pronounced as(gwye fen' e sin)


FDA Intends to Remove Some Unapproved Cough, Cold, and Allergy Drugs from the Market

This safety alert does not apply to this medication, but only to some products which contain this medication. In addition, it is important that you know that there is not a problem with most of the products described in this medication monograph. And some drug companies may decide to seek full approval from the FDA so that they can continue marketing their products.

On March 2, 2011, the Food and Drug Administration (FDA) issued a safety alert about certain unapproved prescription cough, cold, and allergy products containing this drug in combination with other drugs. These products are not currently approved by the FDA for safety, effectiveness, and quality. FDA asked drug companies to stop shipping most of these products for sale in the US within the next 6 months. Although some of these products have been marketed for many years, laws about what a company must prove to FDA for drug product approval have gotten tougher and increased enforcement of these laws is now taking place. The FDA took this action due to concerns about certain potential risks associated with use of these medications. These risks may include:

  • the possibility of improper use in infants and young children

  • potentially risky combinations of ingredients

  • patients receiving too much or too little of the medication because of problems with the way some ''timed-release'' products are made

If you are concerned that the prescription cough, cold, and allergy medication you are taking is not approved by the FDA, you should talk to your doctor or pharmacist. If the medication you are taking is not approved, your doctor can prescribe another prescription medication or your doctor or pharmacist can suggest an over-the-counter (OTC) cough, cold, and allergy product for your condition. There are many safe and effective alternative approved products that can be taken instead. Your doctor probably prescribed the medicine without knowing that FDA had not approved it. This is because it has been so difficult for doctors and pharmacists to find out that these products are unapproved. For additional information:

Why is this medication prescribed?

Guaifenesin is used to relieve chest congestion . Guaifenesin may help control symptoms but does not treat the cause of symptoms or speed recovery. Guaifenesin is in a class of medications called expectorants. It works by thinning the mucus in the air passages to make it easier to cough up the mucus and clear the airways.

How should this medicine be used?

Guaifenesin comes as a tablet, a capsule, an extended-release (long-acting) tablet, dissolving granules, and a syrup (liquid) to take by mouth. The tablets, capsules, dissolving granules, and syrup are usually taken with or without food every 4 hours as needed. The extended-release tablet is usually taken with or without food every 12 hours. Follow the directions on the package or on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take guaifenesin exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.

Guaifenesin comes alone and in combination with antihistamines, cough suppressants, and decongestants. Ask your doctor or pharmacist for advice on which product is best for your symptoms. Check nonprescription cough and cold product labels carefully before using two or more products at the same time. These products may contain the same active ingredient(s) and taking them together could cause you to receive an overdose. This is especially important if you will be giving cough and cold medications to a child.

Nonprescription cough and cold combination products, including products that contain guaifenesin, can cause serious side effects or death in young children. Do not give these products to children younger than 4 years of age. If you give these products to children 4 to 11 years of age, use caution and follow the package directions carefully.

If you are giving guaifenesin or a combination product that contains guaifenesin to a child, read the package label carefully to be sure that it is the right product for a child of that age. Do not give guaifenesin products that are made for adults to children.

Before you give a guaifenesin product to a child, check the package label to find out how much medication the child should receive. Give the dose that matches the child's age on the chart. Ask the child's doctor if you don't know how much medication to give the child.

If you are taking the liquid, do not use a household spoon to measure your dose. Use the measuring spoon or cup that came with the medication or use a spoon made especially for measuring medication.

Swallow the extended-release tablets whole with a full glass of water. Do not break, crush, or chew them.

If you are taking the dissolving granules, empty the entire contents of the packet onto your tongue and swallow.

If your symptoms do not improve within 7 days or if you also have a high fever, a rash, or a headache that does not go away, call your doctor.

Other uses for this medicine

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This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

What special precautions should I follow?

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Before taking guaifenesin,

  • tell your doctor and pharmacist if you are allergic to guaifenesin, any other medications, or any of the ingredients in the guaifenesin product you plan to take. Check the package label for a list of the ingredients.
  • tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take.
  • tell your doctor if you smoke and if you have or have ever had a cough that occurs with a large amount of phlegm (mucus) or if you have or have ever had a breathing problem such as asthma, emphysema, or chronic bronchitis. If you will be taking the dissolving granules, tell your doctor if you are on a low magnesium diet or if you have kidney disease.
  • tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking guaifenesin, call your doctor.
  • if you have phenylketonuria (PKU, a inherited condition in which a special diet must be followed to prevent mental retardation), you should know that the dissolving granules may be sweetened with aspartame, a source of phenylalanine.

