- duration of anosmia or dysosmia <60 days - previous smell retraining - prior interventions for loss of smell (excluding those on flonase and azelastine) - contraindications for nasal budesonide treatment, as determined by the treating physician - active cigarette smoker or use of vapes - previous head trauma - congenital anosmia - history of brain tumor - neurocognitive disorders - multiple sclerosis - seizure disorder - cystic fibrosis - primary ciliary dyskinesia - history of nasal polyps - inability to self-report

- duration of anosmia or dysosmia <60 days - previous smell retraining - prior interventions for loss of smell (excluding those on flonase and azelastine) - contraindications for nasal budesonide treatment, as determined by the treating physician - active cigarette smoker or use of vapes - previous head trauma - congenital anosmia - history of brain tumor - neurocognitive disorders - multiple sclerosis - seizure disorder - cystic fibrosis - primary ciliary dyskinesia - history of nasal polyps - inability to self-report