Older adults may be more likely to have side effects from theophylline.

These symptoms could be signs of too much theophylline in your blood.

Store theophylline at room temperature, away from moisture, heat, and light.

High blood levels of theophylline cause increased side effects.

When the medicine level in the blood is within a safe range, theophylline has not been shown to affect learning.

There are many other medicines that can interact with theophylline.

You may take theophylline with or without food, but take it the same way every time.

Smoking changes the way your body uses theophylline, and you may need to use a different dose.

Before taking theophylline, tell your doctor if you are using any of the following drugs:

Evodia might increase how quickly the body gets rid of theophylline.

Your doctor may want to monitor your theophylline blood levels.

Stop using theophylline and call your doctor at once if you have any of these serious side effects:

Caffeine works in similar ways in the body as theophylline.

Caffeine may increase some of the side effects of theophylline.

Use of some prescription medicines, such as albuterol or theophylline.

Your pharmacist can provide more information about guaifenesin and theophylline.

If there are any changes in the brand, strength, or type of theophylline you use, your dosage needs may change.

Your doctor also will check the level of theophylline in your blood regularly to make sure it is not too high.

The effect of theophylline therapy on plasma pyridoxal-5-phosphate and pyridoxal levels.

Flumequine was found to have no effect on theophylline pharmacokinetics.

The evidence that theophylline is of benefit in such cases is inconclusive.

In rare cases, theophylline may be used instead of another asthma medicine:

These may make theophylline's side effects worse, especially jittery nerves and headaches.

High-fat meals may increase theophylline levels in the body.

Xanthinol is a drug prepared from theophylline used as a vasodilator.