Key takeaways

  • Studies suggest that rapamycin may extend lifespan, but there’s limited research on its effects in humans.
  • There’s no FDA-approved dosage for longevity, but people taking rapamycin off-label often use 5 to 7 milligrams (mg) once per week or 10 to 15 mg every other week.
  • Most doctors won’t prescribe rapamycin for longevity, but functional or integrative medicine specialists may prescribe it off-label.

Rapamycin, also called sirolimus, is an antibiotic originally used as an antifungal treatment. Some experts now believe it can target the biological processes that cause us to age.

Rapamycin belongs to a class of drugs known as mTOR (mechanistic target of rapamycin) inhibitors. mTOR tells your cells when to grow, divide, and when to clean up waste through a process called autophagy.

Scientists have seen rapamycin extend the lives of mice and other animals, but there is a lack of good-quality research into its effects on longevity in humans.

Rapamycin is available as the brand name drug Rapamune, which is FDA approved to help prevent the rejection of kidney transplants and to treat a lung condition called lymphangioleiomyomatosis (LAM).

As the Food and Drug Administration (FDA) has not yet approved rapamycin for human longevity, there is no officially recommended dose.

However, in people who have taken rapamycin “off label” for longevity, weekly or fortnightly dosing is a common approach. Dosages may be as follows:

Taking the drug in one “burst” inhibits mTOR enough to be effective, but gives the body time to prevent the worst side effects, such as digestive issues.

A 2025 study suggests that the right dosage of rapamycin may vary based on people’s individual responses. Researchers found significant differences in rapamycin levels in people’s blood when they took the exact same dose. They suggested this was due to variations in genetics, diet, or metabolism, or a combination of all three.

So taking rapamycin for longevity may require individualized dosing and regular blood tests to monitor levels. Simply taking a standard dose may not be effective or safe for everyone.

Rapamycin requires a prescription, but most doctors will not prescribe it for longevity. However, doctors who specialize in functional or integrative medicine may prescribe it off-label for this purpose.

There are also telemedicine platforms that connect you with a doctor. They will evaluate your health factors and weigh up the health benefits and risks of you taking rapamycin.

You’ll typically need blood tests before a doctor prescribes the drug, and regular blood tests to monitor its effects.

If you’re considering taking rapamycin for longevity, talk with your doctor about the benefits and risks. They may refer you to a longevity specialist for tailored advice.

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