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Extendryl GCP is a combination pharmaceutical product containing carbetapentane (also known as pentoxyverine), guaifenesin, and phenylephrine. It is indicated for the symptomatic relief of cough, nasal congestion, and chest congestion associated with the common cold, sinusitis, or upper respiratory allergies. Carbetapentane acts as a non-opioid antitussive by suppressing the cough reflex in the brain, primarily through sigma-1 receptor agonism and muscarinic antagonism. Guaifenesin is an expectorant that increases the volume and reduces the viscosity of secretions in the trachea and bronchi, facilitating their removal. Phenylephrine is a sympathomimetic amine that acts as a decongestant by stimulating alpha-1 adrenergic receptors, leading to vasoconstriction in the nasal mucosa. The product has been available in various oral forms, including extended-release tablets and liquids.
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