Phylobid tablets


  • Active Ingredient: Theophylline
  • 400 mg
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What is Phylobid?

The active ingredient of Phylobid brand is theophylline. Theophylline is a bronchodilator. It works by relaxing muscles in the lungs and chest, making the lungs less sensitive to allergens and other causes of bronchospasm. Each extended-release tablet for oral administration contains either 300 mg or 450 mg of anhydrous Theophylline. Tablets also contain as inactive ingredients: hypromellose, lactose monohydrate, magnesium stearate and povidone.

Used for

Phylobid is used to treat diseases such as: Apnea of Prematurity, Asthma, acute, Asthma, Maintenance.

Side Effect

Possible side effects of Phylobid include: restlessness; sleeplessness; fainting; Headache; dizziness; numbness or tingling in the hands, feet, or lips; nervousness; fast, slow, or irregular heartbeat.

How to Buy Phylobid tablets online?

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Is Phylobid safe to take if I'm pregnant or breastfeeding?

There are no adequate studies in pregnant women.

Phylobid is excreted in breast milk and may cause mild side effects such as irritability in the infant.

What is Phylobid, and how does it work (mechanism of action)?

Phylobid belongs to a class of medications called bronchodilators, used in treating asthma and other airway diseases. Asthma is a breathing problem caused by narrowing of the airways, the breathing passages that allow air to move in and out of the lungs. Airways can be narrowed due to accumulation of mucus, spasm of the muscles that surround these airways, or swelling of the lining of the airways. Airway narrowing leads to symptoms of shortness of breath, wheezing, cough, and congestion. The narrowed airways can open either spontaneously or with medications. Medications that open airways are called bronchodilators. Phylobid opens airways by relaxing the smooth muscles in the walls of the airways. Phylobid also can be helpful in patients with emphysema and chronic bronchitis when their symptoms are partially related to reversible airway narrowing. Phylobid also strengthens right heart function and diaphragm movement. Phylobid was approved by the FDA in April 1979.

Phylobid Overdose

A sudden overdose from taking too much Phylobid all at once is rare.

A chronic overdose, however, is not rare, especially if you have been taking a dose that is a little too high for a long time, or if your dose has recently been increased.

An overdose of Phylobid may cause slow heart rate, abnormal heart rate, seizures, circulatory system failure, and death.

If you suspect an overdose, you should contact a poison-control center or emergency room immediately. You can reach a poison-control center at (800) 222-1222.


This medication contains Phylobid. Do not take Theo 24, Theochron, Elixophyllin, aminophylline, or Uniphyl if you are allergic to Phylobid or any ingredients contained in this drug.

Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center immediately.

What Are Side Effects Associated with Using Phylobid?

Side effects of Phylobid at peak serum concentration less than 20 mcg/mL include:

Side effects of Phylobid at peak serum greater than 20 mcg/mL include:

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

Seizure drugs

These drugs may decrease the levels of Phylobid in your body. This means that it may not work to treat your condition. Examples of these drugs include:

Phylobid side effects

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

Call your doctor at once if you have:

severe or continued vomiting;

ongoing headache, trouble sleeping;

new signs of illness (especially fever);

low potassium level--leg cramps, constipation, irregular heartbeats, fluttering in your chest, increased thirst or urination, numbness or tingling, muscle weakness or limp feeling; or

high blood sugar--increased thirst, increased urination, dry mouth, fruity breath odor.

Serious side effects may be more likely in older adults.

Common side effects may include:

feeling restless or irritable.

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.

What side effects can this medication cause?

Phylobid may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away.

  • upset stomach
  • stomach pain
  • diarrhea
  • headache
  • restlessness
  • difficulty falling asleep or staying asleep
  • irritability

Some side effects can be serious. If you experience any of the following symptoms, call your doctor immediately:

  • vomiting
  • increased or rapid heart rate
  • irregular heartbeat
  • seizures
  • rash

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online ( or by phone (1-800-332-1088).

Before taking Phylobid,

  • tell your doctor and pharmacist if you are allergic to Phylobid, any other medications, or any of the ingredients in Phylobid preparations. Ask your pharmacist for a list of the ingredients.
  • tell your doctor and pharmacist what prescription medications you are taking, especially allopurinol (Zyloprim), azithromycin (Zithromax), carbamazepine (Tegretol), cimetidine (Tagamet), ciprofloxacin (Cipro), clarithromycin (Biaxin), diuretics ('water pills'), erythromycin, lithium (Eskalith, Lithobid), oral contraceptives, phenytoin (Dilantin), prednisone (Deltasone), propranolol (Inderal), rifampin (Rifadin), tetracycline (Sumycin), and other medications for infections or heart disease.
  • tell your doctor and pharmacist what prescription, nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: ephedrine, epinephrine, phenylephrine, phenylpropanolamine, or pseudoephedrine. Many other medications may also interact with Phylobid, so be sure to tell your doctor about all the medications you are taking, even those that do not appear on this list. Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
  • tell your doctor if you have or have ever had seizures, ulcers, heart disease, an overactive or underactive thyroid gland, high blood pressure, or liver disease or if you have a history of alcohol abuse.
  • tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking Phylobid, call your doctor.
  • tell your doctor if you use tobacco products. Cigarette smoking may decrease the effectiveness of Phylobid.

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