Injections may effectively treat myoclonus, especially if the muscle jerks only occur in one area of the body. Botulinum toxins inhibit the release of a chemical messenger that causes muscles to contract. The injections have several possible side effects, including pain, bruising, or swelling at the injection site, headache, flu-like symptoms, dry eyes or excessive tearing, and fever. As with any treatment, doctor and patient must weigh the benefits against the detriments.

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