Thalomid treats a type of bone marrow cancer called multiple myeloma. Women taking Thalomid should use two reliable forms of contraception to avoid becoming pregnant.

Thalomid Overview


Thalomid is a prescription medication used to treat multiple myeloma (cancer of plasma cells in the bone marrow) and skin lesions from leprosy. Thalomid belongs to a group of drugs called immunomodulatory agents, which strengthen the immune system and prevent swelling in skin lesions.

This medication comes in capsule form and is taken once a day, at bedtime.

Common side effects of Thalomid include swelling of hands and feet, constipation, and numbness. Thalomid can cause birth defects in babies. Men and women should not have unprotected sex while taking this medication.

Patient Ratings for Thalomid

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What are you taking Thalomid for?

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  • Other
  • Arthritis, Rheumatoid
  • Behcet Syndrome
  • Carcinoma, Renal Cell
  • Crohn Disease
  • Erythema Multiforme
  • Erythema Nodosum
  • Graft Vs Host Disease
  • Histiocytosis, Langerhans-cell
  • Leprosy
  • Lupus Erythematosus, Discoid
  • Multiple Myeloma
  • Stomatitis, Aphthous
  • Waldenstrom Macroglobulinemia

How long have you been taking it?

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  • Less than a week
  • A couple weeks
  • A month or so
  • A few months
  • A year or so
  • Two years or more

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Thalomid Cautionary Labels


Uses of Thalomid

Thalomid is a prescription medicine taken with the medicine dexamethasone, to treat people who have been newly diagnosed with multiple myeloma. Thalomid is also used to treat people when new lesions of leprosy flare up. Thalomid is used as a treatment to keep the lesions in check or to prevent the skin lesions of leprosy from coming back.

This medication may be prescribed for other uses. Ask your doctor or pharmacist for more information.


Thalomid Drug Class

Thalomid is part of the drug class:

Side Effects of Thalomid

Thalomid may cause serious effects, including:

  • See "Thalomid Precautions" and FDA Warning.
  • Drowsiness and sleepiness. 
  • Nerve damage. Nerve damage is common with Thalomid .  If the nerve damage is severe, it may not go away.  Stop taking Thalomid and call your healthcare provider right away if you have any of these early symptoms of nerve damage in your hands, legs, or feet:
    • numbness
    • tingling
    • pain
    • burning sensation
  • Dizziness and decreased blood pressure when changing positions. Thalomid may cause a decrease in your blood pressure, and you may feel dizzy when you go from a lying down or sitting position to standing up.  When changing positions, sit upright for a few minutes before standing to help prevent this.
  • Decreased white blood cell count. Thalomid can cause decreased white blood cell counts, including neutrophils.  Neutrophils are a type of white blood cell that is important in fighting bacterial infections.  Your healthcare provider should check your white blood count before and regularly while you take Thalomid .  If your neutrophils are too low you should not start Thalomid and if they are low during treatment, your dose of Thalomid may need to be changed.
  • Increased HIV virus in the blood.  If you are HIV positive, your healthcare provider should check your viral load after one month and three months of treatment, then every 3 months after that.
  • Slow heartbeat (bradycardia). Tell your healthcare provider if you have a slow heartbeat, fainting, dizziness or shortness of breath.
  • Serious skin reactions. Serious skin reactions can happen with Thalomid and may cause death.  Call your healthcare provider right away if you have any skin reaction while taking Thalomid.
  • Seizures. Tell your healthcare provider right away if you have a seizure while taking Thalomid.
  • Tumor Lysis Syndrome (TLS). TLS is caused by a fast breakdown of cancer cells. TLS can cause a build up of potassium, phosphorus, uric acid, and low calcium levels in your blood. This can cause you to have serious kidney  problems, an abnormal heart beat and can cause death. Your healthcare provider will check your blood for these problems.
  • Birth control. Certain birth control methods may pose a higher risk of serious side effects and should not be used in some women. These risks include severe decreased white blood cell count, low platelet counts, and blood clots. Use of an intrauterine device (IUD) or implantable birth control may also increase your risk of infection or bleeding during insertion, removal or during use of the device.
  • Allergic reaction. Allergic reactions can happen with Thalomid and may be severe. Call your healthcare provider or get medical help right away if you have any of these symptoms of allergic reaction:
    • a red, itchy rash
    • fever
    • fast heartbeat
    • feel dizzy or faint

The most common side effects of Thalomid for treatment of multiple myeloma include:

  • tiredness
  • decreased calcium levels
  • swelling of the hands and feet
  • constipation
  • numbness or tingling
  • muscle weakness
  • skin rash or peeling
  • confusion
  • decreased appetite
  • nausea
  • anxiety
  • decreased energy or strength
  • tremor
  • fever
  • weight loss
  • muscle twitching and cramping
  • weight gain
  • dizziness
  • dry skin

The most common side effects Thalomid for treatment of leprosy include:

  • sleepiness
  • rash
  • headache
  • dizziness
  • impotence
  • decreased energy or strength
  • not feeling well
  • pain

Tell your healthcare provider if you have any side effect that bothers you or that does not go away.

