Expectuss Liquid

Carbetapentane citrate is a centrally acting non-narcotic antitussive.

Guaifenesin is an expectorant. Its action increases the output of respiratory tract fluid by reducing
adhesiveness and surface tension. Sinus and bronchial drainage is improved and dry, nonproductive
coughs become more productive and less frequent.

Guaifenesin may produce an increase in urinary 5-hydroxy-indoleacetic acid and may therefore interfere
with the interpretation of this test for the diagnosis of carcinoid syndrome. It may also falsely elevate the
 VMA test for catechols. Administration of this drug should be discontinued 48 hours prior to the collection
of urine specimens for such tests.