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Fish Penicillin (Penicillin 250mg) is a powerful aquarium antibiotic designed to combat bacterial infections such as fin rot, body ulcers, and gill disease. Its fast-acting formula helps restore the health and vitality of your ornamental fish.
Add one 250mg tablet per 40 gallons of aquarium water. Repeat every 24 hours for 5–10 days, changing 25% of the water between doses. Discontinue if no improvement is observed within 5 days.
Store tightly closed at room temperature between 59°F and 86°F (15°–30°C). For ornamental fish use only. Keep out of reach of children.