These are not all the possible side effects of Thalomid. For more information, ask your doctor or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Thalomid Interactions

Tell your healthcare provider about all the medicines you take including prescription and nonprescription medicines, vitamins, and herbal supplements. Thalomid and other medicines may affect each other causing serious side effects.

Certain medicines can affect the way that birth control pills, injections, patches, or implants work. You could become pregnant.

Especially tell your healthcare provider if you also take:

  • a pain medicine
  • antihistamines
  • a medicine for psychosis
  • a medicine for anxiety
  • a medicine for your heart
  • a medicine for depression
  • famotidine (Pepcid, Duexis)
  • cimetidine (Tagamet)
  • lithium (lithobid)
  • bortezomib (Velcade)
  • amiodarone (Cordarone, Pacerone)
  • cisplatin
  • paclitaxel (Abraxane)
  • vincristine
  • disulfiram (Antabuse)
  • metronidazole (Flagyl, Metrocream, Metrolotion, Metrogel, Helidac, Noritate, Plera)
  • a penicillin antibiotic
  • an anti-HIV medicine
  • phenytoin (Fosphenytoin, Cerebyx, Dilantin-125, Extended Phenytoin Sodium, Prompt Phenytoin Sodium, Phenytek, Dilantin, Phenytoin Sodium)
  • carbamazepine (Carbatrol, Equetro, Tegretol, Tegretol-XR, Teril, Epitol)
  • rifampin (Rifater, Rifamate, Rimactane, Rifadin)
  • the herbal supplement St. John’s Wort (Hypericum perforatum)
  • modafinil (Nuvigil, Provigil)
  • griseofulvin (Grifulvin V, Gris-Peg)

Ask your healthcare provider if you are not sure if your medicine is one of these.

Know the medicines you take. Keep a list of them to show your healthcare provider and pharmacist.

Thalomid Precautions

  • Do not take Thalomid if you are pregnant, plan to become pregnant, or become pregnant during Thalomid treatment. 
  • Do not take Thalomid if you are a female who may become pregnant and are not using 2 forms of birth control or are not continually abstaining from sexual contact with a male. 
  • Do not take Thalomid if you are allergic to anything in it. 

Before you begin taking Thalomid, you must read and agree to all of the instructions in the S.T.E.P.S. program. Thalomid can cause severe and life-threatening human birth defects (deformed babies) or death of an unborn baby.  

Females who are pregnant or who plan to become pregnant must not take Thalomid. Females must not become pregnant:

  • for at least 4 weeks before starting Thalomid 
  • during any breaks (interruptions) in your treatment with Thalomid 
  • while taking Thalomid 
  • for at least 4 weeks after stopping Thalomid 

Talk to your healthcare provider right away if you have unprotected sex or if you think your birth control has failed.  If your healthcare provider is not available, you can call 1-888-668-2528 for emergency contraception information. 

If you become pregnant while taking Thalomid, stop taking it right away and call your healthcare provider. 

Healthcare providers and patients should report all pregnancies to:

  • FDA MedWatch at 1-800-FDA-1088, and
  • Celgene Corporation at 1-888-423-5436

Males should know that Thalomid passes into semen or sperm. Males, including those who have had a vasectomy, must use a latex or synthetic condom during any sexual contact with a pregnant female or a female that can become pregnant, while taking Thalomid, and for 4 weeks after stopping Thalomid.

  • Do not have unprotected sexual contact with a female who is or could become pregnant. Tell your healthcare provider if you do have unprotected sexual contact with a female who is or could become pregnant.
  • Do not donate sperm while taking Thalomid, and for 4 weeks after stopping Thalomid. If a female becomes pregnant with your sperm, the baby may be exposed to Thalomid and may be born with birth defects.
  • Men, if your female partner becomes pregnant, you should call your healthcare provider right away.

Venous thromboembolism (blood clots).  If you are taking Thalomid in combination with dexamethasone to treat multiple myeloma you have an increased risk for blood clots in your veins and lungs. Call your healthcare provider or get medical help right away if you get any of these signs or symptoms:

  • shortness of breath
  • chest pain
  • arm or leg swelling

Inform MD

Before you take Thalomid, tell your healthcare provider if you:

  • have a history of seizures
  • drink alcohol
  • plan to have surgery
  • are pregnant or breastfeeding. Thalomid must not be used by women who are pregnant or breastfeeding. See "Drug Precautions".

Tell your healthcare provider about all the medicines you take including prescription and nonprescription medicines, vitamins, and herbal supplements. 

Thalomid and Pregnancy

Tell your doctor if you are pregnant or plan to become pregnant.

The FDA categorizes medications based on safety for use during pregnancy. Five categories - A, B, C, D, and X, are used to classify the possible risks to an unborn baby when a medication is taken during pregnancy.

