Medical Oncologist
How to take abiraterone
Why Abiraterone Must Be Taken — on an Empty Stomach
The empty stomach rule is not a suggestion — food dramatically changes how much abiraterone your body absorbs, making the dose unpredictable from one day to the next. Getting this right every day is part of the treatment working as intended.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- Not a precaution — a dose rule — Food changes how much abiraterone reaches your bloodstream, which changes the effective dose.
- Even a light snack counts — Any food in the two hours before your tablets can affect absorption significantly.
- The window applies after too — You need to wait at least one hour after taking the tablets before eating.
- One missed dose, one missed window — If you have already eaten, wait and take the next scheduled dose — do not double up.
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Abiraterone must be taken on an empty stomach. Food increases how much of the drug your body absorbs, making the dose unpredictable and raising the risk of side effects. The prescribing label states: no food for at least two hours before taking the tablets, and at least one hour after.
Why does food change how abiraterone works?
Abiraterone is absorbed through the gut wall, and food in the stomach speeds and amplifies that absorption significantly. With a high-fat meal, the amount entering the bloodstream can be many times higher than when the stomach is empty — and even a light meal causes a substantial increase.
That variability is the problem. Your oncologist has prescribed a dose based on how the drug behaves when taken correctly. If food changes the amount absorbed on some days and not others, your blood level fluctuates in ways that are hard to predict or manage.
Higher blood levels than intended raise the risk of side effects. Lower ones on days when the rule slips may reduce how well the treatment works. Consistency is the goal, and an empty stomach is how consistency is achieved.
What happens if you take it with food by accident?
One dose taken on a full stomach is unlikely to cause lasting harm. Do not take an extra tablet to compensate — just take your next scheduled dose at the usual time, on an empty stomach.
If you realise you have eaten shortly before your usual tablet time, it is generally better to delay the dose until the two-hour window is clear than to take it immediately with food in your stomach.
If missed windows are becoming a pattern, tell your oncologist or pharmacist. They can help you find a time of day that fits your routine without compromising the rule.
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What counts as an empty stomach?
| Item | Allowed before the dose? | Notes |
|---|---|---|
| Plain water | Yes | Drink as much as you like — use water to swallow the tablets |
| Any food — meal, snack, biscuit, fruit | No | Wait at least two hours from your last bite before taking the tablets |
| Milk or a milky drink | No | Milk contains fat and counts as food for this purpose |
| Black coffee or black tea | Check with your pharmacist | Plain water is the safe default; ask about other liquids for your specific formulation |
| Nutritional supplement drinks (Ensure, Boost) | No | These are calorie-containing and break the fast |
| After taking the tablets | Water only | Wait at least one hour before eating or drinking anything other than water |
How to take abiraterone correctly every day
Choose a fixed time
Pick a time you can reliably be two hours away from any meal. First thing on waking or last thing at night both work well — you are already fasted, and the pattern is easy to remember.
Check the gap before you take them
Confirm it has been at least two hours since you last ate anything. If not, wait until it has — a short delay is better than taking them with food.
Swallow the tablets whole with a full glass of water
Do not crush, split or chew the tablets. Plain water is all you need.
Wait before eating
After swallowing the tablets, wait at least one hour before having food, milk or any calorie-containing drink.
Set an alarm for your meal
A phone reminder set for one hour after your tablets removes the guesswork and helps the habit stick across busy days.
If the timing slips today
Do not take a late dose with food and do not double up at the next dose. Resume at the next scheduled time, on an empty stomach.
Did you know?
Food can increase the amount of abiraterone absorbed into the bloodstream many times over compared with a fasted state. The FDA prescribing information for Zytiga documents this as one of the largest food effects seen with any oral cancer drug.
This is why the empty stomach rule is absolute, not advisory — the dose your oncologist prescribed assumes you follow it every day.
Source: FDA Prescribing Information, Zytiga (abiraterone acetate)
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Common questions
Frequently asked questions
What if I forgot and took abiraterone after eating?
Do not take a second tablet to compensate, and do not skip the next dose. Simply continue your usual schedule — take the next dose at the correct time, on an empty stomach. One day of altered absorption is unlikely to affect your treatment significantly. If this happens often, speak to your pharmacist or oncologist so they can help you find a routine that works.
Does black coffee or tea break the empty stomach rule?
Plain water is the only liquid confirmed safe to take alongside your tablets. The position on black coffee and unsweetened tea is less clearly defined, and the answer can depend on your exact formulation. Ask your pharmacist directly — they will give you guidance for the tablets you have been prescribed. Milk, sugary drinks, and nutritional supplements count as food and break the fast.
Can I change the time of day I take abiraterone?
Yes, as long as you keep a consistent gap of roughly 24 hours between doses and choose a time you can reliably observe the food window. First thing in the morning works well for many people — you wake up already fasted, take the tablets, then eat breakfast an hour later. If evenings suit you better, stop eating early enough to ensure the two-hour gap is clear before your dose.
Why is higher absorption a problem — wouldn't more of the drug be better?
No. Abiraterone is prescribed at a dose calculated to be effective while keeping side effects manageable. A much higher blood level than intended — caused by food — raises the risk of side effects including low blood pressure, fluid retention, and hormonal changes, without adding therapeutic benefit. Consistent, predictable absorption at the intended level is the goal, and an empty stomach is how that is reliably achieved.
Is there a form of abiraterone that can be taken with food?
Yes. A different formulation of abiraterone acetate, at a lower tablet strength, is designed to be taken with a light, low-fat meal rather than on an empty stomach. Whether it is available, appropriate for your situation, or covered by your insurance is a question for your oncologist. If maintaining the empty stomach routine is genuinely difficult, ask specifically whether an alternative formulation is an option — it is a reasonable question to raise.