Testosterone Undecanoate 40mg Capsule

Medication Information Leaflet

What is this medication for?

Testosterone replacement is used to treat testosterone deficiency in males. It contains testosterone, a male hormone produced naturally in the body.

How should I take/use this medication?

  • Do not stop taking your medication without checking with your healthcare professional.
  • This medication should be taken after food and swallowed whole without chewing. The medication is taken twice daily, with a larger dose preferably in the morning if you are taking an uneven number of capsules.

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

If you forget to take a dose, take it as soon as you remember. Then take your next dose at the usual time. Do not take two doses to make up for the missed dose.

What precautions should I take?

Inform your healthcare professional if:

  • You are allergic to this medication or any of the other ingredients of this medication.
  • You have prostate or breast cancer.
  • You have history of:
    • Liver or kidney problems
    • Heart conditions
    • Uncontrolled blood pressure
    • Clotting disorders
    • Epilepsy (fits)
    • Migraine
    • Benign prostate hyperplasia (enlargement of prostate)
    • Sleep apnea (a sleep disorder)
    • Diabetes
  • You are taking any other medications, including supplements, traditional medications and herbal remedies.

Pregnant women must avoid any contact with the medication, as it may cause the development of unwanted male characteristics in the developing baby. In the event of a contact, wash the area of contact as soon as possible with soap and water.

What are some common side-effects of this medication?

  • Oily stools, abdominal pain
  • Nausea, vomiting, diarrhoea
  • Acne, itching skin
  • Chills, muscle pain
  • Changes in sexual desire (libido)
  • Breast enlargement
  • Fluid retention in the tissues usually marked by swelling of legs, ankle, lower legs
  • Tingling sensation, headache

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

The symptoms of a drug allergy include one or more of the following:

  • Swollen face/eyes/lips/tongue
  • Difficulty in breathing
  • Itchy skin rashes over your whole body

If you experience any of these symptoms, you should stop your medication and see your healthcare professional immediately.

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

Inform your doctor if you are taking oral anticoagulant (warfarin), corticosteroids, insulin or other anti-diabetic medications.

How should I store this medication?

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

How should I throw away this medication safely?

Pack this medication into a black trash bag and seal it tightly before throwing into the rubbish chute or bin.

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 (National Healthcare Group, 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.

Last updated on Feb 2021
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