What special dietary instructions should I follow?

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Drink plenty of fluids while you are taking this medication.

Unless your doctor tells you otherwise, continue your normal diet.

What should I do if I forget a dose?

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Guaifenesin is usually taken as needed. If your doctor has told you to take guaifenesin regularly, take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.

What side effects can this medication cause?

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Guaifenesin may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

  • headache

  • nausea

  • vomiting

Guaifenesin may cause other side effects. Call your doctor if you have any unusual problems while you are taking this medication.

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online [at] or by phone [1-800-332-1088].

What storage conditions are needed for this medicine?

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Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom). Throw away any medication that is outdated or no longer needed. Talk to your pharmacist about the proper disposal of your medication.

In case of emergency/overdose

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In case of overdose, call your local poison control center at 1-800-222-1222. If the victim has collapsed or is not breathing, call local emergency services at 911.

What other information should I know?

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Ask your pharmacist any questions you have about guaifenesin.

It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.

Brand names

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  • Bidex®
  • Diabetic Tussin®
  • Ganidin NR®§
  • Glytuss®
  • Guaiatussin®
  • Guaifen NR®
  • Guiacough®
  • Guiatuss®
  • Halotussin®
  • Humibid E®§
  • Hytuss®
  • Iophen NR®
  • Lotussin®
  • Mallotuss®
  • Mastussin®
  • Miltuss EX®
  • Mucinex®
  • Mytussin®
  • Organ-I NR®§
  • Organidin NR®§
  • Phanasin®
  • Q-Tussin®
  • Ri-Tussin®
  • Robitussin®
  • Scot-Tussin®
  • Siltussin SA®
  • Tussin®

