A similarly marked capsule "WL 89 SU PE" is a preparation of "Sudafed PE" (although possibly not marked under the Sudafed brand name). Its contents are as follows:
Acetaminophen 325 mg, Dextromethorphan HBr 10 mg, Guaifenesin 100 mg, Phenylephrine HCl 5 mg
The SU PE in common would likely mean it is a similar preparation of cold medication. I wouldn't advise taking it unless you get a proper ID.
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