theophylline and theobromine, which are chemicals similar to caffeine.
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headache, nervousness, sleep problems, vomiting, diarrhea, irritability, irregular heartbeat, tremor, heartburn, dizziness, ringing in the ears, convulsions, and confusion.
If you are pregnant or breast-feeding, oolong tea in small amounts is probably not harmful. However, do not drink more than three cups a day of oolong tea. Too much caffeine might cause premature delivery, low birth weight, and harm to the baby.
Caffeine is probably safe in children in amounts commonly found in foods.
Do not take oolong tea if:
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You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.