title: [Levamisole does not prevent lesions of recurrent aphthous stomatitis: a double-blind placebo-controlled clinical trial].
abstract: OBJECTIVE
  to utilize a double-blind protocol to provide clarification about the safety and effectiveness of levamisole in the treatment of recurrent aphthous stomatitis.
  
  
  METHODS
  Fourteen patients took a decreasing dose of oral levamisole for six months (initial dose 150mg three times a week) and ten others were placebo control patients. All were evaluated monthly.
  
  
  RESULTS
  The number of crises had a tendency to decrease in both groups, but without a difference between groups. The number of lesions diminished significantly in the two groups, but upon comparison the difference was not significant. Duration of the lesions diminished significantly in the placebo, however when compared to the levamisole group, difference was not significant during treatment. The intensity of pain was significantly lower in the two groups, but upon comparison, pain was significantly lower in the placebo group. The final global evaluation showed improvement in 50% of patients of the levamisole group and in 70% of the placebo, without a significant difference between treatments. No difference in the frequency of collateral effects was observed between groups.
  
  
  CONCLUSIONS
  Levamisole, as used in this protocol, is a safe drug. When compared with the placebo, levamisole is not effective in the prophylactic treatment of recurrent aphthous stomatitis. The placebo effect is important in diseases where emotional factors affect recurrence or expression of symptoms.
authors.affiliation: departamento de Otorrinolaringologia e Cirurgia de Cabeça e Pescoço, Universidade Federal de São Paulo, São Paulo, SP. lucweckx@uol.com.br
authors.forename: Luc Louis Maurice
authors.initials: LL
authors.lastname: Weckx
authors.forename: Cleonice Hitomi Watashi
authors.initials: CH
authors.lastname: Hirata
authors.forename: Marilda Aparecida Milanez Morgado de
authors.initials: MA
authors.lastname: Abreu
authors.forename: Vilma Ciorla
authors.initials: VC
authors.lastname: Fillizolla
authors.forename: Olga Maria Panhoca da
authors.initials: OM
authors.lastname: Silva
mesh_terms: D000276:Adjuvants, Immunologic / Q000009:adverse effects / Q000627:therapeutic use*; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007978:Levamisole / Q000009:adverse effects / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D055502:Secondary Prevention; D013281:Stomatitis, Aphthous / Q000188:drug therapy / Q000517:prevention & control*; D055815:Young Adult
chemical_list: D000276:Adjuvants, Immunologic; D007978:Levamisole