Brand names of combination products

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  • AccuHist DM® (containing Brompheniramine, Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Aldex GS® (containing Guaifenesin, Pseudoephedrine)
  • Aldex GS DM® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)
  • Alka-Seltzer Plus Mucus and Congestion® (containing Dextromethorphan, Guaifenesin)
  • Allfen DM® (containing Dextromethorphan, Guaifenesin)§
  • Ambifed® (containing Guaifenesin, Pseudoephedrine)§
  • Ambifed DM® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Aquatab C® (containing Carbetapentane, Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Aquatab DM® (containing Dextromethorphan, Guaifenesin)§
  • Betavent® (containing Carbetapentane, Guaifenesin)
  • Biotuss® (containing Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Bitex® (containing Codeine, Guaifenesin)
  • BP 8® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Bromhist DM® (containing Brompheniramine, Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Bromhist PDX® (containing Brompheniramine, Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Broncholate® (containing Ephedrine, Guaifenesin)
  • Broncopectol® (containing Chlorpheniramine, Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Brondil® (containing Dyphylline, Guaifenesin)
  • Bronkaid® (containing Ephedrine, Guaifenesin)
  • Bronkotuss® (containing Chlorpheniramine, Ephedrine, Guaifenesin)
  • Brontex® (containing Codeine, Guaifenesin)
  • Brontuss® (containing Dextromethorphan, Guaifenesin)§
  • Brontuss DX® (containing Dextromethorphan, Guaifenesin, Phenylephrine)
  • Brontuss SF® (containing Dextromethorphan, Guaifenesin, Phenylephrine)
  • Certuss® (containing Chlophedianol, Guaifenesin)
  • Certuss Multilayer® (containing Carbetapentane, Guaifenesin)§
  • Certuss-D® (containing Chlophedianol, Guaifenesin, Pseudoephedrine)
  • Cheracol D® (containing Dextromethorphan, Guaifenesin)
  • Cheracol with Codeine® (containing Codeine, Guaifenesin)
  • Cheratussin® (containing Codeine, Guaifenesin)
  • Children's Mucinex Chest Congestion® (containing Guaifenesin)
  • Children's Mucinex Cough® (containing Dextromethorphan, Guaifenesin)
  • Children's Mucinex Multi-Symptom Cold® (containing Dextromethorphan, Guaifenesin, Phenylephrine)
  • Chlordex GP® (containing Chlorpheniramine, Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Codafen® (containing Codeine, Guaifenesin)
  • Codiclear DH® (containing Guaifenesin, Hydrocodone)
  • Coldmist DM® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Coldmist LA® (containing Guaifenesin, Pseudoephedrine)§
  • Comtrex Deep Chest Cold Non Drowsy® (containing Acetaminophen, Guaifenesin)
  • Coricidin HBP Chest Congestion and Cough® (containing Dextromethorphan, Guaifenesin)
  • Coricidin HBP Day and Night Multi-Symptom Cold® (containing Acetaminophen, Chlorpheniramine, Dextromethorphan, Guaifenesin)
  • Decon E® (containing Guaifenesin, Phenylephrine)§
  • Decon G® (containing Brompheniramine, Guaifenesin, Phenylephrine)§
  • Deconex® (containing Guaifenesin, Phenylephrine)
  • Defen LA® (containing Guaifenesin, Pseudoephedrine)§
  • Despec® (containing Guaifenesin, Phenylephrine)
  • Despec NR® (containing Dextromethorphan, Guaifenesin, Phenylephrine)
  • Diabetic Tussin DM® (containing Dextromethorphan, Guaifenesin)
  • Difil-G® (containing Dyphylline, Guaifenesin)
  • Dilex-G® (containing Dyphylline, Guaifenesin)§
  • Donatuss DC® (containing Dihydrocodeine, Guaifenesin, Phenylephrine)§
  • Donatussin® (containing Guaifenesin, Phenylephrine)
  • Drituss DM® (containing Dextromethorphan, Guaifenesin)§
  • Duratuss DM® (containing Dextromethorphan, Guaifenesin)
  • Dyfilin GG® (containing Dyphylline, Guaifenesin)
  • Dyflex-G® (containing Dyphylline, Guaifenesin)
  • Dynatuss EX® (containing Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Dyphylline GG® (containing Dyphylline, Guaifenesin)§
  • Dyphysin® (containing Dyphylline, Guaifenesin)
  • Endacof XP® (containing Guaifenesin, Hydrocodone)
  • Endacon DM® (containing Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Entex LA® (containing Guaifenesin, Phenylephrine)§
  • Entex LQ® (containing Guaifenesin, Phenylephrine)
  • Entex PSE® (containing Guaifenesin, Pseudoephedrine)§
  • Entuss® (containing Guaifenesin, Hydrocodone)
  • Exall D® (containing Carbetapentane, Guaifenesin, Pseudoephedrine)§
  • ExeClear-C® (containing Codeine, Guaifenesin)§
  • Execof® (containing Dextromethorphan, Guaifenesin, Phenylephrine)§
  • ExeFen DMX® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)
  • ExeFen IR® (containing Guaifenesin, Pseudoephedrine)
