You have a period of acid dump from 2 am till about 7am. That is the period of maximal acid dump at night. So, if the drug is in the bloodstream for a maximum of ~2hrs (remember the absorption occurs after ~1.5hrs so, from the 1.5hr mark forward for ~2 hrs you have coverage for any acid being made. So let's say you time it perfectly and give the dose at 1/2 hr after midnight so that the drug would be in the blood stream at 2 am (it takes 1.5 hrs to get absorbed) Then at 2 am you would have drug present for 2 hrs - till 4am. Then no drug - but body still making loads of acid (nocturnal acid). From 4 am on there would be no protection from acid
The acid pumps (called proton pumps) are in the acid making cells (called parietal cells). They make acid when signaled to do so. They are signaled to make acid after you begin eating (mainly by food or milk which raises the pH in the stomach). After your evening meal they go dormant till approx 2am, then they come on and make a large amt of acid. This is because long ago we did not cook things well (no stoves existed, hardly any fire existed) and the large meal of the day was at night then you went to sleep. During the night your body would make a lot of acid to kill the bacteria you ingested (that is how you lived through the night-in essence). So we still have that 2 am to 7 am acid dump.
The other thing you have to know is a little PPI pharmacology - PPIs can only turn off acid pumps that are already on. So if the pumps are not on (in the resting phase) and you take a PPI (that does not have a buffer) then the PPI will get absorbed and when the PPI gets to the parietal cell it will find no acid pumps that are on and it will not be able to shut off any pumps and the PPI will be removed from the body (just as all drugs are removed from the body) through metabolism and elimination. If you take the PPI in an immediate release form with a buffer, then the buffer will turn on a large quantity of acid pumps and they will all get shut off by the PPI. Then later in the early morning hours when the body tries to make the nighttime acid dump (there will be no acid pumps remaining) - so no acid dump.
See how amazing the body is
from midnight to 3 am for the beginning of nighttime acid dump.
The studies were performed (not by me) but over hundred's of studies who look at the baseline pH (before treatment) and then after treatment. So all this baseline data exists and in the observation of these baseline data. And it was observed (quite obvious) that there was all this nighttime acid.
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