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Relugolix is used to treat prostate cancer in men. It is not a cure. Most types of prostate cancer need the male hormone testosterone to grow and spread. Relugolix works by reducing the amount of testosterone that the body makes. This helps slow or stop the growth of cancer cells.

Read the Patient Information Leaflet if available from your pharmacist before you start using relugolix 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 other medications you may be taking. Be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

Do not increase your dose or take this drug more often than directed. Your condition will not improve any faster, and your risk of side effects will increase.

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

Since this drug can be absorbed through the skin and lungs and may harm an unborn baby, women who are pregnant or who may become pregnant should not handle this medication or breathe the dust from the tablets.

Hot flashes (flushing), muscle/joint pain, tiredness, constipation, and diarrhea may occur. Reduced sexual interest/ability and weight gain may also occur as a result of lowered testosterone levels. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor right away if you have any serious side effects, including: signs of kidney problems (such as a change in the amount of urine), easy bleeding/bruising.

Get medical help right away if you have any very serious side effects, including: chest pain, fast/slow/irregular heartbeat, severe dizziness, fainting.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Before taking relugolix, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history.

Relugolix may cause a condition that affects the heart rhythm (QT prolongation). QT prolongation can rarely cause serious (rarely fatal) fast/irregular heartbeat and other symptoms (such as severe dizziness, fainting) that need medical attention right away.

The risk of QT prolongation may be increased if you have certain medical conditions or are taking other drugs that may cause QT prolongation. Before using relugolix, tell your doctor or pharmacist of all the drugs you take and if you have any of the following conditions: certain heart problems (heart failure, slow heartbeat, QT prolongation in the EKG), family history of certain heart problems (QT prolongation in the EKG, sudden cardiac death).

Low levels of potassium or magnesium in the blood may also increase your risk of QT prolongation. This risk may increase if you use certain drugs (such as diuretics/"water pills") or if you have conditions such as severe sweating, diarrhea, or vomiting. Talk to your doctor about using relugolix safely.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

Older adults may be more sensitive to the side effects of this drug, especially QT prolongation (see above).

This medication should not be used by women, especially during pregnancy. It may harm an unborn baby. Consult your doctor for more details. Men with female partners of childbearing age should use reliable forms of birth control during treatment and for 2 weeks after stopping treatment. If your partner becomes pregnant or thinks she may be pregnant, tell the doctor right away.

Store in original container at room temperature away from light and moisture. Do not store in the bathroom. Keep the desiccant (drying agent) in the bottle. Keep all medications away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.

Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Other medications can affect the removal of relugolix from your body, which may affect how relugolix works. Examples include erythromycin, rifampin, among others.

This medication may interfere with certain lab tests (including pituitary gonadal function), possibly causing false test results. Make sure lab personnel and all your doctors know you use this drug.

If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.

If you miss a dose and it is within 12 hours of the time you usually take the dose, take it as soon as you remember. If it is more than 12 hours from the time you usually take the dose, skip the missed dose. Take your next dose at the regular time. Do not double the dose to catch up.

Lab and/or medical tests (such as PSA/testosterone levels, liver function, blood glucose, triglyceride levels) should be done while you are taking this medication. Keep all medical and lab appointments. Consult your doctor for more details.