Tell your doctor if you are pregnant or plan to become pregnant. Your doctor may order a pregnancy test before starting this medication. You should not become pregnant while using belzutifan. Belzutifan may harm an unborn baby. Women of childbearing age should ask about reliable non-hormonal forms of birth control while using this medication and for 1 week after the last dose. Men with female partners of childbearing age should use reliable forms of birth control while using this medication and for 1 week after the last dose. If you or your partner becomes pregnant, talk to your doctor right away about the risks and benefits of this medication.


This medication is used to treat people who have a certain inherited disorder (von Hippel-Lindau disease). People with this disease may form tumors and fluid-filled sacs (cysts) in many different parts of the body. Tumors may be either noncancerous or cancerous. This medication is not a cure for von Hippel-Lindau disease. It is used to help treat certain tumors/growths caused by this disease that do not need surgery right away (such as in the kidneys, pancreas, brain/spinal cord). Belzutifan works by slowing or stopping the growth of tumor cells.

How to use Welireg 40 Mg Tablet Antineoplastic - Hypoxia Inducible Factor (HIF) Inhibitors

Read the Medication Guide provided by your pharmacist before you start taking belzutifan and each time you get a refill. If you have any questions, ask your doctor or pharmacist.

Take this medication by mouth with or without food as directed by your doctor, usually once daily. Swallow the tablets whole. Do not chew, crush, or split the tablets. The dosage is based on your medical condition and response to treatment.

Use this medication regularly to get the most benefit from it. To help you remember, take it at the same time each day.

If you vomit after taking a dose, do not take another dose. Take your next dose at the regular time on the next day.

Tell your doctor if your condition does not get better or if it gets worse.

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CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.