<prompt> Griseofulvin is given for the treatment of onychomycosis for finger nail for a period of:2 weeks6 weeks2 months6 months  <response>: The treatment of dermatophytosis using Griseofulvin is as follows: Dosage - 125 - 250 QID with meal Finger nails - 4 - 6 months Toenails - 8 - 12 months Ref: Illustrated Synopsis of Dermatology and STDs By Neena Khanna, Page 121 