Theo ER ®

AA Pharma

Generic Name:

Product Illustration Form:


Why is it prescribed?

Theo ER ® contains theophylline.

Theophylline is used to treat symptoms of conditions such as asthma, chronic bronchitis and emphysema (e.g. shortness of breath, cough, troubled breathing).


Side Effects

Theo ER ® contains theophylline.

Along with its needed effects, theophylline may cause some unwanted or undesirable effects. The frequency and severity of these effects is dependant on many factors including dose, duration of therapy and individual response. Possible unwanted effects include:

  • nausea
  • vomiting
  • diarrhea
  • nervousness
  • loss of appetite
  • headache
  • trouble in sleeping
  • irritability
  • tremor
  • abdominal discomfort

  • difficult or fast breathing
  • bloody or black tarry stools
  • seizures
  • fast or irregular heartbeat
  • blood in vomit
  • muscle twitching
  • rash
  • flushing
  • frequent urination

If you suspect that you are experiencing unwanted effects with your theophylline, check with your pharmacist.


Precautions and Warnings for Theo ER ®

Theo ER ® contains theophylline

When starting this medication, it may take a few weeks for your physician to find the dose that is right for you. The doctor may draw some blood to help him/her determine how much theophylline is in your body and then adjust your dose if there is too much or too little. The dose can vary quite significantly from person to person, even if they are the same sex, height and weight. It is very important that the correct theophylline blood level be reached as inappropriate levels may result in serious unwanted effects.
Eating or drinking large quantities of products that are high in caffeine (chocolate, tea, coffee, soft drinks) can further increase theophylline's stimulatory effects on the central nervous system (enhanced sleeplessness, agitation, uncomfortable heart beat).
Drug Interactions: Due to potentially serious interactions, it is important to inform your doctor and pharmacist of all the other medications (prescription and over-the-counter) you are taking, no matter how insignificant they may seem. Some medications can effect the amount of theophylline in the blood. The following drugs and drug classes have been known to interact with theophylline:

  • beta-blockers (e.g. propranolol)
  • cimetidine (e.g.Tagamet®)
  • ciprofloxacin (Cipro®)
  • erythromycin (e.g. Erythromid®)
  • lithium (e.g. Carbolith®)
The use of tobacco may reduce the effectiveness of theophylline.
Use is not recommended in the following situations:
  • allergy to any xanthine (e.g. aminophylline)
  • confirmed or suspected peptic ulcer disease

Caution is recommended in the following situations:
  • liver problems
  • impaired kidney function
  • people over 60 years of age
  • heart disease
  • arrhythmias (irregular heart beat)
  • coronary artery disease
  • congestive heart failure
  • newborn or premature infants
  • high blood pressure
  • pneumonia
  • fever

Use in pregnancy: Consult your doctor or pharmacist if you suspect that you may be pregnant.
Use while breastfeeding: Consult your doctor or pharmacist before you begin breastfeeding.
Switching between brands: Products manufactured by different companies do not always deliver the same amount of theophylline, therefore the physician may have to readjust your dose after switching brands.


Patient Information

Theo ER® is a sustained release tablet that releases theophylline gradually throughout the day. For this reason, it is not very useful in a situation where fast relief of bronchospasm is required.
The tablets should never be chewed or crushed but may be cut in half to help swallowing.
It may be taken with food or milk if stomach upset occurs. Theo ER® should always be taken at the same time in relation to meals. This medication is meant to be taken at regular intervals around the clock, and should be taken exactly as directed by your doctor. If you miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses. Contact your pharmacist if you are not sure what to do.


Directions for Use

Dosing is individualized. The usual adult starting dose is 300 mg to 400 mg once daily; the maintenance dose is 400 mg to 600 mg once daily. Starting doses for children will be calculated based on weight in kilograms.


Lung Diseases Treated with this Drug

  • asthma
  • bronchitis
  • bronchospasm associated with COPD
  • chronic bronchitis (COPD)
  • COPD
  • emphysema (COPD)


Need More Information?

For more information contact your physician, pharmacist, other health care professional or for general questions call your local lung association.