Caffeine attenuates CNS oxygen toxicity in rats.

We tested the effect of caffeine, on hyperoxia-induced seizures. Thirty-seven rats with chronic cortical electrodes were injected i.p. with caffeine (1.25, 2.5, and 10 mg/kg) or vehicle before exposure to 0.5 MPa oxygen and 17 rats to oxygen with 5% CO2 at 0.5 MPa. EEG monitoring and spectral analysis of EEG activity were carried out. Caffeine significantly prolonged the latent period to the onset of seizures (P < 0.05 in ANOVA), in a dose-related manner. Our results suggest that caffeine may be used in low doses for protection against hyperoxia-induced seizures.