What is Capivasertib: Uses, Dosage, Side Effects and More

Capivasertib is a targeted cancer medication that blocks specific proteins called AKT enzymes, which help cancer cells grow and survive. This oral medication represents a newer approach to treating certain types of advanced breast cancer, particularly when other treatments haven't worked as well as hoped.

Your doctor might recommend capivasertib as part of a combination therapy, meaning you'll take it alongside other cancer medications. It's designed to work specifically against cancer cells that have certain genetic characteristics, making it what we call a "precision medicine" approach to treatment.

What is Capivasertib Used For?

Capivasertib is primarily used to treat advanced or metastatic breast cancer that has specific genetic features. It's particularly helpful for cancers that are hormone receptor-positive and HER2-negative, which are terms that describe the specific proteins found on your cancer cells.

Your oncologist will typically recommend this medication when your cancer has spread to other parts of your body or when previous hormone therapy treatments haven't been effective. The drug works best in cancers that have mutations in genes called PIK3CA, AKT1, or PTEN, which your doctor can identify through genetic testing of your tumor.

This medication is usually given in combination with fulvestrant, another hormone therapy drug. Together, these medications can help slow down or stop the growth of cancer cells that have become resistant to other treatments.

How Does Capivasertib Work?

Capivasertib works by blocking AKT proteins, which are like switches that tell cancer cells to grow, multiply, and survive. When these proteins are overactive, cancer cells can grow more aggressively and resist other treatments.

Think of AKT proteins as the gas pedal for cancer cell growth. Capivasertib acts like applying the brakes, slowing down the signals that encourage cancer cells to multiply. This makes it easier for your body's natural defenses and other cancer treatments to work more effectively.

This medication is considered a moderately strong targeted therapy. Unlike chemotherapy, which affects many different types of cells, capivasertib specifically targets the pathways that cancer cells use to grow and survive, potentially causing fewer side effects than traditional treatments.

How Should I Take Capivasertib?

You'll take capivasertib as capsules by mouth, typically twice daily with or without food. Your doctor will give you a specific schedule that usually involves taking the medication for four days, then taking three days off, repeating this cycle continuously.

It's important to take your doses at roughly the same times each day, about 12 hours apart. You can take capivasertib with water, milk, or juice. There's no need to avoid certain foods, though eating a light snack might help if you experience any stomach upset.

Swallow the capsules whole without crushing, chewing, or opening them. If you have trouble swallowing capsules, talk to your healthcare team about strategies that might help, but never alter the capsules themselves.

Your doctor will likely start you on a specific dose and may adjust it based on how well you tolerate the medication. They'll monitor your blood work regularly to ensure your body is handling the treatment well.

How Long Should I Take Capivasertib For?

You'll typically continue taking capivasertib for as long as it's helping control your cancer and you're tolerating it well. This could be several months or even years, depending on how your cancer responds to treatment.

Your oncologist will regularly assess how well the medication is working through imaging scans, blood tests, and physical examinations. They'll look for signs that your cancer is stable, shrinking, or unfortunately, growing despite treatment.

The decision to continue or stop capivasertib depends on the balance between its benefits and any side effects you might experience. Some people take it for many months with good results, while others might need to switch to different treatments sooner.

What Are the Side Effects of Capivasertib?

Most people experience some side effects with capivasertib, but they're often manageable with proper support and monitoring. The most common side effects tend to be mild to moderate and improve as your body adjusts to the medication.

Here are the side effects you're most likely to experience, and remember that your healthcare team has strategies to help manage each of these:

• Diarrhea, which can usually be controlled with over-the-counter medications
• Nausea and occasional vomiting
• Fatigue or feeling more tired than usual
• Skin rash or dryness
• Decreased appetite
• Mouth sores or tenderness
• High blood sugar levels

These common side effects are generally temporary and can be managed with medications, dietary changes, or dosage adjustments. Your team will work closely with you to minimize any discomfort.

There are also some less common but more serious side effects that require immediate medical attention. While these occur in a smaller percentage of people, it's important to be aware of them:

• Severe dehydration from persistent diarrhea
• Signs of infection like fever, chills, or persistent cough
• Severe skin reactions or widespread rash
• Difficulty breathing or chest pain
• Severe abdominal pain
• Symptoms of very high blood sugar like excessive thirst, frequent urination, or confusion

Your medical team will monitor you carefully for these effects and provide you with clear guidelines about when to contact them immediately.

Who Should Not Take Capivasertib?

Capivasertib isn't suitable for everyone, and your doctor will carefully review your medical history before prescribing it. People with certain health conditions or taking specific medications may need alternative treatments.

You shouldn't take capivasertib if you're pregnant, planning to become pregnant, or breastfeeding. The medication can harm a developing baby, so effective contraception is essential during treatment and for several weeks after stopping.

Your doctor will also be cautious about prescribing capivasertib if you have diabetes, severe kidney or liver problems, or a history of heart rhythm abnormalities. These conditions don't necessarily prevent you from taking the medication, but they require extra monitoring and possibly dose adjustments.

People taking certain medications, particularly those that affect blood sugar or interact with the liver's processing of drugs, may need alternative treatments or careful monitoring. Always tell your healthcare team about all medications, supplements, and herbal products you're taking.

Capivasertib Brand Names

Capivasertib is marketed under the brand name Truqap in the United States and other countries. You might also see it referred to by its research name, AZD5363, in medical literature or clinical trial information.

The medication is manufactured by AstraZeneca and is relatively new to the market, having received approval from the FDA in 2023. This means it represents one of the latest advances in targeted cancer therapy.

When you pick up your prescription, make sure the pharmacy provides you with the patient information leaflet that comes with Truqap. This contains important safety information and instructions specific to your medication.

Capivasertib Alternatives

If capivasertib isn't suitable for you or stops working effectively, several other targeted therapies might be options for treating your type of breast cancer. The choice depends on your cancer's specific characteristics and your overall health.

CDK4/6 inhibitors like palbociclib, ribociclib, or abemaciclib are often used for hormone receptor-positive breast cancers. These medications work differently than capivasertib but can be effective in similar situations.

mTOR inhibitors such as everolimus represent another class of targeted therapy that blocks different growth signals in cancer cells. Your oncologist might consider this if your cancer has specific genetic features that make it a good option.

PI3K inhibitors like alpelisib work on a pathway closely related to the one capivasertib targets. These might be alternatives if your cancer has PIK3CA mutations but capivasertib isn't suitable for you.

Your healthcare team will consider factors like your cancer's genetic profile, previous treatments, overall health, and personal preferences when discussing alternatives with you.

Is Capivasertib Better Than Other AKT Inhibitors?

Capivasertib is currently the most advanced AKT inhibitor available for treating breast cancer, with the most extensive clinical trial data supporting its use. Other AKT inhibitors are still being studied in clinical trials, but capivasertib has proven effective enough to receive FDA approval.

Compared to other targeted therapies like CDK4/6 inhibitors, capivasertib works through a different mechanism and may be effective in cancers that have become resistant to other treatments. However, "better" depends on your specific situation and cancer characteristics.

The advantage of capivasertib is its precision targeting of the AKT pathway, which can be particularly effective in cancers with specific genetic mutations. It also tends to have a different side effect profile compared to chemotherapy or other targeted therapies.

Your oncologist will help you understand how capivasertib compares to other options based on your individual cancer profile, treatment history, and health status. The "best" treatment is the one that works most effectively for your specific situation.