Toxoids are bacterial toxins which have been suppressed or made weak while the immunogenicity has been maintained. They are used as vaccines due to the fact that they induce an immune response to the original toxin.
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FDA article details GlaxoSmithKline's toxoid Kinrix, which is also known as Diphtheria and Tetanus Toxoids and Acellular Pertussis Adsorbed and Inactivated Poliovirus Vaccine, discussing packaging information, supporting documents, and indication for prescription. - Kinrix
http://www.fda.gov/BiologicsBloodVaccines/Vaccines/ApprovedProducts/ucm172495.htm
Consists of information about the safety of toxoids, including fetal risk, references, and questions and answers. - Tetanus & Diphtheria Toxoids
http://drugsafetysite.com/tetanusdiphtheria-toxoids-adult/