 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  are at higher risk for serious (even fatal) side effects, especially breathing problems. Talk with the doctor about the risks and benefits of this medication.Cough-and-cold products do not cure colds. Cough due to a common cold often does not need to be treated with medicine. Ask your doctor or pharmacist about other ways to relieve cough and cold symptoms, such as drinking enough fluids, using a humidifier, or saline nose drops/spray. How to use Guaiatussin AC Take this medication by mouth with or without food as directed by your doctor, usually every 4 to 6 hours as needed with a full glass of water (8 ounces or 240 milliliters). This medication can be taken with food if stomach upset occurs. Drink plenty of fluids while you are using this medication unless otherwise directed by your doctor. The fluid will help loosen the mucus in your lungs. If you are using the liquid form of this medication, carefully measure the dose using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose. Some liquids need to be shaken before pouring each dose. Check your bottle or ask your pharmacist if your product needs to be shaken. Do not increase your dose or use </s>