Metaproterenol

What Is Metaproterenol?

Metaproterenol is a bronchodilator. It works by relaxing muscles in the airways to improve breathing.
Metaproterenol is used to treat conditions such as asthma, bronchitis, and emphysema.
Metaproterenol may also be used for purposes not listed in this medication guide.
You should not use metaproterenol if you have a heart rhythm disorder that causes fast heartbeats.
You should not use metaproterenol if you are allergic to it, or if you have a heart rhythm disorder that causes fast heartbeats.
To make sure metaproterenol is safe for you, tell your doctor if you have:

• heart disease, high blood pressure, heart rhythm disorder;
• epilepsy or another seizure disorder;
• low levels of potassium in your blood;
• diabetes; or
• an overactive thyroid.

FDA pregnancy category C. It is not known whether metaproterenol will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medication.
It is not known whether metaproterenol passes into breast milk or if it could harm a nursing baby. Tell your doctor if you are breast-feeding a baby.
Metaproterenol should not be given to a child younger than 6 years old.

Metaproterenol Side Effects

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

• chest pain, fast heart rate;
• pounding heartbeats or fluttering in your chest;
• a light-headed feeling, like you might pass out;
• tremors; or
• worsening or no improvement in your symptoms.

Common side effects may include:

• nervousness;
• headache;
• dizziness, drowsiness;
• nausea, diarrhea, upset stomach, dry mouth;
• tired feeling; or
• sleep problem (insomnia).

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.

Metaproterenol Interactions

Avoid situations that may trigger an asthma attack such as exercising in cold, dry air; smoking; breathing in dust; and exposure to allergens such as pet fur.
Tell your doctor about all medicines you use, and those you start or stop using during your treatment with metaproterenol, especially:

• an MAO inhibitor--isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine; or
• a beta blocker--atenolol, bisoprolol, carvedilol, labetalol, metoprolol, nadolol, nebivolol, propranolol, sotalol, and others.

This list is not complete. Other drugs may interact with metaproterenol, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.

Metaproterenol Dosage

Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.
Measure liquid medicine with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.
Use metaproterenol regularly to get the most benefit. Get your prescription refilled before you run out of medicine completely.
Seek medical attention if you think your asthma medications are not working as well. An increased need for medication could be an early sign of a serious asthma attack.
To make sure this medication is not causing harmful effects on your lungs, you may need to have chest X rays or other frequent lung function tests.
Store at room temperature away from moisture, heat, and light.
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.