Rapamycin
The most consistent longevity drug in animal research. Originally an immunosuppressant, low-dose pulsed rapamycin is now the most discussed anti-aging drug among longevity physicians.
Rapamycin inhibits mTOR — the master growth switch in your cells. When mTOR is dialled down, your cells shift from "grow" mode to "repair and recycle" mode. In the NIA's Interventions Testing Program, rapamycin extended lifespan in mice by up to 26%, even when started late in life.
Who's using it: Longevity physicians and biohackers worldwide. Not FDA-approved for aging — used off-label. Requires a knowledgeable doctor and regular monitoring.
Dive deeper into the researchCommon side effects
- Mouth sores (aphthous ulcers) — the most common at higher doses
- Lipid changes — LDL and triglycerides may rise
- Immunosuppression risk at high/continuous doses
What does rapamycin do?
Every cell in your body has a switch called mTOR (mechanistic target of rapamycin). When mTOR is active, your cells grow, divide, and build new proteins. When mTOR is inhibited, cells switch to maintenance mode — recycling damaged components (autophagy), repairing DNA, and resisting stress.
Rapamycin inhibits mTOR. At high continuous doses (as used in transplant patients), this suppresses immunity. At low pulsed doses (weekly), it appears to rejuvenate the immune system instead — improving vaccine responses in elderly patients and reducing infection rates in clinical trials.
Who is it for?
- Longevity-focused individuals — those willing to use an off-label drug with strong animal data but limited human aging trials
- People with signs of accelerated aging — elevated mTOR markers, poor immune function, or metabolic dysfunction
- Under physician supervision only — rapamycin requires monitoring of lipids, blood counts, and kidney function
How to take it
3–6 mg once weekly. Most longevity physicians start at 1–2 mg weekly and titrate up based on tolerance and blood markers. Taken on the same day each week, with or without food.
Pulsed dosing allows mTOR to recover between doses, avoiding the chronic immunosuppression seen in transplant patients who take it daily.
India context
- Availability: Generic sirolimus is manufactured by several Indian pharma companies. Cost: ₹10–25 per tablet (0.5 mg or 1 mg). Brand names include Rapacan, Siromus, and others.
- Prescription: Classified as a prescription drug. Typically prescribed by nephrologists or transplant physicians. Finding a longevity-oriented doctor willing to prescribe off-label may be challenging but is increasingly common in metro cities.
- Storage: Sirolimus should be stored at room temperature, protected from light. No cold-chain needed for tablets.
- Monitoring: Requires periodic blood work — CBC, lipid panel, fasting glucose, kidney function, and liver enzymes every 3–6 months.
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Get early accessFrequently Asked Questions
Is rapamycin safe for longevity use?
At low pulsed doses (3–6 mg weekly), rapamycin appears to have a different safety profile than the high daily doses used in transplant patients. Small clinical trials in elderly patients showed improved immune function and good tolerability. However, long-term human data for longevity use is still limited. You need a knowledgeable physician and regular monitoring.
Does rapamycin suppress your immune system?
At high continuous doses (daily, as in transplant medicine), yes — it suppresses immunity. At low weekly doses used for longevity, the effect is different. Studies in elderly patients showed improved vaccine responses and reduced infections. The pulsed dosing allows mTOR to cycle, which appears to rejuvenate rather than suppress immune function.
How much does rapamycin cost in India?
Generic sirolimus tablets (0.5 mg or 1 mg) cost ₹10–25 per tablet in India. At a typical longevity dose of 3–6 mg weekly, that works out to roughly ₹120–600 per month — making India one of the most affordable places in the world for rapamycin access.
What side effects should I watch for?
The most common side effect at longevity doses is mouth sores (aphthous ulcers). Lipid changes — particularly elevated LDL and triglycerides — are also common. Some people report delayed wound healing. All side effects should be monitored with regular blood work. If mouth sores are severe, reducing the dose or adding a week off usually helps.
How it works in your body
Rapamycin binds to a protein called FKBP12, and this complex then inhibits mTORC1 — one of two mTOR complexes. mTORC1 controls cell growth, protein synthesis, and autophagy. When you inhibit mTORC1, cells reduce protein production and ramp up autophagy — the cellular recycling process that clears damaged mitochondria, misfolded proteins, and other cellular debris.
At continuous high doses, rapamycin also begins inhibiting mTORC2, which is responsible for insulin signalling and is thought to be behind the metabolic side effects (glucose intolerance, lipid changes). Pulsed weekly dosing preferentially targets mTORC1 while allowing mTORC2 to remain mostly functional.
What the studies show
- ITP (mice): Up to 26% median lifespan extension in males and 23% in females. The strongest and most reproducible result in the NIA's testing program. Remarkably, benefits were seen even when started at 20 months (equivalent to ~60 human years).
- Immune rejuvenation (humans): Mannick et al. (2018) — low-dose mTOR inhibition in elderly patients improved influenza vaccine response by 20% and reduced infection rates by 40%.
- Cardiac aging (dogs): The Dog Aging Project showed improved cardiac function in middle-aged companion dogs given rapamycin.
- Lipid effects: LDL and triglycerides commonly increase 10–20%. Usually manageable with monitoring or statin co-therapy if needed.
Side effects & safety
Side effects at longevity doses are generally mild but need monitoring:
- Mouth sores (aphthous ulcers) — the most common complaint. Dose-dependent. Usually resolve with dose reduction or temporary pause.
- Lipid changes — LDL and triglycerides may increase 10–20%. Monitor lipid panel every 3–6 months. Some physicians co-prescribe a statin if needed.
- Blood sugar — fasting glucose can rise slightly, likely from partial mTORC2 inhibition. More relevant at higher or more frequent doses.
- Delayed wound healing — some users report slower healing of cuts or scrapes. If you have a planned surgery, stop rapamycin 1–2 weeks before.
- Infections — at transplant doses, infection risk increases significantly. At pulsed longevity doses, this appears to not be an issue — and may actually improve.
Who should avoid it: Anyone with active infections, immunodeficiency, uncontrolled diabetes, or who is planning surgery. Not recommended during pregnancy or breastfeeding. Discuss with your doctor if you're on statins, antifungals, or macrolide antibiotics (drug interactions via CYP3A4).
Which labs to check
- CBC with differential — monitor white blood cell counts
- Lipid panel (LDL, HDL, triglycerides) — the most commonly affected markers
- Fasting glucose and HbA1c — watch for glucose elevation
- Kidney function (creatinine, eGFR) — baseline and periodic
- Liver enzymes (ALT, AST) — monitor hepatic function
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