Fish Penicillin 500mg – 60 Tablets
$89.95 $99.95
In Stock
- FREE 1-3 day shipping over $49
Fish Pen – Penicillin 500mg 60 Tablets | FixMox
Trusted Gram-Positive Fish Antibiotic – Longstanding and Reliable
Fix Pen 500mg provides effective treatment for common gram-positive bacterial infections in aquarium fish. Each tablet contains 500mg of penicillin, a time-tested antibiotic used by aquarists to treat conditions like fin rot, mouth rot, and skin ulcers. Explore more trusted medications like Fix Pen at FixMox.
Key Benefits:
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Proven Treatment: Penicillin has decades of clinical use in ornamental fish care.
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Gram-Positive Coverage: Fights pathogens responsible for skin, fin, and mouth infections.
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Easy Administration: Tablets can be crushed, dissolved, or given directly to fish.
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Safe & Effective: Suitable for most freshwater species when dosed properly.
Instructions for Use
Purpose: Fix Pen is used to treat bacterial infections caused by gram-positive organisms such as Streptococcus, Aeromonas, and Mycobacteria in aquarium fish.
Cautions:
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Not for human use.
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Keep away from children and pets.
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May be harmful to invertebrates and delicate aquatic plants.
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Remove activated carbon filtration during treatment.
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Avoid use in reef tanks without expert advice.
Dosage Guidelines:
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Standard Dose: Add 1 tablet (500mg) per 20 gallons of water.
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Repeat: Every 24 hours.
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Duration: Continue for 5 to 10 days depending on the condition.
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Water Tip: Perform a partial water change between treatments.
Consult a veterinarian or aquatic expert for accurate dosage based on tank size and infection severity.
How to Use:
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Oral Administration: Give tablet directly if fish can tolerate handling.
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Food Mixing: Crush tablet and blend with fish food to ensure full consumption.
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Dissolved Use: Dissolve tablet into tank water for broad treatment.
Ingredients:
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Active Ingredient: Penicillin – 500mg per tablet
Important Notices:
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Water Changes: Perform 20–25% partial changes daily during treatment.
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Monitor: Observe for behavior changes or side effects.
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Stop Use: If no improvement after 5 days or adverse effects are seen, discontinue use.
Storage Instructions:
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Store in a cool, dry, and dark place.
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Avoid exposure to moisture or direct light.
Your order of 50$ 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.


