Mucinex Fast-Max Cold/flu Liq

Acetaminophen: Produces analgesia by inhibiting prostaglandin synthesis in the central nervous system and peripherally blocking pain impulse generation. Produces antipyresis by inhibiting the hypothalamic heat-regulating center. Dextromethorphan: Acts centrally on the cough center in the medulla to elevate the cough threshold. Guaifenesin: Acts as an expectorant by increasing the volume and decreasing the viscosity of secretions in the trachea and bronchi, thereby facilitating removal of the secretions by ciliary action and cough reflex. Phenylephrine: A direct-acting sympathomimetic amine that acts on alpha-adrenergic receptors in the arterioles of the nasal mucosa to produce vasoconstriction, leading to reduced swelling and congestion.

Urgent Side Effects: Seek Medical Help Right Away

Although rare, some people may experience severe and potentially life-threatening side effects while taking this medication. If you notice any of the following symptoms, contact your doctor or seek immediate medical attention:

Signs of an allergic reaction, such as:
+ Rash
+ Hives
+ Itching
+ Red, swollen, blistered, or peeling skin (with or without fever)
+ Wheezing
+ Tightness in the chest or throat
+ Difficulty breathing, swallowing, or talking
+ Unusual hoarseness
+ Swelling of the mouth, face, lips, tongue, or throat
Signs of liver problems, including:
+ Dark urine
+ Fatigue
+ Decreased appetite
+ Upset stomach or stomach pain
+ Light-colored stools
+ Vomiting
+ Yellow skin or eyes
Signs of high blood pressure, such as:
+ Severe headache or dizziness
+ Fainting or loss of consciousness
+ Changes in vision
Chest pain or pressure
Rapid heartbeat
Shakiness
Difficulty urinating or changes in urine output
Severe skin reaction (Stevens-Johnson syndrome/toxic epidermal necrolysis), which can cause:
+ Red, swollen, blistered, or peeling skin (with or without fever)
+ Red or irritated eyes
+ Sores in the mouth, throat, nose, or eyes

Other Possible Side Effects

Like all medications, this drug can cause side effects. While many people may not experience any side effects or only minor ones, it's essential to discuss any concerns with your doctor. If you experience any of the following side effects or any other unusual symptoms, contact your doctor or seek medical attention:

Dizziness
Feeling nervous and excitable
* Difficulty sleeping

Reporting Side Effects

If you have questions or concerns about side effects, contact your doctor for medical advice. You can also report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch.

Before Taking This Medication: Important Information to Share with Your Doctor

It is essential to inform your doctor about the following conditions to ensure safe treatment:

Any allergies you have, including allergies to this medication, its components, or other substances, such as foods or drugs. Describe the allergic reaction you experienced, including the symptoms that occurred.
If you have liver disease, as this may affect how your body processes the medication.
If you have a cough that produces a significant amount of mucus, a chronic cough caused by smoking or exposure to smoke, or lung conditions like asthma or emphysema.
If you have taken certain medications for depression or Parkinson's disease within the last 14 days, including isocarboxazid, phenelzine, tranylcypromine, selegiline, or rasagiline, as this may increase the risk of very high blood pressure.
* If you are currently taking linezolid or methylene blue, as these medications can interact with this drug.

This list is not exhaustive, and it is crucial to disclose all your medications, including prescription and over-the-counter drugs, natural products, and vitamins, as well as any health problems you have. Your doctor and pharmacist need this information to assess potential interactions and ensure it is safe for you to take this medication. Never start, stop, or change the dose of any medication without consulting your doctor first.

It is essential to inform all your healthcare providers, including doctors, nurses, pharmacists, and dentists, that you are taking this medication. Adhere strictly to the dosage instructions provided by your doctor, as taking more than prescribed may increase your risk of experiencing severe side effects. Additionally, do not take this medication for a longer duration than recommended by your doctor.

This medication contains acetaminophen, which has been associated with liver problems, including the need for a liver transplant or even death, particularly when taken in excessive amounts. The majority of these cases involved individuals taking more than 4,000 milligrams (mg) of acetaminophen per day, often in combination with multiple products containing acetaminophen.

To minimize the risk of liver problems, it is crucial to avoid taking other products that contain acetaminophen. Carefully examine the labels of all medications and supplements to ensure you are not exceeding the recommended daily intake of acetaminophen. Follow the dosage instructions precisely, and do not exceed the maximum daily dose of acetaminophen as directed by your doctor or pharmacist. The recommended daily limit is 4,000 mg for some individuals, but those with liver problems or children may require a lower dose. If you are unsure about the safe amount of acetaminophen for your specific situation, consult your doctor or pharmacist. If you suspect you have taken too much acetaminophen, contact your doctor immediately, even if you are not experiencing any symptoms.

