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Mitotane

Mitotane is an adrenolytic agent that suppresses (directly) the adrenal cortex and alters the peripheral metabolism of steroids
  • Article last reviewed 02 February 2026
  • 10 mins read

What is this medication for?

Mitotane is commonly used to reduce adrenal hormone production for the treatment of adrenal gland cancer.

How should I take or use this medication?

You may take this medication with a high fat content meal at the same time every day according to the schedule advised by your doctor. 

Do not stop taking your medication without checking with your healthcare professional.

What should I do if I forget to take or use this medication?

If you forget to take a dose, take it as soon as you remember (if the time you remember is close to your usual time of taking mitotane). Then take your next dose at the usual time. If the time you remember is closer to the time of your next dose, proceed to take your next dose and skip the missed dose. Do not take two doses to make up for the missed dose. 

What precautions should I take when taking or using this medication?

Inform your healthcare professional if: 

  • You are allergic to this medication or any of the other ingredients of this medication
  • You or your partner is pregnant, planning to become pregnant or breastfeeding
  • You are taking any other medications, including supplements, traditional medications and herbal remedies 

What are some common side effects of this medication? ​

Nausea or vomiting
  • Take small and frequent meals.
  • Avoid foods or smells that may make you feel nauseous, such as oily, fried, or strong-smelling food.
  • Avoid tight-fitting clothes around the waist.
  • Your doctor may prescribe medications to help relieve or prevent nausea or vomiting. Take these as instructed.
Diarrhoea (loose and frequent stools)
  • Drink plenty of clear fluids (at least 2 litres or 8 glasses every day).
  • Eat food that is gentler on the stomach such as porridge or soup.
  • Avoid milk, dairy products, high-fibre food and oily or spicy food.
  • Your doctor may prescribe medications to help relieve diarrhoea. Take these as instructed.
  • Proceed to the A&E Department immediately if you have very bad diarrhoea (for example increase in bowel movement of more than 4 times per day) that does not improve even after taking medications for diarrhoea.
Skin rash
  • Avoid hot showers. Use cool or lukewarm water to bathe.
  • Apply a moisturiser to areas with dry skin.
  • Please see a doctor immediately if the rashes are painful, blistering, or affect a large area of the body.

 

Vertigo/Drowsiness

A sensation of a loss of balance that can be caused by looking down from a great height, or from a disease affecting the inner ear

 

  • Do not drive or operate machinery if you are feeling drowsy
  • Avoid alcohol as this may cause you to feel more drowsy
  • You should seek medical advice if vertigo symptoms persist for a couple of hours or keep reoccurring for more than a couple of days.

 

Poor appetite
  • This may be worsened by a change in taste of food and/or nausea.
  • Try different flavours of food and have small frequent meals.
  • For poor appetite, try to include nutritional supplements (such as milk supplements) into your diet.

What are some rare but serious side-effects that I need to seek medical advice immediately? 

Hypersensitivity (allergic) reaction 
  • Seek medical advice if you experience any of the following during the infusion:
    • Flu-like symptoms such as fever, chills or dizziness, feeling warm or flushed
    • Red, warm, and itchy bumps on the skin
    • Swelling of the lips, tongue or throat
    • Breathlessness, wheezing, cough or sudden difficulty breathing
    • Back pain or chest pain
  • You may also be given medications to help with the symptoms. 

Hormone abnormalities 

  • Inflammation of various hormone glands (such as the pituitary, thyroid, pancreas, and adrenal glands) may occur.     
  • This may affect the production of certain hormones in your body.

Thyroid function may be less effective

  • Symptoms of an underactive thyroid gland include tiredness, weight gain, constipation, aches, feeling cold, dry skin and dry hair.
  • Some hormone levels can be monitored with regular blood tests. Some of the signs and symptoms include the following:
     
    • Headaches that do not go away
    • Vision problems
    • Unusually fast heartbeat
    • Increased sweating
    • Extreme tiredness
    • Unusual weight gain or weight loss
    • Feeling cold all the time
    • Increased hunger or thirst
    • Increased urination
    • Dizziness or fainting
    • Changes in mood or behaviour
  • Inform your doctor if you have any new symptoms as you may need a blood test to check your thyroid levels.
  • This medication may affect your body’s normal response to stress (such as when you have a fever, infection, severe injury or surgery) as it causes a lowering of the natural steroid that your adrenal gland makes. Inform your doctor immediately if there is any injury (shock or severe trauma) or infection (fever, chills, severe sore throat, pain when passing urine, wound that does not heal).If you experience any of these symptoms, you should stop your medication and see your healthcare professional immediately.

Liver problems

  • Rarely, this medication can injure or damage the liver. A liver injury may recover on its own. However, in some cases, it can cause serious liver damage.
  • Stop this medication and proceed to the A&E department immediately if you experience any:
    • Dark coloured urine
    • Llight-coloured stools
    • Yellowing of your skin or eyes
    • Nausea, vomiting that does not go away
    • Severe abdominal pain

What food or medication should I avoid when I take or use this medication?

Avoid taking other medications such as spironolactone, griseofulvin, rifampicin, rifabutin, blood thinner (eg. warfarin) and epilepsy medication when on mitotane as they may interact with mitotane and increase your risk of experiencing side effects of mitotane. 

How should I store this medication?

Store in a cool and dry place, away from direct sunlight. Keep this medication away from children. 

Discard this medication 12 month(s) after opening. 

How do I throw away this medication safely? ​

Pack the medication into a bag and bring it back to the pharmacy where you received the medication from.

Disclaimer

Please take note that the above is not a complete list of all possible side-effects. If you have any concerns about your medication or if you have other side-effects that you think are caused by this medication, please consult your doctor or pharmacist. If you take more than the recommended dose, please seek medical advice immediately. The information provided on this page does not replace information from your healthcare professional. Please consult your healthcare professional for more information.

This article is jointly developed by members of the National Medication Information workgroup. The workgroup consists of cluster partners (NHG Health, National University Health System and SingHealth), community pharmacies (Guardian, Unity and Watsons) and Pharmaceutical Society of Singapore. The content does not reflect drug availability and supply information in pharmacies and healthcare institutions. You are advised to check with the respective institutions for such information.

Please visit www.moh.gov.sg/knowyourmeds and www.ndf.gov.sg for more information on medication.