Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop using theophylline and call your doctor at once if you have any of these serious side effects:
seizure (convulsions); ;
worsening of your condition, or symptoms of new illness; ;
severe or ongoing nausea and vomiting, headache, fast or uneven heart rate, and trouble sleeping (insomnia); ;
coughing up blood or vomit that looks like coffee grounds; ;
ongoing fever; ;
feeling restless, irritable, nervous, or jittery. ;
tremors; or ;
urinating more than usual. .
Less serious side effects may include:
mild nausea, loss of appetite, weight loss; ;
restlessness, tremor, or insomnia; or ;
headache, lightheadedness, or dizziness. .
This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.
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