Hi, A persistent cough with postnasal drip can be caused by various underlying conditions, such as allergies, sinus infections, asthma, or acid reflux. Since you have been on antibiotics, steroids, and allergy medication for a while, and your symptoms persist, it is important to see an ENT specialist for a proper evaluation and diagnosis. Meanwhile, here are some remedies that may help alleviate your symptoms. Drink plenty of fluids, especially warm fluids like tea with honey, to soothe your throat and thin the mucus. Use a humidifier or take a steamy shower to loosen the mucus and relieve congestion. Gargle with salt water to help reduce inflammation and clear mucus. Avoid irritants such as smoke, pollution, and strong scents. Elevate your head with extra pillows at night to prevent mucus from pooling in your throat. Avoid eating late at night or lying down right after a meal to prevent acid reflux. Consider trying over-the-counter cough suppressants, such as dextromethorphan, but be sure to consult with your doctor before taking any new medication. Remember to follow up with your ENT specialist for further evaluation and treatment. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician