-11%

Fish Flex - Cephalexin 500mg 100 Capsules

$79.99 $89.99

In Stock

FREE SHIPPING ON ALL ORDERS

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 Don't risk outdated meds—compare your current product with the latest fish antibiotics expiration dates from trusted sources like Thomas Labs Pets.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

Fish Mox - Amoxicillin 500 mg 100 Capsules – Expires: 08/2027
Fish Mox - Amoxicillin 250 mg 100 Capsules – Expires: 05/2027
Fish Zole - Metronidazole 250 mg 60 Tablets – Expires: 12/2026
Fish Zole - Metronidazole 500 mg 60 Tablets – Expires: 02/2027
Fish Flex - Cephalexin 250 mg 100 Capsules – Expires: 04/2026
Fish Flex - Cephalexin 500 mg 100 Capsules – Expires: 06/2027
Fish Doxy - Doxycycline 100 mg 30 Capsules – Expires: 02/2026
Fish Doxy - Doxycycline 100 mg 60 Capsules – Expires: 06/2026
Fish Pen - Penicillin 500 mg 30 Tablets – Expires: 06/2026
Fish Pen - Penicillin 500 mg 60 Tablets – Expires: 06/2026
Fish Flox - Ciprofloxacin 500 mg 30 Capsules – Expires: 04/2027
Fish Flox - Ciprofloxacin 500 mg 60 Capsules – Expires: 04/2027
Fish Sulfa - Sulfamethoxazole & Trimethoprim 960 mg 30 Tablets – Expires: 12/2028
Fish Sulfa - Sulfamethoxazole & Trimethoprim 960 mg 60 Tablets – Expires: 12/2028
Fish Zithro - Azithromycin 250 mg 30 Tablets – Expires: 06/2027
Fish Cin - Clindamycin 150 mg 100 Capsules – Expires: 08/2026
Reef Flux - Fluconazole 200 mg 10 Capsules – Expires: 02/2027

Aqua Lab

Thomas lab

SKU: AS-10003

FREE SHIPPING ON ALL ORDER OVER 49$

Guaranteed Fresh Stock with Latest Expiration Dates +2027

Fast, Same-Day Shipping Available Before 1 PM CST.

Product Description
Shipping & Returns

Fish Flex Forte - Cephalexin 500mg Capsules for Aquarium Fish

Broad-Spectrum Antibiotic for Bacterial Infections

Fish Flex Forte - Cephalexin 500mg (100 Capsules) is a high-potency broad-spectrum fish antibiotic designed to treat bacterial infections in aquarium fish. Each capsule contains 500 mg of cephalexin, targeting gram-positive and gram-negative bacteria to combat fin rot, tail rot, columnaris, and ulcers. This trusted aquarium antibiotic is safe for freshwater and saltwater aquariums, helping maintain a healthy aquatic environment.

Shop More Fish Antibiotics

Key Benefits

✔ Broad-Spectrum Treatment – Effectively treats fin rot, tail rot, columnaris, gill disease, and septicemia.
✔ High-Potency Formula – Each 500mg capsule provides consistent and reliable bacterial infection treatment.
✔ Safe for Aquarium Use – Designed specifically for aquatic environments, minimizing harm to fish.
✔ Convenient Size – The 100-capsule pack is perfect for large aquariums or multiple treatments.
✔ Trusted Quality – Produced to high standards, ensuring purity and effectiveness.

Dosage Instructions

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

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.