what is the effect believed to be required in mixing the phenylpropanolamine with isopropamide (anticholinergic drug) in some drugs used in symptomatic treatment of common cold?
Phenylpropanolamine is a decongestant. It works by constricting (shrinking) blood vessels (veins and arteries) in your body. Constriction of blood vessels in your sinuses, nose, and chest allows drainage of those areas, which decreases congestion.
Isopropamide is an antimuscarinic. It is mainly used in the treatment of peptic ulcers and other gastrointestinal disorders.
It is not commonly used in common cold preparations
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