Class Name(s):

• 10:00 Antineoplastic Agents

Pronunciation:

• (nye" roe gay' se stat)

Brand Name(s):

• Ogsiveo^®

WHY is this medicine prescribed?

Nirogacestat is used to treat adults with desmoid tumors (a type of noncancerous tumors that occur most often in the stomach, arms, and legs) that cannot be removed by surgery. Nirogacestat is in a class of medications called gamma secretase inhibitors. It works by blocking the action of the abnormal protein that signals the tumors to grow. This helps to stop or slow tumor growth.

HOW should this medicine be used?

Nirogacestat comes as a tablet to take by mouth. It is usually taken with or without food twice a day for as long as your doctor recommends treatment. Take nirogacestat at around the same times every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take nirogacestat exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.

Swallow the tablets whole; do not split, chew, or crush them.

If you vomit after taking nirogacestat, do not take another dose. Continue your regular dosing schedule.

Your doctor may decrease your dose of nirogacestat, treat you with other medications, or interrupt or stop your treatment if you experience certain side effects. Be sure to tell your doctor how you are feeling during your treatment with nirogacestat.

Ask your pharmacist or doctor for a copy of the manufacturer's information for the patient.

Are there OTHER USES for this medication?

This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.

What SPECIAL PRECAUTIONS should I follow?

Before taking nirogacestat,

• tell your doctor and pharmacist if you are allergic to nirogacestat, any other medications, or any of the ingredients in nirogacestat tablets. Ask your pharmacist for a list of the ingredients.
• tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
• if you are taking antacids (Maalox, Mylanta, Tums); H₂ blockers such as cimetidine (Tagamet), famotidine (Pepcid), nizatidine (Axid), and ranitidine; or proton pump inhibitors such as lansoprazole (Prevacid), omeprazole (Prilosec), pantoprazole (Protonix), and rabeprazole (Aciphex), take them 2 hours before or 2 hours after nirogacestat.
• the following nonprescription or herbal product may interact with nirogacestat: St. John's Wort. Be sure to let your doctor and pharmacist know that you are taking this medication before you start taking nirogacestat. Do not start this medication while taking nirogacestat without discussing with your healthcare provider.
• tell your doctor if you have or have ever had low levels of phosphate or potassium in the blood or liver problems.
• you should know that nirogacestat may interfere with the normal menstrual cycle (period) in women and decrease in the number of sperm (male reproductive cells) in men. However, you should not assume that you cannot get pregnant, or that you cannot get someone else pregnant. Tell your doctor if you are pregnant, plan to become pregnant, or plan to father a child. You or your partner should not become pregnant during your treatment with nirogacestat. If you are a female that can become pregnant, you will need to have a pregnancy test before you begin treatment, and you should use effective birth control during your treatment and for 1 week after your final dose. If you are a male with a female partner that can become pregnant, use effective birth control during your treatment and for 1 week after your final dose. If you or your partner become pregnant while taking nirogacestat, call your doctor. Nirogacestat may harm the fetus.
• tell your doctor if you are breast-feeding or plan to breastfeed. You should not breastfeed while you are taking nirogacestat and for 1 week after the final dose.
• you should know that this medication may decrease fertility in men and women. Talk to your doctor about the risks of taking nirogacestat.
• you should know that nirogacestat often causes diarrhea, which can be severe. Your doctor may also tell you to drink plenty of liquids, make changes in your diet, or take other medications to control the diarrhea. Call your doctor immediately if you have severe diarrhea (diarrhea that does not stop) or diarrhea that does not get better after taking an anti-diarrhea medication. Call your doctor immediately if you experience any of the following symptoms of dehydration: extreme thirst, dry mouth and/or skin, decreased urination, or fast heartbeat.

What SPECIAL DIETARY instructions should I follow?

Do not eat grapefruit, starfruit, or Seville oranges (sometimes used in marmalades), or drink grapefruit juice while taking this medication.

What should I do IF I FORGET to take a dose?

Take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.

What SIDE EFFECTS can this medicine cause?

Nirogacestat may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

• nausea
• stomach pain
• mouth sores
• rash
• hair loss
• headache
• runny nose, nasal congestion, sneezing, or sore throat
• cough
• shortness of breath
• tiredness

Some side effects can be serious. If you experience any of these symptoms or those listed in the SPECIAL PRECAUTIONS section, call your doctor immediately:

• changes in menstrual cycle
• hot flashes
• night sweats
• vaginal dryness
• muscle pain or weakness
• new or changing skin lesions

Nirogacestat may increase the risk of developing skin cancer. Talk to your doctor about the risks of taking this medication.

Nirogacestat may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online (http://www.fda.gov/Safety/MedWatch) or by phone (1-800-332-1088).

What should I do in case of OVERDOSE?

In case of overdose, call the poison control helpline at 1-800-222-1222. Information is also available online at http://www.poisonhelp.org/help. If the victim has collapsed, had a seizure, has trouble breathing, or can't be awakened, immediately call emergency services at 911.

What should I know about STORAGE and DISPOSAL of this medication?

Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from light, excess heat and moisture (not in the bathroom).

Keep all medication out of sight and reach of children as many containers are not child-resistant. Always lock safety caps. Place the medication in a safe location - one that is up and away and out of their sight and reach. http://www.upandaway.org

Dispose of unneeded medications in a way so that pets, children, and other people cannot take them. Do not flush this medication down the toilet. Use a medicine take-back program. Talk to your pharmacist about take-back programs in your community. Visit the FDA's Safe Disposal of Medicines website http://goo.gl/c4Rm4p for more information.

What OTHER INFORMATION should I know?

Keep all appointments with your doctor and the laboratory. Your doctor may order certain lab tests before and during your treatment to check your body's response to nirogacestat.

Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription.

Keep a written list of all of the prescription and nonprescription (over-the-counter) medicines, vitamins, minerals, and dietary supplements you are taking. Bring this list with you each time you visit a doctor or if you are admitted to the hospital. You should carry the list with you in case of emergencies.

This report on medications is for your information only, and is not considered individual patient advice. Because of the changing nature of drug information, please consult your physician or pharmacist about specific clinical use.

The American Society of Health-System Pharmacists, Inc. represents that the information provided hereunder was formulated with a reasonable standard of care, and in conformity with professional standards in the field. The American Society of Health-System Pharmacists, Inc. makes no representations or warranties, express or implied, including, but not limited to, any implied warranty of merchantability and/or fitness for a particular purpose, with respect to such information and specifically disclaims all such warranties. Users are advised that decisions regarding drug therapy are complex medical decisions requiring the independent, informed decision of an appropriate health care professional, and the information is provided for informational purposes only. The entire monograph for a drug should be reviewed for a thorough understanding of the drug's actions, uses and side effects. The American Society of Health-System Pharmacists, Inc. does not endorse or recommend the use of any drug. The information is not a substitute for medical care.

AHFS^® Patient Medication Information™ Copyright, 2025. The American Society of Health-System Pharmacists^®, 4500 East-West Highway, Suite 900, Bethesda, Maryland. All Rights Reserved. Duplication for commercial use must be authorized by ASHP.

Selected Revisions: February 15, 2024.