Product Information

Registration Status: Active

XTANDI SOFT CAPSULE 40MG is approved to be sold in Singapore with effective from 2015-08-24. It is marketed by ASTELLAS PHARMA SINGAPORE PTE LTD, with the registration number of SIN14829P.

This product contains Enzalutamide 40mg in the form of CAPSULE, LIQUID FILLED. It is approved for ORAL use.

This product is manufactured by Catalent Pharma Solutions in UNITED STATES.

It is a Prescription Only Medicine that can only be obtained from a doctor or a dentist, or a pharmacist with a prescription from a Singapore-registered doctor or dentist.



Enzalutamide is an androgen receptor inhibitor for the treatment of castration-resistant prostate cancer. FDA approved on August 31, 2012.


Enzalutamide is indicated for the treatment of patients with metastatic castration-resistant prostate cancer who have previously received docetaxel.

Mechanism of Action

Enzalutamide is a competitive androgen receptor inhibitor that effects multiple stages of the signalling pathway. It is able to inhibit androgen binding to its receptor, androgen receptor nuclear translocation, and subsequent interaction with DNA. As a result, proliferation of prostate cancer cells decreases which ultimately leads to apoptosis and decreased tumour volume.


The pharmacokinetic profile of enzalutamide and N-desmethyl enzalutamide (its major active metabolite) is described by a linear two-compartment model with first-order absorption. Enzalutamide also accumulates. Food does not affect its absorption. Tmax, prostate cancer patients = 1 hour (range of 0.5-3 hours); Cmax, steady state, enzalutamide = 16.6 μg/mL; Cmax, steady state, N-desmethyl enzalutamide = 12.7 μg/mL; Time to steady state, daily dosing = 28 days;
Apparent volume of distribution (Vd/F), single oral dose = 110 L
Enzalutamide is hepatically metabolized, primarily by CYP2C8 and CYP3A4. The enzyme that converts enzalutamide to its active metabolite, N-desmethyl enzalutamide, is CYP2C8. The activity of N-desmethyl-enzalutamide is similar to that of the parent compound.


Apparent clearance (CL/F), single oral dose = 0.56 L/h (range of 0.33 - 1.02 L/h)


The most common adverse reactions (≥ 5%) are asthenia/fatigue, back pain, diarrhea, arthralgia, hot flush, peripheral edema, musculoskeletal pain, headache, upper respiratory infection, muscular weakness, dizziness, insomnia, lower respiratory infection, spinal cord compression and cauda equina syndrome, hematuria, paresthesia, anxiety, and hypertension.

Active Ingredient/Synonyms

Enzalutamide | Enzalutamide |

Source of information: Drugbank (External Link). Last updated on: 3rd July 18. *Trade Name used in the content below may not be the same as the HSA-registered product.


  1. Health Science Authority of Singapore - Reclassified POM
  2. Drugbank