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Aquarium Cephalexin 250mg & 500mg – 100 Fish Antibiotic Capsules

Regular price $59.99

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Aquarium Cephalexin 250mg & 500mg – Powerful Fish Antibiotic

Aquarium Cephalexin is a powerful cephalosporin antibiotic formulated for ornamental aquarium fish. It is available in 250mg and higher-strength 500mg Forte options, with 100 capsules in every bottle.

Also commonly searched as Fish Cephalexin, Fish Flex and Fish Flex Forte, cephalexin provides antibacterial activity against susceptible bacteria associated with infections of the skin, fins, scales, wounds and other soft tissues.

Available Strengths

  • Aquarium Cephalexin 250mg: 100 capsules
  • Aquarium Cephalexin 500mg Forte: 100 capsules

The 250mg and 500mg selections contain the same active ingredient in different strengths. Select the strength specified by the verified product directions or recommended by a licensed aquatic veterinarian.

Powerful Cephalosporin Antibacterial Formula

Cephalexin is a first-generation cephalosporin antibiotic that interferes with the formation of susceptible bacterial cell walls. This antibacterial action makes it a recognized option for veterinarian-directed management of bacterial conditions involving the skin, fins, wounds and soft tissues of ornamental fish.

Cephalexin is an antibiotic and does not treat fungal diseases, viral infections, parasites or water-quality problems. Correctly identifying the underlying cause is essential before beginning treatment.

Bacterial Conditions Associated With Cephalexin Use

An aquatic veterinarian may select cephalexin for susceptible bacterial infections associated with:

  • Fin rot and bacterial fin deterioration
  • Tail rot and damaged fin tissue
  • Ulcers, sores and infected skin lesions
  • Open wounds and secondary bacterial infections
  • Scale loss with exposed or infected tissue
  • Bacterial skin and soft-tissue infections
  • Columnaris and bacterial mouth infections
  • Bacterial gill disease
  • Popeye associated with bacterial infection
  • Redness, inflammation and external bacterial disease
  • Systemic infections caused by susceptible bacteria

Product Specifications

  • Product: Aquarium Cephalexin
  • Active ingredient: Cephalexin
  • Available strengths: 250mg and 500mg per capsule
  • Package size: 100 capsules per bottle
  • Medication class: First-generation cephalosporin antibiotic
  • Product format: Capsules
  • Intended for: Ornamental aquarium fish

Professional Aquarium Treatment Practices

Whenever possible, transfer affected fish to a clean, well-aerated hospital or quarantine tank. Isolation allows closer observation, accurate aquarium-volume calculation and reduced medication exposure for healthy fish.

Check ammonia, nitrite, nitrate, pH, water temperature and dissolved oxygen before and during treatment. Poor water quality can produce symptoms resembling infection, weaken the fish and interfere with recovery.

Activated carbon, UV sterilization and certain chemical filtration systems may remove or deactivate aquarium medications. Adjust filtration only when required by the verified product directions or recommended by an aquatic veterinarian. Monitor biological filtration because antibiotics may affect beneficial nitrifying bacteria.

Use Aquarium Cephalexin exactly as directed on the original product label or by a licensed aquatic veterinarian. The correct strength, amount, administration method and treatment duration depend on the diagnosis, fish species, aquarium volume and water conditions.

Important Safety Information

  • For ornamental aquarium fish only.
  • Not for human consumption or human medical use.
  • Not for use in fish intended for human consumption.
  • Do not use in animals with a known cephalosporin or beta-lactam sensitivity unless professionally directed.
  • Do not combine with other medications unless directed by a veterinarian.
  • Keep out of reach of children and other animals.
  • Store according to the instructions printed on the original label.
  • Review all ingredients, warnings and directions before use.

Package contents: One bottle containing 100 Aquarium Cephalexin capsules in the selected 250mg or 500mg strength.

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.

Aquarium Cephalexin 250mg bottle containing 100 fish antibiotic capsulesAquarium Cephalexin 500mg Forte bottle containing 100 fish antibiotic capsules