Generic name: guaifenesin
Drug class: Expectorants
Medically reviewed by A Ras MD.
What is Mucinex?
Mucinex is a prescription medicine that is used to thin mucus so it can be taken from the body by coughing.
Before taking Mucinex, tell your doctor:
- If you are allergic to Mucinex; any part of this medicine; or any other drugs, foods, or substances. Tell your doctor about the allergy and what signs you had.
- If you have a cough with a lot of mucus.
- If you have a long-term cough caused by smoking or being around smoke, or lung problems like asthma or emphysema.
This is not a list of all drugs or health problems that interact with this medicine.
Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take Mucinex with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.
What are some things I need to know or do while I take Mucinex?
- Tell all of your health care providers that you take Mucinex. This includes your doctors, nurses, pharmacists, and dentists.
- Different brands of Mucinex may be for use in different ages of children. Talk with the doctor before giving Mucinex to a child.
- Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using Mucinex while you are pregnant.
- Tell your doctor if you are breast-feeding. You will need to talk about any risks to your baby.
How is Mucinex best taken?
Use Mucinex as ordered by your doctor. Read all information given to you. Follow all instructions closely.
- Take with or without food. Take with food if it causes an upset stomach.
- Drink lots of noncaffeine liquids unless told to drink less liquid by your doctor.
- Swallow whole. Do not chew, break, or crush.
What do I do if I miss a dose?
- If you take Mucinex on a regular basis, take a missed dose as soon as you think about it.
- If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
- Do not take 2 doses at the same time or extra doses.
- Many times Mucinex is taken on an as needed basis. Do not take more often than told by the doctor.
What are the side effects of Mucinex that I need to call my doctor about immediately?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
- Cough that does not go away.
What are some other side effects of Mucinex?
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if you have any side effects that bother you or do not go away.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at https://www.fda.gov/medwatch.
If overdose is suspected:
If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
How do I store and/or throw out Mucinex?
- Store at room temperature.
- Store in a dry place. Do not store in a bathroom.
- Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
- Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.
PRINCIPAL DISPLAY PANEL – 118 ML BOTTLE CARTON
& Sore Throat
|Acetaminophen 325 mg||Pain Reliever/Fever Reducer|
|Dextromethorphan HBr 10 mg||Cough Suppressant|
|Guaifenesin 200 mg||Expectorant|
|Phenylephrine HCl 5 mg||Nasal Decongestant|
SRC: NLM .