Tefin Terbinafine HCI Spray Fungal Treatment 10mg/g 15ml TEFIN Terbinafine HCl Spray is for fungal treatment. - Athlete's foot - Jock itch - Ringworm Recommended dosage: Apply TEFIN Terbinafine HCl Spray 10mg/g to the affected areas once a day, for one week. Spray from a distance of 5cm to 10cm. Regular application is essential for successful treatment. Treatment should be continued for two weeks after all clinical signs have disappeared. Attention to hygiene is important in management of fungal diseases. particularly of the folds and the feet. If no improvement is seen after 4 weeks, diagnosis should be reviewed.