Medically Reviewed and Compiled by Dr. Adam N. Khan, MD.

What Is Abiraterone?

The prostate cancer drug abiraterone is a prescription medicine used to treat advanced prostate cancer. It helps slow down cancer growth by lowering certain male hormones in the body.

Abiraterone is sold under the brand name Zytiga. It is approved by the U.S. Food and Drug Administration (FDA) to treat specific stages of prostate cancer.

Doctors usually give abiraterone along with prednisone, a steroid medicine. This combination helps reduce side effects and improves treatment results.

How Prostate Cancer Grows

Prostate cancer depends on male hormones called androgens. The main androgen is testosterone.

Even when doctors lower testosterone with hormone shots (called androgen deprivation therapy or ADT), the body can still make small amounts of hormones in:

The adrenal glands
The tumor itself

These leftover hormones can continue to feed the cancer.

That is where abiraterone works.

How Abiraterone Works

Abiraterone blocks an enzyme called CYP17. This enzyme helps the body make androgens.

By blocking CYP17, abiraterone:

Lowers testosterone levels further
Reduces hormone production in the adrenal glands
Decreases hormone production inside cancer cells

According to the National Cancer Institute, abiraterone significantly lowers androgen levels in men with advanced prostate cancer.

This deeper hormone suppression can slow tumor growth and improve survival.

Who Should Take Abiraterone?

Abiraterone is used for men with:

1. Metastatic Castration-Resistant Prostate Cancer (mCRPC)

This means:

Cancer has spread
Testosterone is already low
Cancer still grows

2. Metastatic Castration-Sensitive Prostate Cancer (mCSPC)

In this stage:

Cancer has spread
It still responds to hormone therapy

The American Cancer Society confirms abiraterone is used in both settings depending on disease stage.

Major Clinical Trials Supporting Abiraterone

COU-AA-301 Trial

This study tested abiraterone in men whose cancer worsened after chemotherapy.

Published in the New England Journal of Medicine, the trial showed:

Improved overall survival
Better symptom control
Delayed cancer progression

LATITUDE Trial

This trial studied men with newly diagnosed metastatic prostate cancer.

Results showed:

Longer survival
Delayed need for chemotherapy
Reduced disease progression

These findings led to expanded FDA approval.

How Abiraterone Is Taken

Taken as a tablet by mouth
Usually once daily
Must be taken on an empty stomach
Always taken with prednisone

Food increases absorption too much. That can increase side effects.

Doctors also continue testosterone-lowering therapy during treatment.

Benefits of Abiraterone

According to the Mayo Clinic, benefits may include:

Longer survival
Slower disease progression
Reduced bone pain
Delayed chemotherapy
Improved quality of life

Many patients experience symptom relief, especially from bone metastases.

Common Side Effects

Because abiraterone changes hormone balance, it can cause side effects.

Mild to Moderate Effects

Fatigue
Joint pain
Swelling in legs
Hot flashes
High blood pressure

More Serious Risks

Low potassium
Liver problems
Fluid retention
Heart rhythm changes

Prednisone helps reduce some hormone-related complications.

Regular blood tests are required.

Monitoring During Treatment

Doctors monitor:

Liver function tests
Potassium levels
Blood pressure
PSA levels

Monitoring ensures safe use and early detection of complications.

Drug Interactions

Abiraterone may interact with:

Blood pressure medicines
Certain heart medications
Some seizure drugs

Always tell your doctor about all medications and supplements.

Unique Clinical Takeaways

1. Cardiovascular Risk Assessment Before Starting Treatment

Abiraterone can raise blood pressure and cause fluid retention. Men with:

Heart disease
Prior heart attack
Irregular heartbeat
Severe high blood pressure

Need careful screening.

A baseline heart evaluation may include:

Blood pressure review
Electrocardiogram (ECG)
Electrolyte testing

Men with uncontrolled cardiac disease may need stabilization before starting therapy.

This step is often underemphasized but critical for safety.

2. Distinguishing Liver Toxicity From Disease Progression

Abiraterone can raise liver enzymes. However, advanced prostate cancer can also spread to the liver.

If liver tests rise, doctors must determine:

Drug-related toxicity
Cancer progression
Other liver disease

Management differs greatly:

Drug toxicity may require dose hold
Metastatic spread may require therapy change

Close laboratory monitoring helps guide decisions.

3. Adherence and Fasting Requirements Matter More Than Patients Realize

Abiraterone must be taken on an empty stomach.

If taken with food:

Drug levels increase unpredictably
Side effects increase
Safety risks rise

Some patients unknowingly take it with breakfast.

Clear education is essential:

Take at least 1 hour before eating
Or 2 hours after food

Proper timing directly affects outcomes.

4. Bone Health Management Should Begin Early

Advanced prostate cancer weakens bones.

Long-term hormone therapy increases fracture risk.

Doctors may recommend:

Bone density testing
Calcium and vitamin D
Bone-strengthening medicines

Bone complications can reduce mobility and survival.

Early prevention improves long-term outcomes.

When Abiraterone May Not Be Appropriate

Abiraterone may not be suitable for:

Severe liver disease
Uncontrolled heart failure
Severe low potassium

Treatment decisions depend on overall health, cancer stage, and patient preference.

Comparison With Other Hormone Drugs

Other androgen-targeting drugs include:

Enzalutamide
Apalutamide
Darolutamide

Abiraterone works differently by blocking hormone production rather than blocking hormone receptors.

Choice depends on:

Disease stage
Side effect profile
Cost
Insurance coverage
Patient health status

Cost and Access Considerations

Abiraterone can be expensive. Generic versions are available.

Insurance often covers it when medically necessary.

Patient assistance programs may reduce costs.

Quality of Life Considerations

Many men stay active while taking abiraterone.

However, fatigue is common.

Lifestyle adjustments may include:

Regular light exercise
Balanced diet
Blood pressure control
Monitoring weight

Managing side effects improves daily functioning.

Long-Term Outlook

Abiraterone does not cure advanced prostate cancer.

It slows progression and extends survival.

Many patients eventually require additional treatments.

Combination therapy is common in modern care plans.

Ongoing research continues to refine optimal sequencing strategies.

References and Citations

U.S. Food and Drug Administration – Abiraterone acetate prescribing information and approval data.
National Cancer Institute – Hormone therapy for prostate cancer overview.
American Cancer Society – Treatment options for advanced prostate cancer.
New England Journal of Medicine – COU-AA-301 and LATITUDE trial publications on abiraterone survival outcomes.
Mayo Clinic – Clinical overview of abiraterone uses, risks, and monitoring.

Medical Disclaimer

This article is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Patients should consult a licensed physician or oncology specialist before starting or changing any cancer therapy