If the tablet was white then it could have been Bidex 400 (guafenesin 400mg).
Uses For Bidex 400
Guaifenesin is used to help clear mucus or phlegm (pronounced flem) from the chest when you have congestion from a cold or flu. It works by thinning the mucus or phlegm in the lungs.
This medicine is available both over-the-counter (OTC) and with your doctor's prescription.
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