Mometasone is a steroid. It prevents the release of substances in the body that cause inflammation.

Mometasone inhalation is used to prevent asthma attacks. It will not treat an asthma attack that has already begun.

Mometasone may also be used for purposes not listed in this medication guide.

Mometasone inhalation is not a rescue medicine for asthma attacks. Use only fast-acting inhalation medicine for an attack. Seek medical attention if your breathing problems get worse quickly, or if you think your asthma medications are not working as well.

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

Mometasone inhalation is not a rescue medicine for asthma attacks. Use only fast-acting inhalation medicine for an attack. Seek medical attention if your breathing problems get worse quickly, or if you think your asthma medications are not working as well.

Read and carefully follow any Instructions for Use provided with your medicine. Ask your doctor or pharmacist if you do not understand these instructions.

To help prevent thrush (a yeast infection in the mouth or throat), rinse your mouth with water and spit it out without swallowing after each use of this medicine.

Mometasone can weaken (suppress) your immune system, and you may get an infection more easily.

It may take up to 2 weeks before your symptoms improve. Keep using the medication as directed and call your doctor if your symptoms do not improve after 1 week of treatment.

If you also use an oral steroid medication, you should not stop using it suddenly. Follow your doctor's instructions about tapering your dose.

Your dose needs may change if you have surgery, are ill, are under stress, or have recently had an asthma attack. If you had been taking an oral (taken by mouth) steroid, you may need to restart the oral medicine. Do not change your medication dose or schedule without your doctor's advice.

Store at room temperature away from moisture and heat. When you first open the foil pouch and remove the inhaler device, write the date on the device. Throw away the inhaler when the dose counter shows "00."

Keep the cap on your inhaler when not in use. Keep the inhalation aerosol canister away from open flame or high heat. The canister may explode if it gets too hot. Do not puncture or burn an empty inhaler canister.

Do not wash your inhaler device or allow it to get wet. Wipe the mouthpiece with a clean dry tissue or cloth.

You should not use mometasone inhalation if you are allergic to mometasone, or to milk proteins.

Tell your doctor if you have ever had:

• liver disease;

• herpes infection of the eyes;

• glaucoma, cataracts, or other vision problems;

• low bone mineral density, osteoporosis; or

• any illness or infection, including tuberculosis.

Tell your doctor if you are pregnant. It is not known whether this medicine will harm an unborn baby. However, having untreated or uncontrolled asthma during pregnancy may cause complications such as low birth weight, premature birth, or eclampsia (dangerously high blood pressure that can lead to medical problems in both mother and baby). The benefit of treating asthma may outweigh any risks to the baby.

It may not be safe to breastfeed while using this medicine. Ask your doctor about any risk.

Do not give this medicine to a child younger than 4 years old. Asmanex HFA should not be given to a child younger than 5 years old.

Long-term use of steroids may lead to bone loss (osteoporosis), especially if you smoke, if you do not exercise, if you do not get enough vitamin D or calcium in your diet, or if you have a family history of osteoporosis. Talk with your doctor about your risk of osteoporosis.

Use the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not use two doses at one time.

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Avoid being near people who are sick or have infections. Call your doctor for preventive treatment if you are exposed to chickenpox or measles. These conditions can be serious or even fatal in people who are using mometasone.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Mometasone inhalation may cause serious side effects. Call your doctor at once if you have:

• wheezing, choking, or other breathing problems after using this medication;

• blurred vision, tunnel vision, eye pain, or seeing halos around lights;

• worsening asthma symptoms;

• signs of infection--fever, feeling tired, body aches, pain, chills;

• signs of thrush (a fungal infection)--sores or white patches in your mouth or throat, trouble swallowing; or

• symptoms of low adrenal gland hormones--extreme tiredness or weakness, nausea, vomiting, a light-headed feeling (like you might pass out);

Steroid medicine can affect growth in children. Tell your doctor if your child is not growing at a normal rate while using mometasone inhalation.

Common side effects of mometasone inhalation may include:

• fungal infection;

• increased sinus allergy symptoms (runny nose, stuffy nose, sinus pain), sore throat, nosebleed;

• headache;

• muscle or bone pain, back pain;

• flu symptoms;

• indigestion, upset stomach;

• menstrual pain; or

• hoarseness or deepened voice.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Sometimes it is not safe to use certain medications at the same time. Some drugs can affect your blood levels of other drugs you take, which may increase side effects or make the medications less effective.

Tell your doctor about all your other medicines, especially:

• nefazodone;

• an antibiotic--clarithromycin, telithromycin;

• antifungal medicine--itraconazole, ketoconazole;

• an antidepressant; or

• antiviral medicine to treat HIV/AIDS--atazanavir, cobicistat, indinavir, nelfinavir, ritonavir, saquinavir.

This list is not complete. Other drugs may affect mometasone, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.