Before using histrelin, tell your doctor or pharmacist if you are allergic to it; or to similar drugs (e.g., leuprolide); 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, especially of: diabetes, heart disease (such as heart attack), stroke, high cholesterol, family history of sudden cardiac death.
If you are a man using this medication for prostate cancer, histrelin may weaken your bones and increase your risk for bone loss (osteoporosis) if used for a long time. Before using this medication, tell your doctor or pharmacist if you have osteoporosis or if you have any of the following risk factors for osteoporosis: long-term alcohol use, smoking, family history of osteoporosis and broken bones, use of certain medications (e.g., corticosteroids such as prednisone, certain anti-seizure drugs such as phenytoin).
This product is not approved for use in women. Histrelin must not be used during pregnancy. It may harm an unborn baby. Consult your doctor for details.
Irritation at the implant site (such as bruising, pain, redness), mood swings, or headache may occur. In men using this medication for prostate cancer, hot flashes (flushing), increased sweating, night sweats, tiredness, swelling of the ankles/feet, or constipation may occur. In girls using this medication for early puberty, breast tenderness or abnormal vaginal bleeding may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
Infrequently, breast tenderness/swelling may occur in men and boys as a result of lowered testosterone levels. Shrinking of the testicles and reduced sexual interest/ability may also occur in men. Talk to your doctor if these effects occur.
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.
If you are a man using this medication for prostate cancer, tell your doctor immediately if any of these unlikely but serious side effects occur: new/worsening bone pain, easily broken bones, increased thirst/urination.
Get medical help right away if any of these rare but serious side effects occur: chest/jaw/left arm pain, irregular heartbeat, weakness on one side of the body, slurred speech.
Rarely, a very serious problem with the pituitary gland (pituitary apoplexy) has been reported with similar drugs, usually in the first 2 weeks after starting treatment. Seek immediate medical attention if any of these very serious side effects occur: sudden severe headache, sudden severe mental/mood changes (e.g., severe confusion, difficulty concentrating), vision changes, severe vomiting, fainting.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention 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.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
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