Dextromethorphan Hydrobromide and Chlorpheniramine Maleate Syrup


A dry cough means it’s tickly and doesn’t produce any phlegm (thick mucus). Because there is not mucus blocking the lungs or airways hence nothing comes out when you cough. This lack of mucus makes it an unproductive cough. Cough suppressants (antitussives) quiet your cough by blocking your cough reflex. This helps in dry coughs that are painful or that keep you up at night. First generation antihistamines like chlorpheniramine are often used alone or in combination in the management of nonspecific cough.

Cofboj DX Syrup is a combination of Dextromethorphan and Chlorpheniramine Maleate is used for effective treatment of dry cough due to allergy. This product is intended to be used for relief of cough and upper respiratory symptoms, including nasal congestion associated with allergy or the common cold.

Mode of action

Dextromethorphan suppresses the cough reflex by a direct action on the cough center in the medulla of the brain. Dextromethorphan shows high affinity binding to several regions of the brain, including the medullary cough center.

Chlorpheniramine competes with histamine for the normal H1-receptor sites on effector cells of the gastrointestinal tract, blood vessels and respiratory tract.

Directions for use 

  • Children above 6 years 2.5 ml (1/2 teaspoonful) 4 times daily.
  • Children between 2-6 years 1.25 ml (1/4 teaspoonful) 4 times daily
  • Adults 5 ml (1 teaspoonful) 4 times daily or as directed by the Physician 


  • Dry Allergic Cough
  • Smokers Cough
  • Whooping Cough

Side effects 

The most common side effect is drowsiness. This drowsiness can be helpful if other symptoms are particularly troublesome at night.

The following side effects may occur. If you get any of the following side effects, stop taking this medicine and see your doctor.

  • Loss of appetite, indigestion, feeling or being sick, diarrhoea, tummy pain or dry mouth
  • Low blood pressure or changes in heart rhythm
  • Chest tightness or thickening of phlegm
  • Confusion, excitability, irritability, low mood or nightmares
  • Children may become excited.
  • Skin rash
  • Feeling sick, being sick, headache
  • Fast or irregular heartbeat, high blood pressure

Storage and safety information 

  • Keep this medicine out of the sight and reach of children.
  • Pregnancy: Not established study for this combination hence this combination should be administered with caution in pregnancy.
  • Lactation: Since many drugs are excreted in human milk and because of the potential for serious side effects in nursing infants.