†Usually injected if shoulder is involved. Injections to the levator scapulae may be associated with increased risk of upper respiratory infection and dysphagia.

‡If contributing, dose is always cut in half when injecting sternocleidomastoids for anterocollis. Patients with smaller neck muscle mass, or patients who require bilateral injections into the sternocleidomastoid muscle, have been reported to be at greater risk of dysphagia. Limiting the dose injected into the sternocleidomastoid muscle to =100 U may decrease the occurrence of dysphagia.

In patients without head tilt, when injecting in the back of the neck, it is critical that injections be symmetrical in order to avoid tilting of the head.