Telfast contains fexofenadine hydrochloride, which is an antihistamine.
Telfast 120 mg is used in adults and adolescents from 12 years of age, to relieve symptoms associated with hay fever (seasonal allergic rhinitis) such as sneezing, itching, dripping or nasal congestion and itching, redness and tearing of eyes.
You should see a doctor if it gets worse or if it does not improve after 7 days.