Article in English: Over-the-counter medicines like oral decongestants and nasal sprays can be very effective if you have excess mucus but still need to function at work or school; however, you should not take them for longer than about three days.  Taking these products for longer than three days can lead to a boomerang effect in which your mucus builds up even more than it did before. Many of these products also have side effects, including increased blood pressure and heart rate. Decongestants give relief to nasal congestion by reducing the swelling of the nasal tissues in the nasal passages. The mucus is dried up in the lungs, allowing the airway passages to open. The mucus is able to easily pass through, preventing an increase in mucus production.  Over-the-counter (OTC) decongestants come in 12 hour or 24 hour treatments. Try Tylenol Cold and Flu or Advil Cold and Sinus. Decongestants are prepared in different forms such as pills, liquids, and nasal sprays. Before taking decongestants, take the time to read the label and ingredients of the medications. If you have hypertension, seek medical counsel before taking any decongestants that contain the active ingredients phenylephrine or pseudoephedrine, because these can elevate blood pressure. A cough suppressant, such as dextromethorphan, inhibits the cough reflex and reduces the adhesiveness and surface tension of mucus. This allows mucus to exit the body more easily, helps relieve chest pain caused by excessive coughing, and removes secretions from the upper and lower airways. Guaifenesin, which can be found in mucoactive agents such as Mucinex, is a cough expectorant that thins the mucus for faster and easier release from the respiratory passage.  You may benefit from a medication that combines both dextromethorphan and guaifenesin, such as Robitussin DM. These medications can serve as both an expectorant and a cough suppressant. Side effects that you need to watch out for include nausea and vomiting, headache, and dizziness. Nasal spray is medication that is sprayed...

Summary in Vietnamese:
Sử dụng một cách thận trọng. Uống thuốc thông mũi để giảm ngạt mũi. Dùng si-rô ho và thuốc trị viêm phế quản. Sử dụng thuốc xịt mũi corticosteroid. Dùng thuốc kháng histamin. Rửa khoang mũi.