Read the side effects of Theophylline as described in the medical literature. In case of any doubt consult your doctor or pharmacist.
Serious effects -
Death.
Most Common -
Nausea, vomiting, headache, and sleeplessness.
Gastrointestinal -
Abdominal pain, diarrhea and blood vomiting.
Metabolic -
Decrease in blood potassium level and increase in sugar.
Heart -
Fast heart rate and low blood pressure/shock.
Central Nervous System -
Nervousness, tremors, disorientation and seizures.
Other Precautions : * Avoid excess dosage.