Zithromax 100mg Susp 15ml(green Bx)
Overview
What is this medicine?
How to Use This Medicine
To ensure you get the most benefit from your medication, follow these steps:
Take your medication exactly as directed by your doctor. Read all the information provided with your prescription and follow the instructions carefully.
You can take this medication with or without food.
However, do not take antacids that contain magnesium or aluminum at the same time as your medication. If you have any questions, consult your doctor or pharmacist.
Continue taking your medication as instructed by your doctor or healthcare provider, even if you start to feel better.
Measuring and Administering Your Medication
Before using the liquid form of this medication, shake the bottle well.
Measure liquid doses carefully using the measuring device provided with the medication. If a device is not included, ask your pharmacist for a suitable measuring device.
Storing and Disposing of Your Medication
Store the liquid (suspension) form of this medication at room temperature or in the refrigerator.
Discard any unused portion of the medication after 10 days.
Keep the medication in its original container and ensure the lid is tightly closed.
What to Do If You Miss a Dose
If you miss a dose, take it as soon as you remember.
However, if it is close to the time for your next scheduled dose, skip the missed dose and resume your regular dosing schedule.
Do not take two doses at the same time or take extra doses to make up for a missed dose.
Lifestyle & Tips
- Take the medication exactly as prescribed by your doctor. Do not skip doses or stop taking it early, even if you feel better, to prevent the infection from returning and to reduce the risk of antibiotic resistance.
- Shake the oral suspension well before each use.
- Use the provided measuring device (oral syringe or spoon) to ensure an accurate dose.
- Azithromycin oral suspension can be taken with or without food.
- Do not share this medication with others.
- Avoid antacids containing aluminum or magnesium within 2 hours before or 4 hours after taking azithromycin.
- Stay hydrated, especially if experiencing diarrhea.
Available Forms & Alternatives
Available Strengths:
- Zithromax 200mg Sus 15ml(purple Bx)
- Zithromax 100mg Susp 15ml(green Bx)
- Zithromax 200mg Sus 22.5ml(white Bx
- Zithromax 1gm Powder Packet
- Zithromax 200mg Sus 30ml(yellow Bx)
- Zithromax 600mg Tabs
- Zithromax 250mg Tabs (z-Pak)
- Zithromax 500mg Tab Tri-Pak
- Zithromax 500mg Tablets
- Zithromax 500mg Sdv Inj, 1 Vial
- Zithromax 250mg Tablets
Generic Alternatives:
Dosing & Administration
Adult Dosing
Condition-Specific Dosing:
Pediatric Dosing
Dose Adjustments
Renal Impairment:
Hepatic Impairment:
Pharmacology
Mechanism of Action
Pharmacokinetics
Absorption:
Distribution:
Elimination:
Pharmacodynamics
Safety & Warnings
Side Effects
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
+ Trouble breathing, swallowing, or talking
+ Unusual hoarseness
+ Swelling of the mouth, face, lips, tongue, or throat
Chest pain or pressure
Fast heartbeat or abnormal heartbeat
Dizziness or fainting
Changes in hearing
Fever
Changes in eyesight
Diarrhea, especially if it is severe, bloody, or accompanied by stomach pain or cramps (a rare but potentially life-threatening condition called C. diff-associated diarrhea, or CDAD, may occur)
Liver problems, which may be indicated by:
+ Dark urine
+ Tiredness
+ Decreased appetite
+ Upset stomach or stomach pain
+ Light-colored stools
+ Vomiting
+ Yellow skin or eyes
Severe skin reactions, including:
+ Stevens-Johnson syndrome (SJS)
+ Toxic epidermal necrolysis (TEN)
+ Other serious reactions, which may also affect internal organs
+ Signs of these reactions may include:
- Red, swollen, blistered, or peeling skin
- Red or irritated eyes
- Sores in the mouth, throat, nose, eyes, genitals, or skin
- Fever
- Chills
- Body aches
- Shortness of breath
- Swollen glands
Other Possible Side Effects
Most people experience either no side effects or only mild side effects while taking this medication. However, if you notice any of the following symptoms or if they persist or bother you, contact your doctor or seek medical attention:
Headache
Diarrhea
Stomach pain
Upset stomach
* Vomiting
Reporting Side Effects
This list is not exhaustive, and you may experience other side effects not mentioned here. If you have questions or concerns about side effects, contact your doctor. You can also report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch.
