Your doctor will tell you how much of this medicine to use and how often. Your dose may need to be changed several times in order to find out what works best for you. Do not use more medicine or use it more often than your doctor tells you to. Most people need to wait at least one week between dose changes.
You may take this medicine with or without food.
Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.
For the liquid form: This medicine comes with patient instructions. Read and follow these instructions carefully. Ask your doctor or pharmacist if you have any questions.
If a dose is missed:
If you miss a dose or forget to use your medicine, use it as soon as you can. If it is almost time for your next dose, wait until then to use the medicine and skip the missed dose. Do not use extra medicine to make up for a missed dose.
Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.
Make sure your doctor knows if you are also using amantadine (Symmetrel®), ketamine (Ketalar®), cimetidine (Tagamet®), ranitidine (Zantac®), or quinidine (Cardioquin®, Quinaglute®, Quinidex®).
Your doctor needs to know if you are using a diuretic or "water pill," such as acetazolamide, hydrochlorothiazide (HCTZ), methazolamide, triamterene, Diamox®, Dyazide®, Dyrenium®, Maxzide®, Neptazane®. Make sure your doctor knows if you are also using an antacid or laxative that contains sodium bicarbonate, such as Alka-Seltzer®. Sodium bicarbonate is the same thing as baking soda or bicarbonate of soda.
Talk to your doctor before using a cold or cough medicine that contains dextromethorphan. Some brand names are DayQuil®, NyQuil®, Robitussin® DM, or TheraFlu®.
Tell your doctor if you smoke or if you are using a stop-smoking aid that contains nicotine (such as Nicoderm®, Nicotrol®, or Nicorette®).