Zephrex-La Oral

The guaifenesin in this product can affect the results of certain lab tests (e.g., uric acid levels, 5-hydroxyindoleacetic acid levels, vanillylmandelic acid levels), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this drug.

This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.

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