Seek Immediate Medical Attention If You Experience:
- Severe, watery diarrhea or bloody stools (may occur up to 2 months after stopping the medication)
- New or worsening rash, blistering, or peeling skin
- Yellowing of the skin or eyes (jaundice)
- Dark urine or pale stools
- Severe stomach pain or nausea/vomiting
- Unusual tiredness or weakness
- Fast, pounding, or irregular heartbeat
- Severe dizziness or fainting spells
- Swelling of the face, lips, tongue, or throat (signs of allergic reaction)
- Difficulty breathing or swallowing
Before Using This Medicine
It is essential to inform your doctor about the following:
Any allergies you have, including allergies to this medication, its components, or other substances, such as foods or drugs. Be sure to describe the allergic reaction you experienced, including any symptoms that occurred.
If you have previously experienced liver problems or jaundice (yellowing of the skin or eyes) while taking this medication.
Certain health conditions, including:
+ Abnormal heart rhythms, such as a prolonged QT interval on an electrocardiogram (ECG) or other irregular heartbeats
+ Slow heartbeat
+ Low levels of potassium or magnesium in your blood
+ Heart failure (a weakened heart)
+ A history of torsades de pointes, a specific type of abnormal heartbeat
If you are taking any medications that can cause abnormal heart rhythms, such as those that prolong the QT interval. There are many medications that can have this effect, so be sure to ask your doctor or pharmacist if you are unsure.
To ensure your safety, it is crucial to provide your doctor and pharmacist with a comprehensive list of:
All medications you are currently taking, including prescription and over-the-counter (OTC) medications, natural products, and vitamins
Any health problems you have
This information will help your doctor determine whether it is safe for you to take this medication with your other medications and health conditions. Never start, stop, or change the dose of any medication without first consulting your doctor.
Precautions & Cautions
It is essential to inform all your healthcare providers, including doctors, nurses, pharmacists, and dentists, that you are taking this medication. Adhere to the prescribed duration of treatment, as prolonged use may increase the risk of a second infection.
Severe Heart Rhythm Changes
This medication can cause severe heart rhythm changes, including prolonged QT interval, which can be life-threatening or fatal. If you have any questions or concerns, consult your doctor.
Myasthenia Gravis
If you have myasthenia gravis, discuss your treatment with your doctor. Monitor your symptoms closely, and contact your doctor if they worsen. Additionally, be aware that myasthenia gravis symptoms can occur in people without a prior diagnosis. Seek immediate medical attention if you experience new or worsening muscle weakness, difficulty chewing or swallowing, breathing problems, droopy eyelids, or changes in vision, such as blurred vision or double vision.
Special Considerations
If you are 65 years or older, use this medication with caution, as you may be more susceptible to side effects.
Pregnancy and Breastfeeding
If you are pregnant, plan to become pregnant, or are breastfeeding, consult your doctor to discuss the potential benefits and risks to you and your baby.
Newborns
In newborns taking this medication, a severe stomach problem can occur. If your child vomits or becomes irritable during feeding, contact your doctor immediately.
Overdose Information
Overdose Symptoms:
- Severe nausea
- Vomiting
- Diarrhea
- Reversible hearing loss
What to Do:
In case of suspected overdose, seek immediate medical attention or call a poison control center (1-800-222-1222). Treatment is symptomatic and supportive. Gastric lavage and general supportive measures are indicated.
Drug Interactions
Contraindicated Interactions
- Pimozide (risk of QT prolongation and ventricular arrhythmias)
Major Interactions
- QT-prolonging drugs (e.g., amiodarone, sotalol, quinidine, disopyramide, dofetilide, cisapride, terfenadine, astemizole, some antipsychotics like thioridazine, some fluoroquinolones like moxifloxacin, tricyclic antidepressants)
- Warfarin (increased anticoagulant effect, monitor INR)
- Nelfinavir (increased azithromycin serum concentrations)
- Ergot alkaloids (e.g., ergotamine, dihydroergotamine - risk of acute ergot toxicity)
Moderate Interactions
- Antacids containing aluminum or magnesium (decreased azithromycin peak serum concentrations, administer azithromycin at least 2 hours before or 4 hours after antacids)
- Digoxin (increased digoxin serum concentrations)
- Cyclosporine (increased cyclosporine serum concentrations)
- Colchicine (increased colchicine exposure)
- Statins (e.g., simvastatin, lovastatin - theoretical increased risk of myopathy/rhabdomyolysis, though less significant than with other macrolides)
Minor Interactions
- Zidovudine (increased zidovudine phosphorylation to its active metabolite in peripheral blood mononuclear cells, clinical significance uncertain)
Monitoring
Baseline Monitoring
Rationale: To assess baseline hepatic function, especially in patients with pre-existing liver disease, as azithromycin is primarily eliminated by the liver.
