Strefen contains flurbiprofen. Flurbiprofen belongs to a group of drugs called nonsteroidal anti-inflammatory drugs (INEs) that have analgesic, antipyretic and anti-inflammatory properties. It is used to relieve symptoms of sore throats, such as irritation, pain, difficulty swallowing and throat inflammation in adults and adolescents from 12 years of age.
You should see a doctor if it gets worse or if it does not improve after 3 days of treatment.