Mexacof Syrup is used to treat cough associated with mucus. It works by increasing the volume of fluid in the airways, reducing the stickiness of mucus and helping to remove it from the airways. Also, it relaxes muscles and widens the airways. Thereby, it makes breathing easier. It thins and loosens phlegm (mucus) in the lungs, windpipe and nose. Thus, it helps cough up easily. Some people may experience side effects such as nausea, vomiting, drowsiness, headache, dizziness, skin rash, tremor, stomach upset and fast heartbeats. Before taking this medicine, you should tell your doctor if you are allergic to any of its components or if you are pregnant/breastfeeding, and about all the medications you are taking and pre-existing medical conditions.