When people with early Alzheimer's take rapamycin once a week, the drug stays in their body about as long as it does in other groups — around 69 hours — which means it leaves the body at a similar rate even with weekly dosing.

Taking a weekly 7 mg dose of rapamycin for early Alzheimer's doesn't vary too much from person to person, so doctors might not need to adjust doses or monitor blood levels in future studies.

For people with early Alzheimer’s taking a weekly 7 mg rapamycin pill, checking their blood 48 hours after the dose gives the most consistent results and best predicts their baseline levels—so that’s the best time to test it.

People with early Alzheimer’s who take 7 mg of rapamycin every week seem to have low levels of the drug in their blood before their next dose—so low that it probably won’t weaken their immune system.

A drug called rapamycin helped mice live longer - males lived about 9% longer and females lived about 14% longer when they started taking the drug in late adulthood.

Scientists gave mice a drug called rapamycin when they were middle-aged (around 270 days old) and found that both male and female mice lived longer compared to mice that didn't get the drug.