Histacold-XT Suspension

Phenylephrine HCl

Drug Class: Sympathomimetic agent/ decongestant

• Phenylephrine is a direct-acting sympathomimetic amine that functions as an alpha-1 adrenergic agonist.
• Phenylephrine is a sympathomimetic primarily used as a systemic nasal decongestant. 

Alleviates blocked or stuffy nose:

• Responsible for the activation of postjunctional alpha-adrenergic receptors in the nasal mucosa by,
  • Distinct binding of the sympathomimetic agent to the binding site of the receptor, or 
  • By the enhanced release of norepinephrine leads to vasoconstriction.

Chlorpheniramine Maleate

Drug Class: Antihistamines

• Also known as chlorphenamine (CPM), is a potent alkylamine first-generation H1 antihistamine.
• One of the most often recommended and used 1st generation, antihistaminic agents. 

Anti-allergic and anti-inflammatory action of CPM: 

• It competitively binds to the H1 receptors of the vascular tunica medius in the nasal mucosa to prevent the histamine vasoreactive response. 

• Its antihistaminic action is translated to its anti-allergic & anti-inflammatory action in the nasal mucosa. 
• Its anti-cholinergic action is responsible for the decrease in nasal discharge, which is infective, hence it controls the symptoms of Allergic Rhinitis.