Symptoms of overdose may be related to the pharmacological effects of benzocaine. Its systemic absorption in case of an overdose can be manifested by drowsiness, anxiety, excitation, in severe cases - seizures. Very rarely large doses of benzocaine can cause methaemoglobinemia, which is manifested by respiratory disorders and cyanosis. Intravenous administration of methylene blue is a specific tool in the treatment of this condition.
In the case of a significant excess of the recommended single and daily doses of shark liver oil, there may be a tendency to accelerate blood clotting.