Fish Pen (Penicillin) exerts a bactericidal action on gram-positive and some gram-negative bacteria. Penicillin is a broad spectrum antibiotic. It is effective against a number of pathogenic bacteria associated with ornamental fish diseases. Can use for pop-eyes, infected eyes, fin or tail rot, gill disease, columnaris disease, and skin ulcerations.

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10 mg/Kg (5 mg/lb) every 8 hours orally. Fish Pen is commonly given in off-label use to small animals. Use with caution in animals allergic to penicillin-like drugs.

Keep out of reach of children. For aquarium use only. Intended for ornamental fish and/or ornamental organisms, and not intended for use with fish for human consumption. For those allergic to penicillin, do not put hand in tank for three days after treatment.

250 mg Penicillin