The Guaifenesin is an expectorant drug having the property of reducing or destroying mucus abnormal produced in the bronchi, directly attacking the structure of secretions, causing the decrease thereof and reducing the viscosity of mucus for easier expulsion of the organism.

Basically its main function is to help decongest the chest in the patient, however, it relieves the symptoms but does not attack the cause or the reason that is producing the congestion. It also helps to clear the airways by eliminating excess mucus so that breathing will be done much more effectively and with less difficulty.

In the following article we will show you the benefits that the use of this ancient drug provides to the body, its side effects and contraindications, as well as the presentations that are currently available on the market and some curiosities that this characteristic drug involves.

Uses of Guaifenesin

Its use is recommended to relieve congestion in the chest or respiratory tract as we mentioned earlier, the drug relieves the symptoms but does not attack the cause of the discomfort nor does it accelerate the recovery of the patient. It is indicated for respiratory conditions that are accompanied by abnormal mucus and cough, mild infections of the upper respiratory tract such as:

How this medicine should be given

Depending on its presentation in tablets, prolonged-release tablets, capsules, granules or liquid syrup to be administered orally, it can be consumed with some food, normally the syrup, pills, capsules and granules are ingested once every 4 hours according to be necessary; In the case of prolonged-release tablets, one dose every 12 hours is usually indicated.

The indications and recommended doses are usually different for adults, children and the elderly, so only a medical specialist is in the power to indicate its intake. Never exceed or decrease the recommended dose and do not reduce the times between each intake.

Never mix its use with other medications that are usually bought without a prescription or prescription, so it is frequently used in various antihistamines and you could overdose due to its active ingredients.

Combination and non-prescription products indicated for coughs and colds have a high risk of producing side effects in children under 6 years of age, they can even cause death in younger infants, so always consult with a specialist before giving or ingesting a dose.

If your recipe is in soluble granules be sure to pour the entire contents of the sachet into your mouth and swallow it completely.

Always use the measure or measuring spoon if you are taking the liquid presentation or any other element that serves for this purpose, never use a kitchen spoon to replace the measuring cup.

If you are giving the medicine to a child older than 6 years do not exceed the dose prescribed by your doctor and always make sure it is the presentation for children.

In case you forget to give a dose, you can take it as soon as you remember, if according to the schedule you are already close to your next dose, wait for it and never take two doses in a row to replace the forgotten one.

A special diet is necessary while using this medicine.

It is advisable to drink large amounts of liquid while the medication is being administered and unless the specialist makes a special request, you can continue with your usual diet.

History to be disclosed to your doctor before use

  • If you are a smoker.
  • If you have suffered from chronic bronchitis.
  • Emphysema.
  • If you have a fever.
  • Asthma attacks
  • If you are breastfeeding a baby.
  • If you are pregnant or are in any medical treatment to stay in condition.
  • Heart problems.
  • Diabetic people.

Side effects

Contact your doctor immediately if you experience any of the following side symptoms, if you are taking this drug:

  • Headache.
  • Dizziness.
  • Sickness.
  • Tachycardia.
  • Dry mouth
  • Allergic skin reaction.
  • Swelling in the part of the face, lips or tongue.
  • Difficulty breathing.
  • Stomach ache.


It has been determined that, like any other drug, this drug should not be given for the following cases:

  • If you suffer from severe high blood pressure.
  • People with a history of allergy to the main compound or active ingredient of this medicine.
  • Heart failure.
  • Severe hyperthyroidism
  • In diabetic people it should always be administered under medical supervision.
  • If you suffer from known pathologies such as:
    • Chronic gastritis.
    • Digestive bleeding or ulcers.
    • Inflammatory bowel disease
  • Angina pectoris.
  • Glaucoma.
  • Bronchial asthma.
  • In pregnant women or if you are breastfeeding
  • Do not use in children under 6 years of age.


It has been determined that the metabolites of this remedy intervene in the modification of the values ​​in the urine, falsely increasing the same, that is why the drug must be suspended 48 hours before carrying out a collection or urine sample when some type is going to be carried out. study.

Interactions with other medications

The effects produced by a drug can change if they are taken at the same time with other medicines, so the risks of producing side effects in a patient can be increased or simply cause the same to malfunction. Be sure to inform your specialist doctor of a list of the medications that you frequently take and never arbitrarily mix your medication with another.

Presentations available in the market

  • Box with 60 or 120 ml bottle plus measuring spoon.
  • Box with 30 ml bottle and dropper.
  • Box of pills of 100, 200 and 400 mg in tablets.
  • 100 mg granules.

In many countries it is essential to present the medical prescription to make your purchase.

How to store this medicine

Always keep the product in its original presentation, make sure to close the bottle properly after use and always keep it out of the reach of children.

Store at room temperature and do not expose the product to sunlight, heat or humidity.

Symptoms caused by an overdose or accidental ingestion.

  • Difficulty breathing.
  • Drop in blood pressure
  • Intestinal contractions
  • Severe diarrhea
  • Central nervous system depression, producing:
    • Drowsiness.
    • Low heart rate
    • Slow breathing
    • Loss of motor skills.
    • Speech diminished and unclear.
    • It affects the individual’s thinking and reaction to a common situation (drunkenness symptoms).
    • Unclear or blurred vision.

In the event of accidental ingestion, immediately locate your doctor and go to the nearest health center that you have around you, call 911 or the local emergency number.

Trademarks available in the market.

Organ-I NR, Organidin NR, Scot-Tussin, Siltussin SA, Hytuss, Guiacough, Guiatuss, Halotussin, Bidex, Diabetic Tussin, Guaifen NR, Mallotuss, Mastussin, Tussin, Iophen NR, Lotus, Robitussin, Miltuss EX, Mucinex, Mytussin , Ganidin NR, Glytuss, Guaiatussin, Humibid E, Phanasin, Q-Tussin, Ri-Tussin, entre otras.

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Dr. Samantha Robson ( CRN: 0510146-5) is a nutritionist and website content reviewer related to her area of ​​expertise. With a postgraduate degree in Nutrition from The University of Arizona, she is a specialist in Sports Nutrition from Oxford University and is also a member of the International Society of Sports Nutrition.

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