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

Bevacizumab is a targeted cancer medication given through an IV that helps slow tumor growth by blocking blood vessel formation. This medicine works differently from traditional chemotherapy by targeting the specific proteins that help tumors create their own blood supply.

You might feel overwhelmed hearing about this treatment, and that's completely natural. Understanding how bevacizumab works and what to expect can help you feel more prepared and confident about your care plan.

What is Bevacizumab?

Bevacizumab is a laboratory-made antibody that mimics your body's natural immune system proteins. It belongs to a group of medicines called monoclonal antibodies, which are designed to target very specific parts of cancer cells.

Think of it as a targeted approach rather than a broad treatment. While chemotherapy affects many types of cells throughout your body, bevacizumab focuses specifically on blocking a protein called VEGF (vascular endothelial growth factor). This protein helps tumors grow new blood vessels to feed themselves.

The medication comes as a clear liquid that healthcare providers give through a vein in your arm. Each treatment session typically takes 30 to 90 minutes in a medical facility where you can be monitored closely.

What is Bevacizumab Used For?

Bevacizumab treats several types of advanced cancers, often combined with other cancer medicines. Your oncologist prescribes it when tumors have spread or when other treatments haven't worked as well as hoped.

The most common cancers treated with bevacizumab include colorectal cancer, lung cancer, kidney cancer, and certain brain tumors called glioblastomas. It's also used for some types of ovarian and cervical cancers.

In some cases, doctors use bevacizumab to treat a serious eye condition called wet macular degeneration, though this involves a different form of the medication injected directly into the eye. The IV form we're discussing here is specifically for cancer treatment.

How Does Bevacizumab Work?

Bevacizumab works by starving tumors of their blood supply rather than directly killing cancer cells. It blocks VEGF, the protein that signals your body to grow new blood vessels toward tumors.

When tumors can't get enough blood flow, they struggle to grow and spread to other parts of your body. This approach can slow cancer progression and may shrink existing tumors in some people.

This medication is considered a moderately strong cancer treatment. While it's generally better tolerated than traditional chemotherapy, it can still cause significant side effects that require careful monitoring by your healthcare team.

How Should I Take Bevacizumab?

You'll receive bevacizumab through an IV infusion at a cancer treatment center or hospital. The medication is given slowly over 30 to 90 minutes, depending on how well you tolerate it during your first few treatments.

Your healthcare team will check your blood pressure before each treatment since bevacizumab can cause it to rise. They'll also monitor you closely during the infusion for any immediate reactions.

You don't need to take this medication with food since it goes directly into your bloodstream. However, eating a light meal before treatment can help you feel more comfortable during the infusion process.

Make sure to stay well-hydrated by drinking plenty of water before and after each treatment. Your care team may also give you other medications before the infusion to help prevent nausea or allergic reactions.

How Long Should I Take Bevacizumab For?

The length of bevacizumab treatment varies greatly depending on your specific type of cancer and how well you respond to the medication. Some people receive it for a few months, while others may continue for a year or longer.

Your oncologist will regularly assess how your cancer is responding through scans and blood tests. They'll continue treatment as long as it's helping control your cancer and you're tolerating the side effects reasonably well.

Treatment typically continues until your cancer progresses, side effects become too difficult to manage, or you and your doctor decide to try a different approach. The decision to stop is always made together with your healthcare team.

What Are the Side Effects of Bevacizumab?

Bevacizumab can cause side effects ranging from mild to serious, though not everyone experiences them. Understanding what to watch for helps you get prompt care when needed.

The most common side effects you might experience include fatigue, high blood pressure, and nosebleeds. Many people also notice changes in their sense of taste or develop mouth sores.

Here are the more frequently reported side effects that affect many people taking bevacizumab:

• Fatigue and weakness
• High blood pressure
• Nosebleeds or bleeding gums
• Diarrhea or constipation
• Loss of appetite
• Headaches
• Joint or muscle pain
• Skin rash or dry skin

These common side effects are generally manageable with supportive care and medication adjustments. Your healthcare team can provide strategies to help you cope with each of these issues.

While less common, some people experience more serious side effects that require immediate medical attention. These rare but significant complications can affect your heart, lungs, or other vital organs.

Contact your healthcare provider immediately if you experience any of these serious side effects:

• Severe chest pain or trouble breathing
• Signs of stroke like sudden weakness, confusion, or vision changes
• Severe abdominal pain
• Unusual bleeding or bruising
• Signs of infection like fever, chills, or persistent cough
• Severe headache with vision changes
• Wound healing problems

These serious side effects are uncommon, but recognizing them early allows for prompt treatment and better outcomes. Your healthcare team will monitor you closely to catch any problems before they become severe.

Who Should Not Take Bevacizumab?

Bevacizumab isn't suitable for everyone with cancer. Your oncologist will carefully review your medical history and current health status before recommending this treatment.

You shouldn't receive bevacizumab if you're allergic to it or any of its ingredients. People with certain heart conditions, recent surgeries, or active bleeding problems typically can't take this medication safely.

Several health conditions make bevacizumab too risky to use. Your doctor will discuss these factors with you during treatment planning:

• Recent major surgery or upcoming planned surgery
• Active bleeding or blood clotting disorders
• Severe heart disease or recent heart attack
• Uncontrolled high blood pressure
• Recent stroke or blood clots
• Pregnancy or breastfeeding
• Severe kidney or liver disease

Even if you have some of these conditions, your oncologist might still consider bevacizumab if the benefits outweigh the risks. Each situation is unique, and treatment decisions are always individualized.

Bevacizumab Brand Names

Bevacizumab is available under several brand names, with Avastin being the most widely recognized original version. This was the first bevacizumab product approved for cancer treatment.

Several biosimilar versions are now available, including Mvasi, Zirabev, and Alymsys. These biosimilars work essentially the same way as the original Avastin but may cost less.

Your insurance coverage and treatment center preferences often determine which brand you receive. All approved versions have been thoroughly tested to ensure they work equally well for cancer treatment.

Bevacizumab Alternatives

Several other medications work similarly to bevacizumab by targeting blood vessel formation in tumors. These alternatives might be options if bevacizumab isn't suitable for you or stops working effectively.

Ramucirumab is another anti-VEGF medication that works through a slightly different mechanism. It's approved for certain types of stomach, lung, and colorectal cancers.

Other targeted therapies like aflibercept and regorafenib also interfere with tumor blood supply. Your oncologist might recommend these if your cancer develops resistance to bevacizumab.

For some cancers, immunotherapy medications like pembrolizumab or nivolumab might be alternatives. These work by helping your immune system fight cancer cells more effectively.

Is Bevacizumab Better Than Other Similar Medicines?

Bevacizumab was the first medication of its kind approved for cancer treatment, giving doctors the most experience with its use. Whether it's "better" depends on your specific cancer type, overall health, and individual response.

For some cancers like colorectal and lung cancer, bevacizumab has been extensively studied and shown to improve outcomes when combined with chemotherapy. The research supporting its use in these cancers is particularly strong.

Newer alternatives like ramucirumab might work better for certain types of cancer or cause fewer side effects in some people. Your oncologist considers factors like your cancer's specific characteristics and your medical history when choosing the best option.

The "best" medication is often the one that provides good cancer control while causing manageable side effects for your particular situation. This decision is always made collaboratively between you and your healthcare team.