If this occurs reduce your dosage or stop taking the drug. Important Note Only take decongestants and antihistamines under advisement by your health care provider if you have high blood pressure, heart disease, diabetes, glaucoma or thyroid disease. These drugs may worsen your condition. Use a cough suppressant if you have a dry cough. Use an expectorant if your cough is bringing up mucous or phlegm.
Some cough medicines contain mixtures of expectorants and antitussives.
Ask your pharmacists which medication is best for you.