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 Don't risk outdated meds—compare your current product with the latest fish antibiotics expiration dates from trusted sources like Thomas Labs Pets.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