Well at Walgreens Wal-Tussin CF Max, MAXIMUM STRENGTH ADULT NON-DROWSY, Multi-Symptom Cold, (dextromethorphan HBr 10 mg, guaifenesin 200 mg, phenylephrine HCI 5 mg), 8 FL OZ (237 mL) bottles, Distributed by: Walgreen Co, Deerfield, IL 60015 ---- NDC 0363-0229-08
Presence of Precipitate; white substance confirmed as Guaifenesin, an active ingredient was observed in some bottles. If the product is shaken or warmed the white particles goes into the solution.
Nationwide
https://www.accessdata.fda.gov/scripts/ires/index.cfm?Product=D-185-2013