Adverse reactions have been divided by frequency groups using the following criteria: Very common (≥1/10); Common (≥1/100 to <1/10); Uncommon (≥1/1,000 to <1/100); Rare (≥1/10,000 to <1/1,000); Very rare (<1/10,000); Not known (cannot be estimated from the available data). (See table.)

All these reactions have more frequently been observed in hyperimmunised subjects; particularly in the case of too frequent boosters.
Cases of brachial neuritis and Guillain-Barré syndrome have also been reported after the administration of other vaccines that contain tetanus toxoid.
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