Harka-Verm Is A Liquid Wormer Effective Against Ringworm And Hairworm In Racing Pigeons And Cage Birds For Use Against Roundworm And Hairworm Safe And Easy To Use Dosage: 6Ml Harka-Verm To 2 Litres Of Drinking Water For 3 Days Contains Levamisole Safe To Use On Cage Birds (Dilution May Need To Be Adjusted For Use With Cage Birds)