Get guaifenesin (generic Mucinex) online prescriptions for congestion

Guaifenesin is a common medication used for chest congestion. Talk to a provider to discuss whether guaifenesin is right for you.

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Product Overview

Guaifenesin (generic Mucinex)

  • What is guaifenesin (generic Mucinex)
    Guaifenesin is an expectorant used to help relieve chest congestion. This medication will not treat or cure the underlying condition causing chest congestion, but it does help minimize discomfort.

    Some strengths of guaifenesin are available over the counter, meaning they can be purchased without a prescription. Other strengths, or certain formulations containing guaifenesin, require a written prescription from a licensed healthcare provider. Guaifenesin is available in generic form as guaifenesin or under various brand names such as Mucinex or Robitussin.

  • What are the common side effects of guaifenesin (generic Mucinex)?
    Guaifenesin has been shown to cause mild side effects. Talk to a healthcare provider if these adverse reactions become severe or do not go away after a few days.

    Common side effects include headache, nausea, and dizziness.

    This is not a complete list of side effects. If you are concerned about additional side effects, please contact your provider directly.

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Frequently asked questions about guaifenesin

Medically reviewed by:
Jessica Swirble, PharmD

Guaifenesin is an expectorant used to help relieve chest congestion. Chest congestion is a common symptom of many illnesses. Guaifenesin loosens up mucus in the chest and lungs to ease this symptom. This medication will not treat or cure the underlying condition causing chest congestion, but it does help minimize discomfort.

Some strengths of guaifenesin are available over the counter, meaning they can be purchased without a prescription. Other strengths, or certain formulations containing guaifenesin, require a written prescription from a licensed healthcare provider. Guaifenesin is available in generic form as guaifenesin or under various brand names such as Mucinex or Robitussin. It’s important to note that these medicines may contain other drugs. Be sure to read the packaging of your medication so you are aware of its active ingredients.

Guaifenesin treats chest congestion. Chest congestion, also known as a “chest cold,” is a common symptom caused by various respiratory illnesses.

Common causes of chest congestion include:

  • The common cold (upper respiratory infection)
  • Chronic obstructive pulmonary disease (COPD)
  • Acute bronchitis
  • Pneumonia
  • Influenza (the flu)
  • Asthma

Chest congestion is a mucus build-up in the lungs and lower respiratory tract (the bronchi). This accumulation of mucus and phlegm leads to a productive cough, a wet cough that brings up mucus from the airways, chest pressure, and wheezing.

Other symptoms may accompany chest congestion. These include:

  • Fever
  • Chills
  • Stuffy or runny nose
  • Body aches
  • Coughing
  • Chest tightness or pressure
  • Headache

Guaifenesin is specifically used to break down mucus in the airways to relieve chest congestion. It will not treat or cure any underlying condition causing the symptom, nor will it treat symptoms such as a stuffy nose, fever, or headaches.

Guaifenesin is classified as an expectorant. Expectorant medications promote the clearance of mucus and phlegm from the respiratory tract, primarily the lungs and airways. These medications function by increasing the volume and reducing the thickness of the mucus, making it easier to expel. They achieve this by stimulating the production of respiratory tract secretions, which help to moisturize and loosen the mucus. As a result, the body can effectively remove excess mucus through coughing, relieving congestion and facilitating easier breathing for individuals with respiratory conditions such as bronchitis, coughs, and chest congestion.

Expectorants like guaifenesin specifically target congestion symptoms. They should not be used to treat concurrent symptoms like fever, headaches, or body aches.

Guaifenesin has been shown to cause mild side effects. Talk to a healthcare provider if these adverse reactions become severe or do not go away after a few days.

Mild side effects reported from guaifenesin use include:

  • Headache
  • Nausea
  • Dizziness
  • Vomiting

More severe side effects include:

  • Difficulty breathing
  • Skin rash
  • Hives
  • Stomach pain

Seek medical attention immediately if you notice any of these symptoms. These are signs of a severe adverse reaction requiring medical treatment.

As with all medications, inform your doctor of any medical conditions you currently manage before taking this drug. Tell them about any and all medications, prescription drugs, and supplements you are taking before starting treatment with guaifenesin. This medication can interact with other substances, causing potentially severe adverse reactions.

In addition, let your doctor know if you smoke before taking guaifenesin.

Finally, let your doctor know if you are pregnant or plan on becoming pregnant before starting treatment with guaifenesin. If you become pregnant while taking this medication, inform your healthcare provider right away.

Guaifenesin is commonly supplied as an oral tablet, capsule, solution, or syrup. Take this medication with water and drink plenty of water while taking guaifenesin to help clear up mucus. Do not crush or chew guaifenesin tablets or capsules.

The recommended dosage varies depending on the patient’s age, body weight, and condition. Take this medication exactly as ordered. Do not increase or discontinue the dosage without consulting your healthcare provider first.

Keep all medication bottles out of reach of small children and at room temperature. Avoid exposing the medication to excess heat or moisture. Do not freeze this medication.

If you notice any adverse side effects, notify your healthcare provider immediately.

If you miss a dose of guaifenesin, take it as soon as possible. If it’s nearly time for your next dose, skip the missed dose and take your regularly scheduled amount. Do not take a double dose of guaifenesin.

Guaifenesin is widely available over-the-counter. That means that this medication can be purchased without a prescription. Guaifenesin and its brand-name forms can be found at most convenience stores, grocery stores, and pharmacies.

Guaifenesin can cause adverse side effects when combined with other medications or supplements. Talk to a healthcare provider before taking guaifenesin if you are taking any prescription medications or supplements or are managing an ongoing health concern.

Guaifenesin can be purchased without a prescription, so you can get it at most stores where OTC medicines are sold. This includes grocery stores, convenience stores, gas stations, and pharmacies. Guaifenesin can also be purchased online for delivery.

Looking for more information? Book an online doctor visit to talk to a healthcare provider about whether guaifenesin is right for you.

Guaifenesin is a generic drug. It’s available in its generic form or under brand names like:

  • Tussin
  • Guiatuss
  • Mucinex
  • Robitussin Chest Congestion
  • Vicks Dayquil
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