Rapamycin, infections and vaccines: what changes at longevity doses

Two very different ways of using the same drug

After a kidney transplant, sirolimus is taken every day, usually alongside other immune-suppressing drugs, with blood levels kept in a set range. That steady suppression is the point: it stops the immune system attacking the new organ. The Rapamune label warns that it increases susceptibility to infection and the possible development of lymphoma and other cancers, and MedlinePlus notes it can make infections harder to fight.

Longevity regimens are different. Doses are lower and usually taken once a week or on another intermittent schedule, leaving time between doses for blood levels to fall. The theory is that this pattern dials down mTOR activity enough to nudge cells toward maintenance and recycling without the sustained immune suppression of transplant dosing. That theory is still being tested.

What the human data show so far

The most relevant trial is PEARL, published in Aging in 2025. Healthy adults took 5 mg or 10 mg of compounded rapamycin weekly, or placebo, for 48 weeks. Overall and serious adverse events were similar across all groups. The study was not large enough or long enough to detect rare infections, and it used a compounded product that may not behave identically to FDA-approved sirolimus.

Earlier research on a related mTOR inhibitor, everolimus, given for a few weeks to older adults before a flu shot, suggested antibody responses might actually be somewhat better, not worse. These findings come from small studies of a different drug and a short course, so they are hypothesis-generating rather than a reason to take rapamycin around vaccinations.

Vaccines

• Avoid live vaccines while taking sirolimus; the label lists examples including MMR, varicella, yellow fever, oral typhoid and BCG
• Inactivated vaccines, such as flu shots, are generally fine, but the label notes immunosuppressants may make vaccination less effective
• Many clinicians suggest spacing a weekly dose a few days away from a vaccine; ask your clinician to plan the timing
• Tell the vaccinator you take sirolimus, and talk to your clinician before any vaccine, as MedlinePlus advises

When you get sick

For most people on longevity dosing, the sensible approach is to skip a dose during a significant infection, such as a fever, flu, a chest infection or anything needing antibiotics, and restart once you have recovered. Your clinician will give you specific guidance at the start, so you are not deciding in the middle of an illness.

Seek care promptly for a high or persistent fever, shortness of breath, a spreading skin infection or a wound that is red, oozing or slow to heal. MedlinePlus lists slow-healing or oozing wounds among the symptoms to report.

Surgery, dental work and wounds

The Rapamune label reports impaired or delayed wound healing in transplant patients. Whether low intermittent doses do the same is not well studied, so a cautious approach is common: stop rapamycin for a period before and after planned surgery or significant dental procedures, as agreed with your clinician and surgeon, and restart once the wound has healed. Always tell your surgeon or dentist that you take it.

Antibiotics, antifungals and other interactions

Sirolimus is broken down by the CYP3A4 enzyme and moved by a transporter called P-glycoprotein. Medicines that block these pathways can raise sirolimus levels sharply. The label says to avoid strong inhibitors such as clarithromycin, erythromycin, telithromycin, ketoconazole, itraconazole and voriconazole, and strong inducers such as rifampin, which lower levels. Grapefruit juice must be avoided, and MedlinePlus also flags St. John's wort and cannabidiol.

If another clinician prescribes an antibiotic or antifungal, mention rapamycin. Often the simplest step is to pause rapamycin during the course.

Before you travel

Travel brings together several of the issues on this page: vaccines that may be live, such as yellow fever or oral typhoid, antibiotics or antimalarials you might be prescribed, and a higher chance of picking up an infection away from home. Plan ahead with your clinician. You may need to schedule a live vaccine well before starting rapamycin, choose inactivated alternatives where they exist, or pause rapamycin for the trip. Carry a list of your medicines in case you need care abroad.

Other immune-related cautions

• Protect your skin from the sun; the label and MedlinePlus note higher skin cancer risk with immunosuppression
• Do not combine rapamycin with other immune-suppressing medicines without specialist advice
• People with active infections, a weakened immune system or recent cancer are generally not candidates for longevity use
• Report any recurrent infections to your clinician

Rapamycin through HealifyMD

HealifyMD prescribes FDA-approved sirolimus, filled by a licensed U.S. pharmacy. Its use for healthy aging is off-label. A licensed clinician reviews your history, medicines and labs (priced separately) and gives you clear rules for illness, vaccines and procedures. The price is from $99/month, confirmed at your eligibility review.