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The average duration of response remained fairly constant over the first six injection series, although patients with the most severe spasms had shorter intervals than patients with less severe symptoms. Twenty patients with hemifacial spasm (mean age 56.9 years) received 44 treatments (mean 1.9 treatments per patient): In 93.1% of cases there was total relief of periocular and perioral spasms, with a mean interval of 17.4 weeks. The average duration of response for the third series of treatments was much shorter than the mean durations for the first two treatments. Side effects were always transient and included ptosis (23.3%), dry eyes (18.1%), tearing (5.5%), and strabismus (1.4%). No patient had a systemic reaction to the drug. Chronic benign eyelid fasciculations were also successfully treated in 3 patients with single treatments.<\/jats:p>","DOI":"10.1017\/s0317167100027748","type":"journal-article","created":{"date-parts":[[2016,7,28]],"date-time":"2016-07-28T11:39:37Z","timestamp":1469705977000},"page":"276-280","source":"Crossref","is-referenced-by-count":41,"title":["Botulinum Toxin Injections in the Treatment of Blepharospasm, Hemifacial Spasm, and Eyelid Fasciculations"],"prefix":"10.1017","volume":"15","author":[{"given":"Stephen P.","family":"Kraft","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anthony 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