Collection: Fish Antibiotics Penicillin

Thomas Labs Fish Antibiotics Penicillin – Targeted Treatment for Gram-Positive Bacterial Infections

When bacterial infections affect your aquarium fish, Fish Pen (Penicillin 250mg) and Fish Pen Forte (Penicillin 500mg) provide a reliable solution for treating gram-positive bacterial infections effectively.

As a narrow-spectrum antibiotic, Penicillin specifically targets gram-positive bacteria, making it a trusted choice for treating infections such as fin rot, tail rot, skin ulcers, and lesions.

At Thomas Labs Pet, we offer high-quality fish medications, ensuring your fish remain healthy and free from harmful bacterial infections. This product is part of our Fish Antibiotics collection and is also available in our Fish Medication category for comprehensive fish health solutions.


Why Choose Fish Penicillin from Thomas Labs Pet?

Targeted Antibiotic Treatment – Designed for bacterial infections caused by gram-positive bacteria.
Reliable & Proven Formula – Trusted by aquarists, breeders, and fish professionals.
Trusted Quality – We source our fish medications from reliable manufacturers like Thomas Labs.
Fast & Reliable Shipping – Get your fish antibiotics delivered quickly for immediate treatment.


Common Fish Diseases Treated with Penicillin (Fish Pen)

🐠 Certain Forms of Fin Rot & Tail Rot – Helps stop infection spread and supports tissue recovery.
🐠 Skin Ulcers & Lesions – Treats gram-positive bacterial infections affecting the fish’s skin.
🐠 Other Gram-Positive Bacterial Infections – Effective against susceptible bacterial strains in fish.

For severe infections or larger fish, consider Fish Pen Forte (Penicillin 500mg) for higher-strength treatment.


How to Use Fish Penicillin (Fish Pen & Fish Pen Forte)

📌 Dosage – Follow the instructions on the product label for accurate dosing based on aquarium size.
📌 Water Changes – Perform a 25-50% water change before treatment and between doses.
📌 Complete Treatment Course – Continue treatment as directed, even if symptoms improve.
📌 Quarantine Tank Recommended – Isolate infected fish to prevent disruption to your main aquarium’s biological filter.


Important Considerations Before Use

Ensure Proper DiagnosisPenicillin is only effective against gram-positive bacterial infections and will not work on gram-negative bacteria, viral, fungal, or parasitic infections.
Monitor Water Quality – Antibiotics may impact beneficial bacteria in your aquarium. Check ammonia, nitrite, and nitrate levels regularly.
Consult an Expert – If unsure about your fish’s illness, seek advice from an aquatic veterinarian.


Related Products – More Fish Treatment Options

🔹 Fish Pen Forte (Penicillin 500mg) – Higher-strength penicillin for severe infections.
🔹 Fish Mox (Amoxicillin) – A broad-spectrum antibiotic effective against some gram-negative and gram-positive bacteria.
🔹 Fish Flex (Cephalexin) – Alternative antibiotic for external bacterial infections.
🔹 Fish Zole (Metronidazole) – Best for internal parasites and protozoan infections.
🔹 Browse All Fish Antibiotics – Find the right medication for your fish’s needs.
🔹 Shop Fish Medication – Discover treatments for various fish ailments.


Shop Fish Penicillin Today!

Ensure your fish receive the best care with trusted aquarium antibiotics. Order Fish Pen (Penicillin 250mg) today for fast and effective treatment!