How long does it take for Mucinex DM to leave your system?

Take this medication by mouth with or without food, as directed by your doctor, usually every 12 hours with a full glass of water. If you are self-treating, follow all directions on the product package. If you have any questions, ask your doctor or pharmacist.

Dosage is based on your age, medical condition, and response to treatment. Do not take more than 2400 milligrams in 24 hours. Do not increase your dose or take this drug more often than directed.

Swallow the tablets whole. Do not crush or chew the tablets. Doing so can release all of the drug at once, increasing the risk of side effects.

Drink plenty of fluids while taking this medication. Fluids will help to break up mucus and clear congestion.

Tell your doctor if your condition returns, or if it is accompanied by a headache that doesn't go away, fever, severe sore throat, rash, or if it lasts or gets worse after 7 days. These may be signs of a serious medical problem. Seek immediate medical attention if you think you may have a serious medical problem.

Take this medication by mouth with or without food, as directed by your doctor, usually every 12 hours with a full glass of water. If you are self-treating, follow all directions on the product package. If you have any questions, ask your doctor or pharmacist.

Dosage is based on your age, medical condition, and response to treatment. Do not take more than 2 doses in 24 hours. Do not increase your dose or take this drug more often than directed.

Do not crush or chew this medication. Doing so can release all of the drug at once, increasing the risk of side effects. Also, do not split the tablets unless they have a score line and your doctor or pharmacist tells you to do so. Swallow the whole or split tablet without crushing or chewing.

Drink plenty of fluids while taking this medication. Fluids will help to break up mucus and clear congestion.

Improper use of this medication (abuse) may result in serious harm (such as brain damage, seizure, death). Do not increase your dose, take it more frequently, or use it for a longer time than directed.

Tell your doctor if your cough returns, or if it is accompanied by headache that doesn't go away, fever, severe sore throat, rash, or if it lasts or gets worse after 7 days. These may be signs of a serious medical problem. Get medical help right away if you think you may have a serious medical problem.

I have been diagnosed with COPD, bronchitis, asthma, allergies, chronic cough.... In this past 6 months I have had an allergic reaction to a bite of food that I was not aware of having every been allergic to. My husband had to do the Heimlich on me at home and twice in restaurants because of an extreme production of mucous that closed off my entire throat (mucous is not just produced by the sinuses). Sometimes I have had an increase in mucous, taken a Mucinex DM and had very quick response - quickly enough for me to remain seated and to complete my meal. Actually, I simply have an overactive immune system for anything that it interprets might be wrong for my body. Subsequently I tend to develop fluid in my lungs - and Mucinex DM has been the most efficient treatment with the least, if any, side affects. I met a woman at a store when I was purchasing some who said that it did nothing for her. I strongly recommend it!

The scene: You have chest congestion, so you cough and cough but still get no relief. Now, on top of the congestion, you also can’t stop coughing. You consider Mucinex DM because it’s made to treat both congestion and constant coughing. But before you use it, you want to know about the side effects.

Here’s a look at the active ingredients of this drug and the side effects they can cause. Keep reading to find out when the effects are most likely to happen, how to ease them, and what to do in the rare case that they’re severe.

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Mucinex DM is an over-the-counter medication. It comes in an oral tablet and an oral liquid. It has two active ingredients: guaifenesin and dextromethorphan.

Guaifenesin helps loosen mucus and thin the secretions in your lungs. This effect helps make your cough more productive by allowing you to cough up and get rid of bothersome mucus.

Dextromethorphan helps relieve the intensity of your cough. It also decreases your urge to cough. This ingredient is particularly helpful if you have trouble sleeping because of coughing.

Mucinex DM comes in two strengths. Regular Mucinex DM comes as an oral tablet only. Maximum Strength Mucinex DM is available as an oral tablet and oral liquid. Most people can tolerate both Mucinex DM and Maximum Strength Mucinex DM at the recommended dosage. Still, there are some side effects that can happen when you take either strength of this drug.

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Digestive system effects

Side effects of this drug can affect your digestive system. These effects are not common when you use the recommended dosage. However, if they do happen, they can include:

• nausea
• vomiting
• constipation

stomach pain

Nervous system effects

To help control your urge to cough, this drug works on receptors in your brain. In some people, this may also cause side effects. Side effects at the recommended dosage are uncommon but may include:

• dizziness
• drowsiness
• headache

These side effects are rare. If you have these side effects and they are severe or don’t go away, contact your doctor.

Skin effects

Side effects on your skin are uncommon at a normal dosage, but may include an allergic reaction. This reaction typically causes a rash on your skin. If you have a skin rash after using Mucinex DM, stop using the drug and contact your doctor.

If the rash gets worse or if you notice swelling of your tongue or lips, or have any difficulties breathing, call 911 or local emergency services immediately. These may be signs of a severe allergic reaction.

Side effects from overuse

Side effects of Mucinex DM are most likely to happen if you use too much of this drug. That’s why you should only use it as recommended. Side effects from overuse are also more severe. They can include:

• breathing problems
• confusion
• feeling jittery, restless, or agitated
• extreme drowsiness
• hallucinations
• irritability
• seizures
• severe nausea
• severe vomiting
• kidney stones

Symptoms of kidney stones can include:

• fever
• chills
• vomiting
• severe, persisting pain in your back or side
• burning pain during urination
• foul-smelling urine
• cloudy urine
• blood in your urine

Stop taking this drug and contact your doctor immediately if you experience any of these severe side effects.

Drug interactions and serotonin syndrome

If you take certain drugs for depression or Parkinson’s disease, called monoamine oxidase inhibitors (MAOIs), do not take Mucinex DM. Taking Mucinex DM while you take MAOIs can lead to a severe reaction called serotonin syndrome. Serotonin syndrome affects your heart and blood vessels. It’s a life-threatening reaction.

Learn more: Serotonin syndrome symptoms, causes, treatments, and more »

MAOIs include:

• isocarboxazid
• phenelzine
• rasagiline
• selegiline
• tranylcypromine

Other drugs that can increase your serotonin levels and lead to serotonin syndrome if you take Mucinex DM include drugs that treat depression, anxiety, and obsessive-compulsive disorder, such as:

• fluoxetine (Prozac)
• paroxetine

Talk to your doctor before using Mucinex DM if you currently take any of these drugs.

Talk with your doctor

If you use Mucinex DM as directed, you will most likely experience only mild side effects, if you experience side effects at all. Most severe side effects of Mucinex DM come from overuse and misuse of this drug. If you have any doubts about taking this drug, talk to your doctor. Checking with your doctor for side effects is especially important if you take other drugs or have other conditions.

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