Before consuming alcohol, discuss the potential risks with your doctor. It is also important to inform all your healthcare providers and laboratory personnel that you are taking this medication, as it may affect certain lab test results. If you are following a low-sodium or sodium-free diet, consult your doctor, as some formulations of this medication may contain sodium.

When considering administering this medication to a child, consult your doctor first, as different brands may be suitable for different age groups. If you are pregnant, planning to become pregnant, or breastfeeding, discuss the potential benefits and risks of this medication with your doctor to make an informed decision.

• Monoamine Oxidase Inhibitors (MAOIs) - concurrent use or within 14 days of stopping MAOIs (risk of hypertensive crisis with phenylephrine, serotonin syndrome with dextromethorphan)
• Other acetaminophen-containing products (risk of overdose)

• Alcohol (increased risk of liver damage with acetaminophen)
• Warfarin (increased INR with acetaminophen, especially with chronic high doses)
• Other sympathomimetics (e.g., decongestants, appetite suppressants, amphetamines - increased risk of cardiovascular effects with phenylephrine)
• Tricyclic antidepressants (TCAs) (potentiate pressor effects of phenylephrine)
• Beta-blockers (may increase pressor effects of phenylephrine)
• Serotonergic drugs (e.g., SSRIs, SNRIs, triptans - increased risk of serotonin syndrome with dextromethorphan)
• CYP2D6 inhibitors (e.g., fluoxetine, paroxetine, quinidine - increased dextromethorphan exposure)

• Anticholinergic drugs (may reduce GI motility, potentially affecting absorption)
• Certain antiepileptic drugs (e.g., carbamazepine, phenytoin - increased risk of acetaminophen hepatotoxicity)
• Cholestyramine (reduces acetaminophen absorption)

• None commonly cited for this combination

• Persistent or worsening cough
• Cough with excessive mucus or blood
• High fever (over 103°F or 39.4°C)
• Fever lasting more than 3 days
• Rash
• Persistent headache
• Nervousness, dizziness, or sleeplessness
• Significant increase in blood pressure or heart rate
• Signs of liver damage (yellowing of skin/eyes, dark urine, severe abdominal pain)

Category C. Use only if the potential benefit justifies the potential risk to the fetus. Acetaminophen is generally considered safe in pregnancy at recommended doses, but dextromethorphan, guaifenesin, and phenylephrine have limited human data or animal studies showing adverse effects at high doses. Consult a healthcare provider before use.

L3 (Moderately Safe). Acetaminophen is generally considered safe. Dextromethorphan, guaifenesin, and phenylephrine are excreted into breast milk in small amounts. Monitor infant for drowsiness, irritability, or feeding difficulties. Consult a healthcare provider before use.

Not for use in children under 6 years of age without consulting a doctor. For children 6-12 years, use pediatric-specific formulations and dosing. Always use the dosing device provided with the product. Accidental overdose is a significant risk in this population.

Use with caution in elderly patients, especially those with pre-existing conditions such as hypertension, heart disease, diabetes, or prostate enlargement, due to the phenylephrine component. Start with the lowest effective dose and monitor for adverse effects. Increased sensitivity to CNS and cardiovascular effects may occur.

• Always check the active ingredients of other medications being taken to avoid accidental overdose, especially with acetaminophen.
• Advise patients with high blood pressure, heart disease, diabetes, or thyroid disease to consult a doctor before using due to the phenylephrine content.
• Counsel patients on the importance of not exceeding the recommended dose and duration of use.
• This product is for symptomatic relief and does not treat the underlying cause of the cold or flu.
• Encourage non-pharmacological measures like rest and hydration alongside medication.

• Single-ingredient acetaminophen for pain/fever
• Single-ingredient dextromethorphan for cough
• Single-ingredient guaifenesin for mucus
• Single-ingredient phenylephrine or pseudoephedrine for congestion
• Nasal saline sprays for congestion
• Honey for cough (for children over 1 year)

If your symptoms or health issues persist or worsen, it is essential to contact your doctor for further guidance. To ensure your safety, never share your medication with others or take someone else's medication. Some medications may come with an additional patient information leaflet, so it's a good idea to check with your pharmacist for more information. If you have any questions or concerns about this medication, don't hesitate to reach out to your doctor, nurse, pharmacist, or other healthcare provider. In the event of a suspected overdose, immediately call your local poison control center or seek emergency medical attention. When seeking help, be prepared to provide details about the overdose, including the medication taken, the amount, and the time it occurred.