Fish Zithro (Azithromycin) 250mg 30 Tablets
$95.99 $109.95
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Fish Zithro (Azithromycin) 250mg – 30 Tablets | Fish Antibiotic for Fin Rot, Gill Disease & Columnaris
Fish Zithro Azithromycin 250mg Tablets are a trusted solution for treating bacterial infections in ornamental and aquarium fish. Formulated with Azithromycin, a potent broad-spectrum macrolide antibiotic, Fish Zithro is highly effective against gram-positive and gram-negative bacteria, including Mycobacterium, Aeromonas, and Vibrio species.
This treatment is ideal for conditions such as fin rot, columnaris, skin ulcers, and septicemia, making it a staple in every aquarist’s fish health arsenal.
Key Benefits of Fish Zithro Azithromycin Tablets
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Broad-spectrum antibacterial action
Effective against both internal and external bacterial infections. -
Targeted treatment for aquatic illnesses
Treats gill disease, ulcers, tail rot, columnaris, and systemic bacterial infections. -
Long-lasting therapeutic effects
Maintains stable antibiotic levels in the tank, reducing dosing frequency and fish stress. -
Flexible administration methods
Can be dissolved directly in tank water or mixed into medicated food for internal treatment. -
Safe for tank environments
Minimal disruption to beneficial bacteria and aquarium filtration systems.
Explore the full Fish Zithro collection for all available formulations.
How to Use Fish Zithro 250mg Tablets
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Dosage: Dissolve 1 tablet per 10 gallons of water.
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Treatment Duration: Continue treatment for 5 to 7 days.
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Best Practice: Administer treatment in a hospital or quarantine tank to protect your primary aquarium’s ecosystem.
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Water Quality: Perform partial water changes during treatment and monitor parameters closely.
Active Ingredients
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Azithromycin – 250 mg per tablet (macrolide antibiotic)
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Excipients – Pharmaceutical-grade, aiding in tablet stability and dissolution
Warnings & Precautions
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For aquarium use only. Not intended for human or food animal consumption.
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Store in a dry, cool environment away from direct light.
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Keep out of reach of children and pets.
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Avoid overdosing; improper use may lead to antibiotic resistance or harm to fish and tank biology.
Possible Side Effects
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Temporary stress or lethargy in fish
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Minor cloudiness or discoloration in water
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Risk of bacterial resistance with prolonged or unnecessary use
FAQs – Fish Zithro Azithromycin 250mg
What is Fish Zithro used for?
Fish Zithro treats bacterial infections like fin rot, columnaris, ulcers, gill disease, and systemic conditions in freshwater and saltwater fish.
Can it be used in a community tank?
Treatment should be administered in a separate hospital tank to avoid harming beneficial bacteria or healthy fish.
How does Azithromycin work in fish?
Azithromycin inhibits protein synthesis in bacteria, stopping growth and allowing the fish's immune system to respond effectively.
Is Fish Zithro safe for all species?
Generally safe for most ornamental fish, but use caution with invertebrates. Always monitor water quality and fish behavior during treatment.
Can I treat fungal infections with Fish Zithro?
No. It targets bacterial infections only. Use antifungal agents like Reef Flux (Fluconazole) for fungal diseases.
How should unused tablets be disposed of?
Follow local pharmaceutical disposal guidelines. Do not flush or dispose into natural water sources.
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Shipping & Returns
We offer Ground, Express, Priority, and International shipping options to meet your urgency and location.
Your order of 49$ or more gets free standard delivery.
- Standard delivered 4-5 Business Days
- Express delivered 2-4 Business Days
Orders are processed and delivered Monday-Friday (excluding public holidays)
members enjoy free returns.



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