Check the labels of all your medications to make sure you are not taking more than one product containing guaifenesin.

Check the ingredients and warnings on the medication label if you are concerned about phenylalanine.

It is important to look at the active ingredients found on any over-the-counter medication label to make sure you are not duplicating ingredients.

If you have phenylketonuria (PKU), check the medication label to see if the product contains phenylalanine.

In addition, always follow the instructions on the medication label.

Read medication labels before buying over-the-counter products.

Just be sure that the markings on the dosing device match the dose listed in the Drug Facts box on the medication label.

Read medication labels before buying over-the-counter preparations.

While some pharmacists may voluntarily provide expiration dates on medication labels, most do not because it is not required by law, though the American Pharmaceutical Association recommends such labeling.

Apply coal tar cream, lotion, ointment, or solution according the directions on the medication label.