Instaryl-P Syrup is a combination of four medicines. It is used in the treatment of cough. It relaxes the muscles in the airways and widens the airways. At the same time, it thins and loosens the mucus, making it easier for you to cough out. This makes breathing easier and relieves your symptoms. Instaryl-P Syrup may be taken with or without food. The dose and duration will depend on your condition and how you respond to the medicine. Try to take it at the same time each day. It’s important to keep taking this medicine until your doctor tells you not to. Use this medicine regularly to get the most benefit from it even if you feel well. Using this medicine may cause some common side effects such as increased heart rate, palpitations, nausea, shortness of breath, vomiting, and abdominal distension. These side effects aren't often dangerous and they should gradually improve as your body gets used to this medicine. There are other, rarer, side effects and you should call your doctor straight away if you get chest pain, a very bad headache, or very bad dizziness. Before using Instaryl-P Syrupl, you should tell your doctor if you have any medical conditions. Let your doctor also know about all the other medicines you are taking. It is important to ask your doctor about the safety of this medicine if you are pregnant or breastfeeding. And you shouldn’t smoke. Smoking causes damage to your lungs and will make your condition worse.