate 50% of a drug from your system. However, this does not correlate with the amount that is needed to be therapeutically effective. For a given drug, that amount needed to be therapeutically effective may be more than or less than the amount present when 50% has been eliminated. In addition, the topical minoxidil is locally active
Answered 12/8/2016
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