Older adults taking a weekly 6 mg dose of sirolimus while exercising for 13 weeks may have more side effects overall than those taking a fake pill, including a serious lung infection like pneumonia, even though about the same number of people had side effects in both groups.

Taking a weekly 6 mg dose of sirolimus seems to be safe for older adults (65–85 years old) if they also do light home exercises for 13 weeks — most side effects were caught through check-ups and self-reports, but the study was too small to catch very rare ones.

Older adults who take a weekly 6 mg dose of sirolimus while exercising might see slightly less improvement in hand strength and walking ability compared to those taking a fake pill — suggesting the drug could be limiting some of the usual benefits of exercise.

Taking a weekly low dose of a drug called rapamycin while doing a 13-week home exercise program might help older adults (65–85 years old) get stronger legs — but we’re not totally sure how much it helps because the study was small and short.

Taking a weekly 6 mg dose of the drug sirolimus doesn't help older adults get extra benefits from exercise — and might even cancel out some of the gains they'd normally see.

Taking 6 mg of sirolimus once a week might help reduce signs of aging and inflammation in older people, but we’re not sure yet and need bigger studies to confirm it.