It is very important that your doctor check the progress of you or your child at regular visits to make sure that this medicine is working properly. Blood tests may be needed to check for unwanted effects. Be sure to keep all appointments.
For female patients: You should not take this medicine if you are pregnant or may become pregnant. Using this medicine while you are pregnant can harm your unborn baby. If you think you have become pregnant while using the medicine, tell your doctor right away.
For children using nafarelin spray for central precocious puberty: The medicine can cause a brief increase in blood levels of some hormones. During this time, you may notice more signs of puberty in your child, including light vaginal bleeding and breast enlargement in girls. If your child's symptoms do not improve within 4 weeks, or if they get worse, call your doctor.
For adult women using nafarelin spray for endometriosis:
- For the first few days of treatment, the symptoms of your condition may get worse. This is normal. Do not stop using this medicine. Talk with your doctor if you have concerns about this.
- During the time you are receiving nafarelin, your menstrual period may not be regular or you may not have a menstrual period at all. This is to be expected when being treated with this medicine. If regular menstruation does not begin within 2 to 3 months after you stop using this medicine, check with your doctor.
- During the time you are using nafarelin spray, you should use birth control methods that do not contain hormones, such as condoms, IUD, a diaphragm or a cervical cap with a spermicide. If you have any questions about this, check with your doctor.
- Use a water-based vaginal lubricant product if dryness of the vagina causes problems, such as pain during sexual intercourse. Make sure the lubricant you choose can be used with a latex birth control device if you are using one. Some lubricants contain oils, which can break down the latex rubber of condoms, a cervical cap, or a diaphragm, and cause them to rip or tear.
- If you suspect you may have become pregnant, stop using this medicine and check with your doctor. There is a chance that continued use of nafarelin during pregnancy could cause birth defects or a miscarriage.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.