Flonase (fluticasone nasal spray) is a corticosteroid used to reduce inflammation in the nasal passages and is commonly used for allergies. While it doesn’t treat cough directly, it can help relieve a chronic dry or tickly cough caused by post-nasal drip, where mucus from the nose drips down the throat and triggers coughing. By reducing nasal congestion and mucus production, Flonase can decrease throat irritation and help control this type of cough. It’s especially useful for people with allergic rhinitis or chronic sinus inflammation. However, it won’t be effective for coughs caused by infections, asthma, or acid reflux. For best results, it should be used consistently for several days to build up its anti-inflammatory effects.