Sonrotoclax (Beqalzi™)

Author: Marisa Healy, BSN, RN
Content Contributor: Arefa Bacchus, PharmD, BCOP 
Last Reviewed: June 25, 2026

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Pronounce: son-ROE-toe-klax

Classification: BCL-2 Inhibitor

About Sonrotoclax (Beqalzi™)

Sonrotoclax works by binding to and inhibiting (blocking or slowing down) BCL-2, which is a protein found on some cancer cells.

How to Take This Medication

Sonrotoclax comes in a tablet to be taken by mouth. Take this medication around the same time every day, with a meal and water. Swallow the tablets whole. Do not chew, crush, or break the tablets. If you are having trouble swallowing the tablets, talk to your pharmacist.

The dose of this medication is increased slowly over a period of time. During this time, you will need to drink enough fluids during the day to prevent tumor lysis syndrome (TLS). TLS happens when tumor cells break down too quickly and release their contents into your body.

  • You should drink 6 to 8 glasses of non-alcoholic fluids (about 1.5 to 2 liters total), starting 1-2 days before the first dose, the day of the first dose, on any day the dose is increased until target dose is reached, and at restart, if applicable.
  • At each increase of dose, you may have blood tests drawn.
  • You may be given intravenous (IV, into a vein) fluids and medications to protect your kidneys.

If you miss a dose and it is within 8 hours of when you usually take your dose, take the missed dose and return to your normal schedule. If it has been longer than 8 hours since your normally scheduled dose, skip that dose and return to your normal schedule the next day. If you vomit after taking the dose, do not take an extra dose. Return to your normal schedule with the next dose.

It is important to take the correct amount of medication. Before each dose, check that the medication and the amount match what your provider prescribed.

The blood levels of this medication can be affected by certain foods and medications, so they should be avoided. These include: grapefruit products, starfruit, Seville oranges, ketoconazole, voriconazole, ciprofloxacin, amiodarone, diltiazem, carvedilol, and verapamil, among others.

Be sure to tell your healthcare provider about all medications and supplements you take.

Storage and Handling

Store your medication in the original container with the label. If you want to use a pillbox, talk to your pharmacist. Keep it in a dry place at room temperature unless your provider or pharmacist tells you otherwise. Keep containers out of reach of children and pets.

If a caregiver prepares your dose for you, they should consider wearing gloves or pour the pills directly from their container into the cap, a small cup, or directly into your hand. They should avoid touching the pills. They should always wash their hands before and after giving you the medication. Pregnant or nursing people should not prepare the dose for you. Ask your provider where to return any unused medication for disposal. Do not flush down the toilet or throw in the trash. 

Where Do I Get This Medication?

Some cancer medications are only available through specialty pharmacies. Your provider or pharmacist will start this process. Your insurance plan may also affect where you can get your medication.  Call your prescription plan provider to find out which specialty pharmacies are in-network.

Insurance Information

This medication may be covered by your prescription plan. If you qualify, you may be able to get financial help through patient assistance programs (PAP). Co-pay cards may also be available to lower your out-of-pocket cost if you have commercial (not Medicare/Medicaid/Tricare) insurance. Your pharmacist, social worker, or navigator can help find resources for financial support.

Possible Side Effects

These are some of the most common or most serious side effects of this medication. Talk with your provider about the side effects you are having and how they can be managed.

Tumor Lysis Syndrome

Tumor Lysis Syndrome (TLS) is a side effect that happens when tumor cells die too quickly, and their waste overwhelms the body. You may be given a medication (allopurinol) and IV fluids to help prevent this. TLS can affect your kidney function. Your provider will monitor your kidney function with blood work. Symptoms may be:

  • Nausea.
  • Vomiting.
  • Diarrhea.
  • Lethargy (feeling tired, drowsy, sluggish).
  • Little or no urine output.

Tell your provider right away if you have any of these symptoms.

Infection and Low White Blood Cell Count (Leukopenia or Neutropenia)

This medication can cause serious infections, with or without a decrease in white blood cell counts.

White blood cells (WBC) help your body fight infection. While you are having cancer treatment, your WBC count can drop, putting you at a higher risk of an infection. Tell your provider right away if you have a fever (a temperature greater than 100.4°F or 38°C), sore throat or cold, shortness of breath, cough, burning with urination, or a sore that doesn't heal.