This medication falls into category X. Thalomid must not be used by women who are pregnant. See "Thalomid Precautions" and "Thalomid FDA Warning" sections.

Thalomid and Lactation

Tell your healthcare provider if you are breastfeeding or plan to breastfeed. Thalomid must not be used by women who are breastfeeding. See "Thalomid Precautions."

Thalomid Usage

Take Thalomid exactly as prescribed and follow all the instructions of the S.T.E.P.S. program.

Before prescribing Thalomid, your healthcare provider will:
  • explain the S.T.E.P.S. program to you
  • have you sign the Patient-Physician Agreement Form

Keep Thalomid in the blister pack until you take your daily dose.

  • Swallow Thalomid capsules whole with water.
  • Thalomid is taken one time each day, at least 1 hour after your evening meal. Bedtime is the preferred time to take Thalomid.
  • Do not open the Thalomid capsules or handle them any more than needed.  If you touch a broken Thalomid capsule or the medicine in the capsule, wash the area of your body with soap and water.
  • If you miss a dose of Thalomid and it has been less than 12 hours since your regular time, take it as soon as you remember. If it has been more than 12 hours, just skip your missed dose. Do not take 2 doses at the same time.
  • If you take too much Thalomid or overdose, call your healthcare provider or poison control center right away.

Females who can become pregnant:

  • will have pregnancy tests weekly for 4 weeks, then every 4 weeks if your menstrual cycle is regular, or every 2 weeks if your menstrual cycle is irregular. If you miss your period or have unusual bleeding, you will need to have a pregnancy test and receive counseling.
  • must agree to use 2 different forms of effective birth control at the same time, for at least 4 weeks before, while taking, and for at least 4 weeks after stopping Thalomid.

Males who take Thalomid, even those who have had a vasectomy, must agree to use a latex or synthetic condom during sexual contact with a pregnant female or a female who can become pregnant.

  • Females: Do not get pregnant and do not breastfeed while taking Thalomid.
  • Males: Do not donate sperm. 
  • Do not share Thalomid with other people. It may cause birth defects and other serious problems.
  • Do not donate blood while you take Thalomid, and for 4 weeks after stopping Thalomid. If someone who is pregnant gets your donated blood, her baby may be exposed to Thalomid and may be born with birth defects.
  • Thalomid can cause dizziness and drowsiness.  Avoid drinking alcohol, operating machinery, and driving a car when taking Thalomid. Avoid taking other medicines that may cause drowsiness without talking to your healthcare provider first.

Thalomid Dosage

Take this medication exactly as prescribed by your doctor. Follow the directions on your prescription label carefully. The dose your doctor recommends may be based on the following:

  • the condition being treated
  • other medical conditions you have
  • other medications you are taking
  • how you respond to this medication
  • your weight
  • your height
  • your age
  • your gender

Multiple myeloma

  • The recommended dose is 200 mg by mouth once daily.

Erythema Nodosum Leprosum (ENL)

  • The recommended dose is 100 to 300 mg/day for an episode of cutaneous ENL. Up to 400 mg/day for severe cutaneous ENL.


Thalomid Overdose

If you take too much Thalomid, call your healthcare provider or local Poison Control Center, or seek emergency medical attention right away.

If Thalomid is administered by a healthcare provider in a medical setting, it is unlikely that an overdose will occur. However, if overdose is suspected, seek emergency medical attention.

Other Requirements

  • Store Thalomid at 77°F (25°C).
  • Protect from light.
  • Keep Thalomid and all medicines out of the reach of children.

Thalomid FDA Warning



If Thalomid is taken during pregnancy, it can cause severe birth defects or death to an unborn baby. Thalomid should never be used by women who are pregnant or who could become pregnant while taking the drug. Even a single dose [1 capsule (regardless of strength)] taken by a pregnant woman during her pregnancy can cause severe birth defects.

Because of this toxicity and in an effort to make the chance of fetal exposure to Thalomid as negligible as possible, Thalomid is approved for marketing only under a special restricted distribution program approved by the Food and Drug Administration. This program is called the “System for Thalidomide Education and Prescribing Safety (S.T.E.P.S.®)”.

You can get the information about Thalomid and the S.T.E.P.S.® program on the Internet at or by calling the manufacturer’s toll-free number 1-888-423-5436.


The use of Thalomid in multiple myeloma results in an increased risk of venous thromboembolic events, such as deep venous thrombosis and pulmonary embolism.  This risk increases significantly when Thalomid is used in combination with standard chemotherapeutic agents including dexamethasone. In one controlled trial, the rate of venous thromboembolic events was 22.5% in patients receiving Thalomid in combination with dexamethasone compared to 4.9% in patients receiving dexamethasone alone (p = 0.002). Patients and physicians are advised to be observant for the signs and symptoms of thromboembolism. Instruct patients to seek medical care if they develop symptoms such as shortness of breath, chest pain, or arm or leg swelling. Consider thromboprophylaxis based on an assessment of individual patients’ underlying risk factors.