IRCT201109187575N1.

Methods	Randomised, parallel‐assignment, open‐label
Participants	Inclusion criteria: People with Bell's palsy, age over 10 years Exclusion criteria: more than 7 days have passed since the onset of paralysis; finding another cause for the paralysis Target sample size 180
Interventions	Group 1: prednisone 1 mg/kg body weight daily for 3 days. The treatment was tapered over the next 12 days Group 2: aciclovir, 400 mg every 5 hours per day for 10 days Group 3: combination of aciclovir and prednisone
Outcomes	Primary: House‐Brackmann scale every 15 days Treatment failure (no reduction of House‐Brackmann scale) at the end of month 3
Notes	Monocentre study, Arak University of Medical Sciences, Iran. Contact: dr.ashtiani@arakmu.ac.ir First enrolment in 2010 Recruitment reported to be complete