LENALIDOMIDE
About Lenalidomide
Lenalidomide — immunomodulatory agent (IMiD), thalidomide analogue
Lenalidomide is an oral medicine used in multiple myeloma and in certain myelodysplastic syndromes and lymphomas. It is an analogue of thalidomide, and it carries the same absolute requirement to avoid pregnancy.
How Lenalidomide works
It binds cereblon, part of a cellular protein-disposal complex, and redirects it to degrade specific transcription factors that myeloma cells depend on. Alongside that it modulates immune activity — enhancing T-cell and natural-killer-cell function — and inhibits the formation of new blood vessels. That combination of direct and immune effects is why it is classed as an immunomodulatory agent rather than as conventional chemotherapy.
What it is licensed for
Multiple myeloma, in combination regimens and as maintenance after stem cell transplant; transfusion-dependent anaemia in myelodysplastic syndromes with a deletion 5q abnormality; and relapsed or refractory mantle cell lymphoma and follicular lymphoma in defined settings.
How it is taken
An oral capsule taken once daily in cycles, most commonly 21 days of a 28-day cycle, with the pattern set by the regimen. Dosage must be determined by a qualified healthcare provider.
What your prescriber monitors
Full blood count, weekly at first, because neutropenia and thrombocytopenia are dose-limiting; thyroid function; liver function; and vigilance for signs of venous or arterial thrombosis.
Important cautions and interactions
It causes severe birth defects and must not be taken in pregnancy. Supply is controlled through a pregnancy prevention programme with mandatory counselling, contraception and pregnancy testing for anyone who could become pregnant, and contraception requirements for men because it is present in semen. Thrombosis risk is raised enough that antithrombotic prophylaxis is usually prescribed alongside. Blood counts fall predictably and dictate dose. It must never be shared, and unused capsules are returned to a pharmacy.
Where Lenalidomide sits in its class
Lenalidomide sits between thalidomide and pomalidomide in the immunomodulatory class: all three bind cereblon, and they differ in potency, side-effect emphasis and the settings they are licensed for. Thalidomide causes more neuropathy, lenalidomide more myelosuppression. All carry the same absolute prohibition in pregnancy and the same controlled-supply requirements.
What to expect in the first weeks
Blood counts are checked weekly at the start, and a dip is expected rather than alarming — dose adjustment or a short pause is the usual response. Fatigue, constipation, muscle cramp and a mild itchy rash are frequent. You will be shown the signs of clot in a calf or lung and asked to report them urgently. Pregnancy testing continues on the schedule set by the programme.
Before you start Lenalidomide
You will be enrolled in a pregnancy prevention programme before the first capsule, with counselling, contraception and pregnancy testing where applicable — this applies to men as well, since the medicine is present in semen. Tell your team about any previous blood clot, and about kidney problems, which affect dosing. Mention thyroid disease. Ask which antithrombotic you should be taking alongside, and never share capsules or keep leftovers.
Generic Lenalidomide and Revlimid
Generic Lenalidomide contains the same active ingredient as Revlimid®, produced by licensed pharmaceutical manufacturers. The brand name and the price differ, not the molecule.
Read our full guide: Generic Revlimid (Lenalidomide)
Lenalidomide is a prescription-only medicine. A valid prescription is required and every order is reviewed by a licensed pharmacist before dispatch. Used as prescribed by a licensed medical professional.
Frequently asked questions
Why is lenalidomide supplied under a controlled programme?
Because it is a thalidomide analogue and causes severe birth defects. Supply runs through a pregnancy prevention programme with required counselling, contraception and pregnancy testing. The controls apply to men as well, since the medicine is present in semen.
Why is a blood thinner often prescribed with lenalidomide?
It raises the risk of blood clots, particularly in combination regimens for myeloma, so antithrombotic prophylaxis — aspirin or an anticoagulant depending on your own risk — is commonly prescribed alongside. That choice is made by your haematology team.
Why are blood counts checked so often on lenalidomide?
Falls in neutrophils and platelets are the effects that most often limit the dose, and they are usually managed by adjusting the dose or pausing rather than by stopping. Weekly counts early in treatment are there to catch that in time.
Do I need a prescription to order Lenalidomide?
Yes. Lenalidomide is a prescription-only medicine. Upload a valid prescription at checkout — every order is reviewed by a licensed pharmacist before dispatch.
Last updated: October 3, 2026
Medically reviewed by
A. Srinivasan
A. Srinivasan is a licensed clinical pharmacist with 24 years of experience. He holds a B.Pharm and M.Pharm from University of Madras. At OnlineMeds, he reviews medicine and health content to help ensure it is accurate, evidence-based, and easy to understand.