Azithromycin 500mg Sdv Inj, 1 Vial
Overview
What is this medicine?
How to Use This Medicine
If you need to store this medication at home, consult with your doctor, nurse, or pharmacist to determine the proper storage procedure.
If you miss a dose, contact your doctor immediately to receive guidance on the next steps to take.
Lifestyle & Tips
- It is important to complete the full course of treatment, even if you start feeling better, to ensure the infection is fully cleared and to prevent antibiotic resistance.
- Do not use this medication for viral infections like the common cold or flu, as it will not be effective and can contribute to antibiotic resistance.
- Report any new or worsening symptoms to your healthcare provider.
Available Forms & Alternatives
Available Strengths:
- Azithromycin 500mg Inj, 1 Vial
- Azithromycin 1gm Pak Powder
- Azithromycin 600mg Tablets
- Azithromycin 200mg/5ml Susp 15ml
- Azithromycin 200mg/5ml Susp 30ml
- Azithromycin 200mg/5ml Susp 22.5ml
- Azithromycin 100mg/5ml Susp 15ml
- Azithromycin 500mg Sdv Inj, 1 Vial
- Azithromycin 250mg Tablets 6-Pak
- Azithromycin 600mg Tablets
- Azithromycin 500mg Tablets Tri-Pack
- Azithromycin 250mg Tablets
- Azithromycin 500mg Tablets
- Azithromycin 600mg Tablets
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 watery (see below for more information on diarrhea)
Stomach pain, cramps, or very loose stools
Important Information About Diarrhea:
Diarrhea is a common side effect of antibiotics. However, in rare cases, a severe form of diarrhea called Clostridioides difficile-associated diarrhea (CDAD) may occur. CDAD can happen during or several months after taking antibiotics and may lead to a life-threatening bowel problem. If you experience stomach pain, cramps, or very loose, watery, or bloody stools, contact your doctor immediately. Before treating diarrhea, consult with your doctor.
Liver Problems:
Liver problems have been reported with this medication, and in rare cases, they have been fatal. If you experience any of the following symptoms, contact your doctor right away:
Dark urine
Tiredness
Decreased appetite
Upset stomach or stomach pain
Light-colored stools
Vomiting
Yellow skin or eyes
Severe Skin Reactions:
Severe skin reactions, including Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), and other serious reactions, may occur with this medication. These reactions can be life-threatening and may affect other organs in the body. If you experience any of the following symptoms, seek medical help immediately:
Red, swollen, blistered, or peeling skin
Red or irritated eyes
Sores in your mouth, throat, nose, eyes, genitals, or any areas of skin
Fever
Chills
Body aches
Shortness of breath
Swollen glands
Other Side Effects:
Like all medications, this drug may cause side effects. Many people experience no side effects or only minor ones. If you experience any of the following side effects or any other side effects that bother you or do not go away, contact your doctor:
Headache
Diarrhea
Stomach pain
Upset stomach
Vomiting
Pain at the injection site
Reporting Side Effects:
If you have questions about side effects or want to report a side effect, 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 several months after treatment)
- New or worsening rash, hives, or itching
- Swelling of the face, lips, tongue, or throat (difficulty breathing or swallowing)
- Yellowing of the skin or eyes (jaundice)
- Dark urine or pale stools
- Severe stomach pain, nausea, or vomiting
- Fast, pounding, or irregular heartbeat, dizziness, or fainting
- Unusual muscle pain or weakness
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. Be sure to describe the allergic reaction and its symptoms.
If you have previously experienced liver problems or jaundice (yellowing of the skin or eyes) while taking this medication.
Certain health conditions, such as:
+ Abnormal heart rhythms, including a prolonged QTc interval on an electrocardiogram (ECG) or other irregular heartbeats.
+ Slow heartbeat or low levels of potassium or magnesium in your blood.
+ Heart failure, also known as a weak 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, particularly those that prolong the QT interval. There are many medications that can have this effect, so it is crucial to consult with your doctor or pharmacist if you are unsure.
This list is not exhaustive, and it is vital to discuss all your medications (prescription, over-the-counter, natural products, and vitamins) and health conditions with your doctor and pharmacist. They will help determine whether it is safe for you to take this medication with your existing health conditions and medications. Never start, stop, or change the dosage 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 a prolonged QT interval, which may 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 signs of myasthenia gravis, such as new or worsening muscle weakness, difficulty chewing or swallowing, breathing problems, droopy eyelids, or changes in vision (e.g., blurred vision or double vision), can occur in people with or without a history of the condition. If you experience any of these symptoms, contact your doctor immediately.
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 right away.
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 (e.g., 1-800-222-1222). Treatment is symptomatic and supportive. Gastric lavage and supportive measures may be indicated.
