A throat infection lasting for a month is considered chronic and is not typical for a standard viral sore throat. You should not self-medicate with antibiotics, as this persistent irritation could be caused by conditions like acid reflux (GERD), allergies, chronic tonsillitis, or a resistant bacterial infection. It is crucial to consult a doctor or an Ear, Nose, and Throat (ENT) specialist for a proper examination and diagnosis. For temporary symptomatic relief, you can gargle with warm salt water, use throat lozenges, and stay well-hydrated, but please seek professional medical evaluation to get the correct prescription.