The onset of action varies depending on the type of allergy medication. Antihistamines may start working within 30 minutes to an hour after ingestion, while nasal corticosteroids may take several days to achieve their full effect.
The onset of action varies depending on the type of allergy medication. Antihistamines may start working within 30 minutes to an hour after ingestion, while nasal corticosteroids may take several days to achieve their full effect.