Timing: Prior to initiation in patients with known or suspected hepatic impairment.
Rationale: To assess baseline QT interval, especially in patients with known QT prolongation, risk factors for QT prolongation (e.g., uncorrected hypokalemia or hypomagnesemia, bradycardia, heart failure), or those receiving other QT-prolonging medications.
Timing: Prior to initiation in at-risk patients.
Routine Monitoring
Frequency: Regularly, especially during and after azithromycin therapy
Target: Therapeutic range for warfarin
Action Threshold: If INR is outside target range, adjust warfarin dose and monitor more frequently.
Frequency: Daily during therapy and for several weeks post-therapy
Target: N/A
Action Threshold: If signs (e.g., jaundice, dark urine, severe fatigue, abdominal pain) occur, discontinue azithromycin and perform LFTs.
Frequency: Daily during therapy
Target: N/A
Action Threshold: If symptoms (e.g., palpitations, dizziness, syncope) occur, perform ECG and consider discontinuation.
Frequency: Daily during therapy and for up to 2 months post-therapy
Target: N/A
Action Threshold: If severe, persistent diarrhea and abdominal pain occur, test for C. difficile and initiate appropriate treatment.
Symptom Monitoring
- Diarrhea (especially severe or bloody)
- Abdominal pain or cramping
- Nausea
- Vomiting
- Rash or severe skin reactions (e.g., Stevens-Johnson syndrome, DRESS syndrome)
- Yellowing of skin or eyes (jaundice)
- Dark urine
- Pale stools
- Unusual fatigue or weakness
- Irregular heartbeat or palpitations
- Dizziness or lightheadedness
- Fainting (syncope)
- Hearing changes (rare, usually reversible)
Special Patient Groups
Pregnancy
Azithromycin is classified as Pregnancy Category B. Studies in animals have not shown harm to the fetus, and there are no adequate and well-controlled studies in pregnant women. It is generally considered safe for use during pregnancy when clearly indicated and the benefits outweigh the potential risks.
Trimester-Specific Risks:
Lactation
Azithromycin is excreted in human milk in small amounts. The American Academy of Pediatrics considers azithromycin to be compatible with breastfeeding. Monitor breastfed infants for potential gastrointestinal disturbances (e.g., diarrhea, vomiting, candidiasis) or rash.
Pediatric Use
Widely used in pediatric populations for various bacterial infections. Dosing is weight-based. Safety and efficacy established for children 6 months and older for specific indications. Use in neonates and infants younger than 6 months is generally limited to specific, severe infections due to limited data and potential for infantile hypertrophic pyloric stenosis (IHPS) with macrolides (though less reported with azithromycin than erythromycin).
Geriatric Use
No specific dosage adjustment is required based solely on age. However, elderly patients may be at increased risk for QT prolongation and Torsades de Pointes, especially if they have pre-existing cardiac conditions or are on other QT-prolonging medications. Monitor closely for adverse effects.
Clinical Information
Clinical Pearls
- Azithromycin's long half-life allows for shorter treatment courses (e.g., 3-day or 5-day regimens) and once-daily dosing, which can improve patient adherence.
- It achieves high concentrations in tissues and phagocytes, leading to sustained antibacterial activity even after plasma levels decline.
- While generally well-tolerated, it carries a risk of QT prolongation, particularly in patients with pre-existing cardiac conditions, electrolyte imbalances, or concurrent use of other QT-prolonging drugs. An ECG should be considered in at-risk patients.
- Like all antibiotics, azithromycin can cause Clostridioides difficile-associated diarrhea (CDAD), ranging from mild diarrhea to fatal colitis. This can occur during or up to 2 months after therapy.
- Azithromycin is not effective against viral infections (e.g., common cold, flu). Prescribing for viral infections contributes to antibiotic resistance.
- The oral suspension should be shaken well before each use and measured accurately with a dosing syringe or spoon, not a household spoon.
Alternative Therapies
- Other macrolides (e.g., clarithromycin, erythromycin)
- Beta-lactam antibiotics (e.g., amoxicillin, amoxicillin/clavulanate, penicillin, cephalexin)
- Tetracyclines (e.g., doxycycline, minocycline)
- Fluoroquinolones (e.g., levofloxacin, moxifloxacin - generally reserved for specific indications due to broader spectrum and potential for serious side effects)
- Lincosamides (e.g., clindamycin)