Fish Pen - Penicillin 500mg 60 Tablets
$89.99 $99.99
In Stock
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Check The Latest Expiration Dates
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 Don't risk outdated meds—compare your current product with the latest fish antibiotics expiration dates from trusted sources like Thomas Labs Pets.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 Mox - Amoxicillin 500 mg 100 Capsules – Expires: 08/2027
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Fish Mox - Amoxicillin 250 mg 100 Capsules – Expires: 05/2027
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Fish Zole - Metronidazole 250 mg 60 Tablets – Expires: 12/2026
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Fish Zole - Metronidazole 500 mg 60 Tablets – Expires: 02/2027
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Fish Flex - Cephalexin 250 mg 100 Capsules – Expires: 04/2026
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Fish Flex - Cephalexin 500 mg 100 Capsules – Expires: 06/2027
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Fish Doxy - Doxycycline 100 mg 30 Capsules – Expires: 02/2026
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Fish Doxy - Doxycycline 100 mg 60 Capsules – Expires: 06/2026
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Fish Pen - Penicillin 500 mg 30 Tablets – Expires: 06/2026
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Fish Pen - Penicillin 500 mg 60 Tablets – Expires: 06/2026
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Fish Flox - Ciprofloxacin 500 mg 30 Capsules – Expires: 04/2027
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Fish Flox - Ciprofloxacin 500 mg 60 Capsules – Expires: 04/2027
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Fish Sulfa - Sulfamethoxazole & Trimethoprim 960 mg 30 Tablets – Expires: 12/2028
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Fish Sulfa - Sulfamethoxazole & Trimethoprim 960 mg 60 Tablets – Expires: 12/2028
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Fish Zithro - Azithromycin 250 mg 30 Tablets – Expires: 06/2027
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Fish Cin - Clindamycin 150 mg 100 Capsules – Expires: 08/2026
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Reef Flux - Fluconazole 200 mg 10 Capsules – Expires: 02/2027
AS-10015
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FREE SHIPPING ON ALL ORDER OVER 49$
Guaranteed Fresh Stock with Latest Expiration Dates +2027
Guaranteed Fresh Stock with Latest Expiration Dates +2027
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Fast, Same-Day Shipping Available Before 1 PM CST.
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.
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.
Related Products
- Fish Pen Forte - Penicillin 500mg (30 Tablets)
- Fish Zole - Metronidazole 500mg (60 Tablets)
- Fish Mox Forte - Amoxicillin 500mg (100 Capsules)
- Fish Flox - Ciprofloxacin 500mg (60 Capsules)
- Fish Doxycycline - 100mg (60 Capsules)
Usually ships within 1 business day to USA & CANADA
Shipping Options:
FREE SHIPPING ON ALL ORDERS- USPS First Class Package : $6.95, 3-5 days (USPS First Class Package)
- FedEx 2Day®: $29.95, 1-Business Days (FedEx)
More Shipping Info:
- Orders placed Monday-Friday before 2pm Central Time usually ship the same day.
- We ship to the USA And Canada only.



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