  • Expectuss® (containing Carbetapentane, Guaifenesin)§
  • Fenesin DM® (containing Dextromethorphan, Guaifenesin)§
  • Ganituss DM NR® (containing Dextromethorphan, Guaifenesin)§
  • Genetuss 2® (containing Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Gentex LQ® (containing Carbetapentane, Guaifenesin, Phenylephrine)§
  • Giltuss® (containing Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Glycotuss-DM® (containing Dextromethorphan, Guaifenesin)
  • Guaidex TR® (containing Chlorpheniramine, Dextromethorphan, Guaifenesin, Methscopolamine, Pseudoephedrine)§
  • Guaifen DM® (containing Dextromethorphan, Guaifenesin)
  • Guiadrine DX® (containing Dextromethorphan, Guaifenesin)§
  • Guiatex PE® (containing Guaifenesin, Phenylephrine)§
  • Guiatuss DM® (containing Dextromethorphan, Guaifenesin)
  • Guiatussin DM® (containing Dextromethorphan, Guaifenesin)
  • Halotussin DM® (containing Dextromethorphan, Guaifenesin)
  • Histacol DM® (containing Brompheniramine, Guaifenesin, Dexchlorpheniramine, Pseudoephedrine)§
  • HT-Tuss DM® (containing Dextromethorphan, Guaifenesin)§
  • Humibid CS® (containing Dextromethorphan, Guaifenesin)§
  • Humibid DM® (containing Dextromethorphan, Guaifenesin)§
  • Hycotuss® (containing Guaifenesin, Hydrocodone)
  • Iophen C-NR® (containing Codeine, Guaifenesin)
  • Iophen DM-NR® (containing Dextromethorphan, Guaifenesin)
  • J-Max® (containing Guaifenesin, Phenylephrine)
  • Kwelcof® (containing Guaifenesin, Hydrocodone)
  • Lartus® (containing Dextromethorphan, Guaifenesin, Phelyephrine)§
  • Levall® (containing Carbetapentane, Guaifenesin, Phenylephrine)§
  • Liquibid D-R® (containing Guaifenesin, Phenylephrine)
  • Liquibid PD-R® (containing Guaifenesin, Phenylephrine)
  • Lortuss EX® (containing Codeine, Guaifenesin, Pseudoephedrine)
  • Lotussin DM® (containing Dextromethorphan, Guaifenesin)
  • Lufyllin-GG® (containing Dyphylline, Guaifenesin)§
  • Lusonex® (containing Guaifenesin, Phenylephrine)§
  • Maxiphen® (containing Guaifenesin, Phenylephrine)§
  • Maxi-Tuss DM® (containing Dextromethorphan, Guaifenesin)§
  • Medent DM® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Medent LD® (containing Guaifenesin, Pseudoephedrine)§
  • Montephen® (containing Guaifenesin, Phenylephrine)§
  • Mucinex Cough for Kids® (containing Dextromethorphan, Guaifenesin)
  • Mucinex D® (containing Guaifenesin, Pseudoephedrine)
  • Mucinex DM® (containing Dextromethorphan, Guaifenesin)
  • Muco Fen DM® (containing Dextromethorphan, Guaifenesin)§
  • Mudrane GG® (containing Aminophylline, Ephedrine, Guaifenesin, Phenobarbital)
  • Mytussin AC® (containing Codeine, Guaifenesin)
  • Mytussin DM® (containing Dextromethorphan, Guaifenesin)
  • Naldecon DX® (containing Dextromethorphan, Guaifenesin)
  • Nalex® (containing Guaifenesin, Pseudoephedrine)§
  • Nariz® (containing Guaifenesin, Phenylephrine)
  • Nasatab LA® (containing Guaifenesin, Pseudoephedrine)§
  • Nortuss EX® (containing Dextromethorphan, Guaifenesin)§
  • Numonyl DX® (containing Dextromethorphan, Guaifenesin, Phenylephrine)
  • Oratuss® (containing Carbetapentane, Guaifenesin, Phenylephrine)§
  • Panfil® (containing Dyphylline, Guaifenesin)
  • PediaCare Children's Cough and Congestion® (containing Dextromethorphan, Guaifenesin)
  • Pediahist DM® (containing Brompheniramine, Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Phencarb GG® (containing Carbetapentane, Guaifenesin, Phenylephrine)§
  • Phenydex® (containing Dextromethorphan, Guaifenesin, Pyrilamine)§
  • Poly Hist CB® (containing Carbetapentane, Guaifenesin)§
  • Poly-Tussin EX® (containing Dihydrocodeine, Guaifenesin, Phenylephrine)§
  • Polyvent® (containing Guaifenesin, Pseudoephedrine)§
  • Primatene® (containing Ephedrine, Guaifenesin)
  • Prolex DM® (containing Dextromethorphan, Guaifenesin)§
  • Prolex PD® (containing Guaifenesin, Phenylephrine)§
  • Pulmari GP® (containing Carbetapentane, Guaifenesin)§
  • Q-BID DM® (containing Dextromethorphan, Guaifenesin)§
  • Q-Tussin DM® (containing Dextromethorphan, Guaifenesin)
  • Quartuss® (containing Chlorpheniramine, Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Quibron® (containing Guaifenesin, Theophylline)
  • Quintex® (containing Guaifenesin, Phenylephrine)§
  • Respa 1st® (containing Guaifenesin, Pseudoephedrine)§
  • Respa DM® (containing Dextromethorphan, Guaifenesin)§
  • Respa PE® (containing Guaifenesin, Phenylephrine)§
  • Respaire® (containing Guaifenesin, Pseudoephedrine)§
  • Respi Tann G® (containing Carbetapentane, Guaifenesin)§
  • Robafen AC® (containing Guaifenesin, Codeine)
  • Robitussin Cough and Chest DM® (containing Dextromethorphan, Guaifenesin)
