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Fish Mox 500 mg 30 Capsules

$35.99 $45.99

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Check Mark Notice: Dog antibiotics sold out. Fish antibiotics (same grade & content) in stock — select “Fish” in variations to order.

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Fish Mox (Amoxicillin) 500mg – 30 Capsules

Fast-Acting Bacterial Infection Treatment for Aquarium Fish

Fish Mox (Amoxicillin) is a premium, broad-spectrum fish antibiotic trusted by aquarists to fight off stubborn bacterial infections in both freshwater and saltwater aquariums. Designed specifically for ornamental fish, this powerful treatment helps eliminate common conditions like fin rot, gill disease, body ulcers, and internal infections—supporting fast recovery and a balanced aquatic ecosystem.

👉 Explore more treatments in our Fish Antibiotics Collection

Key Benefits of Fish Mox Capsules

  • Broad-Spectrum Power: Effectively targets both gram-positive and gram-negative bacteria, including strains responsible for gill disease, skin ulcers, and fin rot.
  • Quick Dissolution: The 500mg capsules dissolve efficiently in tank water for rapid absorption.
  • Tank-Safe Formula: Specifically formulated for aquarium use—non-toxic to fish when dosed correctly.
  • Internal & External Infections: Reliable treatment for both systemic and surface-level bacterial infections.
  • Prevents Escalation: Stops bacterial spread before it progresses into severe, life-threatening conditions.

Need more details? Visit our About Us to learn why fishkeepers trust us.

When to Use Fish Mox (Amoxicillin) for Fish

Consider Fish Mox if your fish show any of the following:

  • Loss of appetite or abnormal swimming behavior
  • Visible red streaks or inflammation
  • Sores, lesions, or ulcers
  • Pop-eye or abdominal swelling
  • Fading colors or poor fin condition

Confirm that symptoms are bacterial—not fungal or parasitic—before beginning treatment.

Directions for Use

  • Dosage: Add one capsule (500mg) into the aquarium for every 20 gallons of water.
  • Frequency: Repeat every 24 hours.
  • Treatment Duration: 5 to 10 days, depending on severity.
  • Water Changes: Perform a 25% water change before each treatment. Use activated carbon after the course to clear residues.

For fast delivery, view our Shipping Policy.

Active Ingredient

Amoxicillin 500 mg – A potent penicillin-class antibiotic that disrupts bacterial cell wall synthesis, stopping infection growth.

Storage Guidelines

Store in a cool, dry environment (59°F–86°F or 15°C–30°C). Keep tightly closed and away from direct sunlight or humidity.

Important Warnings

  • Not for human use or fish intended for consumption
  • Do not use in tanks with invertebrates unless approved by an aquatic vet
  • Always monitor water conditions during treatment
  • Keep out of reach of children and household pets

For returns or exchanges, review our Refund Policy.

Product FAQs – Fish Mox (Amoxicillin) 500mg

  • What is Fish Mox used to treat?
    It treats bacterial infections like fin rot, gill disease, ulcers, dropsy, and other gram-positive infections in ornamental aquarium fish.
  • Can I use it in saltwater tanks?
    Yes. Fish Mox is safe for both freshwater and saltwater environments when used properly.
  • Will it affect good bacteria in the tank?
    Some minor impact is possible. We recommend adding probiotics after treatment.
  • Is it safe for fry or juvenile fish?
    Yes, but monitor closely and ensure the correct dosage is used to avoid stress.
  • Can I use it with shrimp or snails?
    No. Avoid use in tanks with sensitive invertebrates unless directed by a vet.
  • What should I do if there’s no improvement after 5 days?
    Stop treatment and consult an aquatic veterinarian immediately.
  • Can Fish Mox be combined with other meds?
    Do not mix with other antibiotics or treatments without professional guidance.
  • How should I prepare the tank before use?
    Remove charcoal filters and conduct a partial water change before the first dose.
  • What’s the best way to dispose of expired capsules?
    Follow your local guidelines—never flush them or discard in water systems.
  • Where can I get more help with using Fish Mox?
    Our customer care team is ready to assist at dogsantibiotics.com.

If you're looking to buy fish antibiotics online without a vet prescription, DogsAntibiotics.com is your go-to source for fast, discreet delivery and exceptional service.

Your order of 100$ 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.

Fish Mox 500 mg 30 CapsulesFish Amoxicillin 500mg – 100 Capsules Bottle of Fish Antibiotics

Fish Mox 500mg – 100 Capsules Bottle of Fish Antibiotics