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Fish Pen - Penicillin 500mg 60 Tablets

$89.99 $99.99

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Check The Latest Expiration Dates

Updated  05/21/2025

Looking for the freshest and most reliable fish antibiotics online? Whether you're stocking up on Fish Mox, Fish Flex, Fish Zole, or Fish Sulfa, knowing the expiration dates is essential for ensuring the effectiveness of your aquarium medication. We've created this regularly updated expiration list so you can shop confidently. Don't risk outdated meds—compare your current product with the latest fish antibiotics expiration dates from trusted sources like Thomas Labs Pets.

From broad-spectrum fish antibiotics like amoxicillin, ciprofloxacin, and doxycycline, to advanced treatments like fluconazole and metronidazole, we’ve got you covered. Make sure your fish meds are safe, current, and fully potent with the latest updates below.

Fish Antibiotics Expiration Dates

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Fish Pen - Penicillin 500mg (60 Tablets) | Broad-Spectrum Aquarium Antibiotic

High-Potency Treatment for Bacterial Infections in Aquarium Fish

Fish Pen - Penicillin 500mg (60 Tablets) is a trusted broad-spectrum fish antibiotic formulated to combat gram-positive bacterial infections such as fin rot, gill disease, septicemia, and popeye. Each tablet delivers 500 mg of penicillin, ensuring a powerful and consistent treatment. Designed for both freshwater and saltwater aquariums, this high-quality fish medication helps maintain fish health without harming the aquatic ecosystem.

Explore More Fish Antibiotics

Key Benefits

Broad-Spectrum Antibiotic – Effectively treats fin rot, gill disease, popeye, and bacterial septicemia.
High-Strength Formula – Each 500mg tablet ensures strong and effective bacterial infection control.
Safe for Aquatic Use – Specially designed to eliminate infections while maintaining aquarium balance.
Convenient Size – The 60-tablet pack is ideal for multiple treatments or medium-sized aquariums.
Trusted Quality – Manufactured under strict quality standards to ensure purity and effectiveness.

Dosage Instructions

Add 1 tablet (500 mg) per 20 gallons of aquarium water.
Repeat every 24 hours for 5-10 days, depending on infection severity.

Usage Tips & Cautions

Remove activated carbon filters during treatment for maximum effectiveness.
Perform 20-25% water changes between doses to maintain water quality.
Not for human use.

Ingredients

  • Active Ingredient: Penicillin 500 mg per tablet.

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Fish Pen - Penicillin 500mg 60 TabletsPenicillin 500 mg 60 TabletsFish Pen - Penicillin 500 mg