Theophylline Side Effects
What should I watch for?
Visit your doctor or health care professional for regular checks on your progress. Your doctor or health care professional may schedule regular blood tests, especially at first. Tell your doctor if your symptoms do not improve or if they get worse.
There are many different brands of this medicine. Do not change your brand without checking with your health care professional. Different brands of this medicine may act differently in your body.
Tell all of your doctors that you are taking this medicine. Talk to your doctor before you start or stop ANY over-the-counter or prescription medicines. Also talk to your health care professional about foods that affect this medicine, like chocolate, coffee, teas and charcoal-broiled foods. If you smoke tobacco or marijuana you may affect the level of this medicine in your body. Alcohol may interfere with the effect of this medicine. Avoid alcoholic drinks.
This medicine may cause a decrease in vitamin B6. You should make sure that you get enough vitamin B6 while you are taking this medicine. Discuss the foods you eat and the vitamins you take with your health care professional.
Common and Rare Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
Incidence not known
Chest pain or discomfort
fast, slow, or irregular heartbeat
increase in urine volume
pounding or rapid pulse
Get emergency help immediately if any of the following symptoms of overdose occur:
Symptoms of overdose
Abdominal or stomach pain
confusion about identity, place, and time
decrease in frequency of urination
difficulty in passing urine (dribbling)
dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
fast, pounding, or irregular heartbeat or pulse
loss of appetite
muscle cramps or spasms
muscle pain or stiffness
nausea or vomiting
numbness or tingling in the hands, feet, or lips
pain or discomfort in the arms, jaw, back, or neck
shakiness in the legs, arms, hands, or feet
shortness of breath
unusual tiredness or weakness
vomiting of blood or material that looks like coffee grounds
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Incidence not known
unable to sleep
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.