Aquarium Penicillin

Browse our selection of Aquarium Penicillin, a classic antibiotic effective against many gram-positive bacterial infections in aquarium fish. Penicillin works by inhibiting bacterial cell wall synthesis.

Penicillin can be used to treat conditions such as:

• Fin rot
• Tail rot  
• Mouth rot
• Some skin ulcers

If you’re unsure if penicillin is the right treatment for your fish, we also offer other types of fish antibiotics, including:

• Amoxicillin
• Cephalexin
• Doxycycline
• Metronidazole
• Azithromycin
• Ciprofloxacin
• Clindamycin
• Sulfamethoxazole
• Fluconazole (While Fluconazole is an antifungal, it is included because it is sometimes used in conjunction with antibiotics.)

Here are some specific Penicillin products we carry:

• • Fish Penicillin – fish pen forte 500mg 60 capsules
  • Fish Penicillin – fish pen 500mg 30 capsules