Tips for preventing infection:

  • Hand washing,  both yours and your visitors, is the best way to prevent the spread of infection.
  • Avoid large crowds and people who are sick (those who have a cold, fever, or cough, or if someone you live with has these symptoms).
  • When working outside, wear clothes that protect you, like long pants and gloves.
  • Do not handle pet waste.
  • Keep all cuts and scratches clean.
  • Shower or bathe daily.
  • Brush your teeth at least twice a day.
  • Do not cut cuticles or ingrown nails. You may wear nail polish, but not fake nails.
  • Ask your providers before scheduling dental appointments or procedures.

Ask your providers before you or someone you live with has any vaccines

Low Red Blood Cell Count (Anemia)

Anemia is when your red blood cell count is lower than normal. Red blood cells carry oxygen to the tissues in your body. When your red cell count is low, you may feel tired or weak. Tell your providers if you have shortness of breath, trouble breathing, or pain in your chest. If your count gets too low, you may receive a blood transfusion.

Low Platelet Count (Thrombocytopenia)

Platelets are blood cells that help your blood clot. Thrombocytopenia is when your platelet count is lower than normal, and you are at a higher risk of bleeding. Tell your providers if you have any bruising or bleeding, including nose bleeds, bleeding gums, or blood in your urine or stool. If your count gets too low, you may receive platelets from a donor. 

  • Do not use a razor (an electric razor is fine).
  • Do not do activities that can cause injury or bleeding.
  • Talk to your provider before taking any non-steroidal, anti-inflammatory medications (NSAIDs) like Motrin/Advil (ibuprofen), Aleve (naproxen), Celebrex (celecoxib), and others. These can raise the risk of bleeding. 
  • Use a soft-bristle toothbrush to brush your teeth. Ask your provider about flossing or using toothpicks. 

Electrolyte Abnormalities

This medication can affect your electrolytes (potassium, magnesium, sodium, calcium, etc.). Your electrolyte levels will be checked with blood tests. If your levels get too low, you may be given electrolytes by IV (intravenously through your vein) or by mouth. Talk to your provider before taking any supplements. 

High Blood Sugar

This medication can cause high blood sugar in patients with and without diabetes. Symptoms can be:

  • Feeling more thirsty.
  • More frequent urination.
  • Feeling hungrier. 
  • Blurry vision.
  • Headaches.
  • Breath smelling like fruit.

All patients will have their blood sugar checked with blood tests. If you have diabetes and your blood sugars are higher than normal, talk to your provider. Tell your provider if you have any of these symptoms.

Kidney Problems

This medication can cause kidney problems, like an increased creatinine level. Your provider may monitor for kidney problems with blood tests. Symptoms may be:

  • Less urine output than normal.
  • Blood in the urine.
  • Swelling in the ankles.
  • Loss of appetite.

Tell your provider if you have any of these symptoms.

Liver Toxicity

This medication can cause liver toxicity, or liver problems, which your provider may monitor for with blood tests called liver function tests. Symptoms may be:

  • Yellowing of your skin or eyes.
  • Dark or brown urine.
  • Pain in your abdomen (belly).

Tell your provider if you have any of these symptoms.

Live Vaccines

You or anyone you live with should not get a live or live-attenuated vaccine while you are getting this medication. These include:

  • Herpes zoster (Zostavax) for shingles prevention.
  • Oral polio vaccine.
  • Measles vaccine.
  • Nasal flu vaccine (FluMist®), 
  • Rotavirus vaccine.
  • Yellow fever vaccines.

Talk to your provider about how and when you should get these vaccines.

Reproductive Concerns

There is a higher risk of health problems for your baby if you are pregnant, become pregnant, or get someone pregnant while on this medication. To lower the risk of birth defects, you should use birth control (contraception) to avoid pregnancy. Talk with your provider about what kind of birth control is safest for you and your partner.

If you can become pregnant, you will need to use effective birth control during treatment and for 1 week after the last dose of this medication, even if your menstrual cycle has stopped or changed. If you can get someone pregnant, you will need to use effective birth control during treatment and for 1 week after the last dose of this medication, even if you believe you are not producing sperm. You should not breastfeed during treatment and for 1 week after the last dose of this medication.