Nefdyl Syrup belongs to a group of medicines called expectorants and cough products used to provide relief from cough. Additionally, Nefdyl Syrup may also help in providing relief from allergy and nasal congestion due to cold. Coughing (dry or productive) is the body's way of clearing irritants (like allergens, mucus or smoke) from airways, thereby preventing respiratory infection. 
 
Nefdyl Syrup contains Ammonium chloride, Diphenhydramine hydrochloride, and Sodium citrate. Ammonium chloride helps remove phlegm/mucus from the airways by decreasing its stickiness. Diphenhydramine hydrochloride works by blocking the action of a chemical substance called histamine, which is responsible for causing allergic reactions. Sodium citrate helps in reducing congestion, thereby making it easier to cough out through the mouth. Together, Nefdyl Syrup provides relief from cough. 
 
You are advised to take Nefdyl Syrup for as long as your doctor has prescribed it for you, depending on your medical condition. In some cases, you may experience certain common side-effects such as headache, stomach upset, dizziness, tiredness, and dry mouth. Most of these side effects do not require medical attention and will resolve gradually over time. However, you are advised to talk to your doctor if the side effects persist or worsen.
 
Consult your doctor if you are pregnant or breastfeeding. Nefdyl Syrup may cause dizziness, so drive only if you are alert. Nefdyl Syrup should be given to children only if prescribed by the doctor. Avoid consuming alcohol with Nefdyl Syrup as it could lead to increased dizziness. Inform your doctor about all the prescription, non-prescription and herbal medicines you are taking to rule out any side effects/interactions.

Nefdyl Syrup is a combination of three drugs, namely: Ammonium chloride and Diphenhydramine hydrochloride, and Sodium citrate. Nefdyl Syrup is used to provide relief from a cough accompanied by cold symptoms such as sore throat, runny nose, watery eyes, and sneezing. Additionally, Nefdyl Syrup helps in providing relief from allergy. Ammonium chloride is an expectorant that helps remove phlegm/mucus from the airways by decreasing its stickiness. Diphenhydramine hydrochloride is an antihistamine that works by blocking the action of a chemical substance called histamine, which is responsible for causing allergic reactions. Sodium citrate is a mucolytic agent that helps in loosening the congestion, thereby making it easier to cough out through the mouth. Together, Nefdyl Syrup provides relief from cough.

Do not take Nefdyl Syrup if you are allergic to any of its contents. Inform your doctor if you have asthma, prostate problems, narrow-angle glaucoma, stomach or bowel ulcers, glucose-galactose malabsorption, sucrase-isomaltase deficiency, fructose intolerance, kidney or liver problems; if you are taking antidepressants or anti-Parkinson drugs or have taken them in the last 14days. Consult your doctor if you are pregnant, planning for pregnancy or breastfeeding. Nefdyl Syrup may cause dizziness, so drive only if you are alert. Avoid consuming alcohol with Nefdyl Syrup as it could lead to increased dizziness.