Botulinum toxin A injections and adverse effects to mimic muscle in TMD myofascial pain treatment: a case report

Even though the patient experienced adverse effects (temporary paralysis of the m.Risorius) after the botulinum toxin A injections she also experienced a noticeable reduction in muscle pain and headache attributed to temporomandibular disorders after the injections and after 6 months still reported reduced pain in the head and neck area. (characteristic pain intensity and graded chronic pain scale values were lower than before the study). Although the paper indicates possible positive outcomes of botulinum toxin A injections for patients suffering from myalgia in mastication muscles and temporomandibular disorders associated headache, there are also adverse effects to consider before making any decision on botulinum toxin A injections.