Drug Interactions
Contraindicated Interactions
- Pimozide (risk of severe QT prolongation and arrhythmias)
Major Interactions
- Amiodarone (increased risk of QT prolongation, Torsades de Pointes)
- Dofetilide (increased risk of QT prolongation, Torsades de Pointes)
- Sotalol (increased risk of QT prolongation, Torsades de Pointes)
- Quinidine (increased risk of QT prolongation, Torsades de Pointes)
- Disopyramide (increased risk of QT prolongation, Torsades de Pointes)
- Procainamide (increased risk of QT prolongation, Torsades de Pointes)
- Cisapride (increased risk of QT prolongation, Torsades de Pointes)
- Ergot alkaloids (e.g., Ergotamine, Dihydroergotamine - risk of acute ergot toxicity)
- Warfarin (increased anticoagulant effect, elevated INR)
- Digoxin (increased serum digoxin levels)
- Colchicine (increased colchicine exposure, toxicity)
- Statins (e.g., Simvastatin, Lovastatin - increased risk of myopathy/rhabdomyolysis)
Moderate Interactions
- Antacids (oral only, not relevant for IV)
- Nelfinavir (increased azithromycin concentrations)
- Cyclosporine (potential for increased cyclosporine levels)
- Phenytoin (potential for increased phenytoin levels)
- Theophylline (potential for increased theophylline levels)
- Fluoroquinolones (e.g., Moxifloxacin, Levofloxacin - additive QT prolongation risk)
- Antipsychotics (e.g., Ziprasidone, Quetiapine - additive QT prolongation risk)
- Tricyclic antidepressants (e.g., Amitriptyline - additive QT prolongation risk)
Minor Interactions
- Not available
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 of therapy, if clinically indicated.
Rationale: To assess baseline QTc interval, especially in patients with known QT prolongation, risk factors for QT prolongation (e.g., uncorrected hypokalemia/hypomagnesemia, bradycardia, heart failure), or those receiving other QT-prolonging drugs.
Timing: Prior to initiation of therapy, if clinically indicated.
Routine Monitoring
Frequency: Daily during IV therapy, then as clinically indicated.
Target: Resolution of infection symptoms (e.g., fever, cough, pain).
Action Threshold: Lack of improvement or worsening symptoms may indicate treatment failure, resistance, or alternative diagnosis.
Frequency: Daily during IV therapy, then as clinically indicated.
Target: Absence of rash, severe diarrhea, jaundice, irregular heartbeat.
Action Threshold: Development of significant adverse effects requires evaluation and potential discontinuation.
Frequency: As clinically indicated, especially with prolonged therapy or in patients with pre-existing hepatic impairment.
Target: Within normal limits or stable from baseline.
Action Threshold: Significant elevation of liver enzymes (e.g., >3x ULN) may warrant discontinuation.
Frequency: As clinically indicated, especially in patients with risk factors for QT prolongation or those on concomitant QT-prolonging medications.
Target: QTc < 450 ms (men), < 470 ms (women).
Action Threshold: QTc prolongation > 500 ms or increase of > 60 ms from baseline may warrant discontinuation or close monitoring.
Frequency: More frequently (e.g., 2-3 times per week) during co-administration and for several days after azithromycin discontinuation.
Target: Therapeutic range for indication.
Action Threshold: INR outside therapeutic range requires warfarin dose adjustment.
Symptom Monitoring
- Severe or persistent diarrhea (may indicate Clostridioides difficile-associated diarrhea)
- Rash, hives, itching, swelling of face/lips/tongue/throat (signs of allergic reaction)
- Yellowing of skin or eyes (jaundice), dark urine, pale stools, severe stomach pain, nausea, vomiting (signs of hepatotoxicity)
- Palpitations, dizziness, fainting, irregular heartbeat (signs of QT prolongation/arrhythmia)
- Muscle pain, weakness, dark urine (signs of rhabdomyolysis, especially with statins)
- 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, but there are no adequate and well-controlled studies in pregnant women. It should be used during pregnancy only if clearly needed and the potential benefit outweighs the potential risk to the fetus.
Trimester-Specific Risks:
Lactation
Azithromycin is excreted in human milk. The amount of azithromycin ingested by a breastfed infant is low. The American Academy of Pediatrics considers azithromycin compatible with breastfeeding. Monitor breastfed infants for potential adverse effects such as diarrhea, vomiting, or rash.
Pediatric Use
Azithromycin IV is approved for use in pediatric patients for certain indications (e.g., CAP). Dosing is weight-based. Safety and effectiveness in infants younger than 6 months for CAP have not been established. Close monitoring for adverse effects is crucial.
Geriatric Use
No specific dosage adjustment is required for elderly patients. However, elderly patients may be more susceptible to QT prolongation due to a higher prevalence of underlying cardiac conditions or concomitant medications. Monitor ECG and electrolytes closely in this population.
Clinical Information
Clinical Pearls
- Azithromycin IV must be reconstituted and then diluted prior to intravenous infusion. It should be infused over no less than 60 minutes.
- Do not administer azithromycin IV as a bolus or intramuscularly.
- Azithromycin is not effective against viral infections; avoid inappropriate use to prevent antibiotic resistance.
- Patients should be switched from IV to oral azithromycin as soon as clinically appropriate.
- Be aware of the risk of Clostridioides difficile-associated diarrhea (CDAD), which can occur during or even months after azithromycin therapy.
- Monitor for signs of hepatotoxicity and cardiac arrhythmias (especially QT prolongation).
Alternative Therapies
- Other macrolides (e.g., Clarithromycin, Erythromycin - though IV forms may have different side effect profiles or indications)
- Beta-lactam antibiotics (e.g., Ceftriaxone, Ampicillin/Sulbactam for CAP or PID)
- Fluoroquinolones (e.g., Levofloxacin, Moxifloxacin for CAP or PID)
- Tetracyclines (e.g., Doxycycline for PID)