If Medication Causes Hair Loss, Why Won’t Stopping the Medication Regrow the Hair?

In a previous post a man had asked if off Nexium, will the hair grow back that was lost as a side effect and this site’s response was that it probably wouldn’t. My question is why? If a medication contributes to it and you get off that med and allow enough time for the body to fully release it from the bloodstream and wherever else, shouldn’t the side effects reverse? For instance when patients are on chemo and lose their hair. It grows back afteward.

I just wanted some clarification on this issue since I’ve been dealing with hair loss from Nexium after months of usuage and am now off it for about 2 weeks now (which I know is too soon anyways to see progress).

Thanks

We really do not understand the mechanisms that cause hair loss with drugs and some diseases. It is like pulling the trigger of a gun — once the bullet leaves the barrel, the bullet will do its damage. This is like a switch that is flipped and we know little as to why it does not reverse when the insulting drug is removed.

Actually, in some lucky people hair does regrow, so cross your fingers that you are one of the lucky ones.