Potentiative interactions between caffeine and various teratogenic agents

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Abstract
Acetazolamide and inhibitors of DNA synthesis (hydroxyurea, 5-fluoro-2′-deoxyuridine), RNA synthesis (actinomycin D), and protein synthesis (cycloheximide, emetine) were each administered to pregnant rats together with caffeine at doses where each agent alone caused minimal embryotoxicity. Caffeine co-administered with any of the other agents induced a powerful potentiative response. It is not clear from the present experiments whether much lower caffeine dosage, as normally encountered in humans, would potentiate embryotoxicity due to other agents.