Active substance

Acetaminophen, Dextromethorphan Hydrobromide, Guaifenesin ,phenylephrine Hcl

4 products from 4 companies contain this in United States.

4 without prescriptionLiquid

Available without a prescription

Same substance is not the same product. Strength, form, release mechanism and other ingredients all differ. Whether one can replace another is a decision for a pharmacist.