  • Robitussin Cough and Cold CF® (containing Dextromethorphan, Guaifenesin, Phenylephrine)
  • Ru-Tuss DM® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Scot-Tussin DM® (containing Chlorpheniramine, Dextromethorphan)
  • Scot-Tussin Senior® (containing Guaifenesin, Dextromethorphan)
  • Siltussin DM® (containing Dextromethorphan, Guaifenesin)
  • Simuc DM® (containing Dextromethorphan, Guaifenesin)§
  • Sine-Off Cough/Cold® (containing Acetaminophen, Dextromethorphan, Guaifenesin, Phenylephrine)
  • Sine-Off Severe Cold® (containing Acetaminophen, Guaifenesin, Phenylephrine)
  • Sinutuss DM® (containing Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Sinuvent PE® (containing Guaifenesin, Phenylephrine)§
  • Sitrex® (containing Guaifenesin, Phenylephrine)§
  • Sudafed PE Cold/Cough® (containing Acetaminophen, Dextromethorphan, Guaifenesin, Phenylephrine)
  • Sudafed PE Day/Night Cold® (containing Acetaminophen, Dextromethorphan, Diphenhydramine, Guaifenesin, Phenylephrine)
  • Sudafed PE Non-Drying Sinus® (containing Guaifenesin, Phenylephrine)
  • Sudafed PE Triple Action® (containing Acetaminophen, Guaifenesin, Phenylephrine)
  • Sudafed Triple Action® (containing Acetaminophen, Guaifenesin, Pseudoephedrine)
  • Sudatex DM® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Tenar DM® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Tenar PSE® (containing Guaifenesin, Pseudoephedrine)§
  • Theraflu Flu and Chest Congestion® (containing Acetaminophen, Guaifenesin)
  • Theraflu Max-D Severe Cold and Flu® (containing Acetaminophen, Dextromethorphan, Guaifenesin, Pseudoephedrine)
  • Touro CC® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Touro DM® (containing Dextromethorphan, Guaifenesin)§
  • Touro LA® (containing Guaifenesin, Pseudoephedrine)§
  • Triaminic Chest and Nasal Congestion® (containing Guaifenesin, Phenylephrine)
  • Trikof D® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Trispec DMX® (containing Dextromethorphan, Guaifenesin)§
  • Trispec PSE® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Trituss® (containing Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Tusnel® (containing Brompheniramine, Dextromethorphan, Guaifenesin)§
  • Tussafed EX® (containing Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Tussafed LA® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Tussbid® (containing Guaifenesin, Phenylephrine)§
  • Tussi Pres® (containing Dextromethorphan, Guaifenesin, Phenylephrine)
  • Tussidex® (containing Dextromethorphan, Guaifenesin, Phenylephrine)§
  • Tussin CF® (containing Dextromethorphan, Guaifenesin, Phenylephrine)
  • Tussin DM® (containing Dextromethorphan, Guaifenesin)
  • Tylenol Cold and Flu Severe® (containing Acetaminophen, Dextromethorphan, Guaifenesin, Phenylephrine)
  • Tylenol Cold Multi-Symptom Severe® (containing Acetaminophen, Dextromethorphan, Guaifenesin, Phenylephrine)
  • Tylenol Sinus Congestion and Pain Severe® (containing Acetaminophen, Guaifenesin, Phenylephrine)
  • Tylenol Sinus Severe Congestion Daytime® (containing Acetaminophen, Guaifenesin, Pseudoephedrine)
  • Vanacof DX® (containing Chlophedianol, Guaifenesin, Pseudoephedrine)
  • Vicks DayQuil Mucus Control® (containing Guaifenesin)
  • Vicks DayQuil Mucus Control DM® (containing Dextromethorphan, Guaifenesin)
  • Vicks Formula 44 Custom Care Chesty Cough® (containing Dextromethorphan, Guaifenesin)
  • Vicks VapoSyrup Severe Congestion® (containing Guaifenesin, Phenylephrine)
  • Visonex® (containing Guaifenesin, Phenylephrine)§
  • Wellbid D® (containing Guaifenesin, Phenylephrine)§
  • Z-Cof DM® (containing Dextromethorphan, Guaifenesin, Pseudoephedrine)§
  • Z-Cof LA® (containing Dextromethorphan, Guaifenesin)§
  • Z-Dex® (containing Dextromethorphan, Guaifenesin, Phenylephrine)
  • Zicam Multi-Symptom Cold and Flu Daytime® (containing Acetaminophen, Dextromethorphan, Guaifenesin)
  • Zodryl DEC® (containing Codeine, Guaifenesin, Pseudoephedrine)
  • Zotex® (containing Dextromethorphan, Guaifenesin, Phenylephrine)§

§ These products are not currently approved by the FDA for safety, effectiveness, and quality. Federal law generally requires that prescription drugs in the U.S. be shown to be both safe and effective prior to marketing. Please see the FDA website for more information on unapproved drugs ( and the approval process (

These branded products are no longer on the market and only generic alternatives are available.

Last Revised - 05/16/2012

AHFS® Consumer Medication Information. © Copyright, 2012. The American Society of Health-System Pharmacists, Inc., 7272 Wisconsin Avenue, Bethesda, Maryland. All Rights Reserved. Duplication for commercial use must be authorized by ASHP.