Theo-Dur

Be aware that a flu shot, influenza itself, or another viral infection may make your usual dose of theophylline act like an overdose. Consult your doctor if you anticipate getting a flu shot, or if you think you have the flu; you may need a temporary dosage reduction.

A mild overdose of theophylline may cause nausea and restlessness. Taking too much over a long period of time may cause serious heartbeat irregularities, convulsions, or even death. If at any time you suspect symptoms of an overdose of theophylline, seek medical attention immediately.