Fish Pen Forte™ (Penicillin V Potassium) from Thomas Labs is an antibiotic that exerts a bactericidal action on gram-positive and some gram-negative bacteria in fish. This fish antibiotic is useful for control of some common bacterial diseases in fish, including diseases caused by bacteria such as fin and tail rot and Flexibacter infections.

Directions For Use

Add one tablet into aquarium for every 20 gallons of water to be treated. Repeat in 24 hours. It is suggested that a partial water change is made between treatments. While the duration of treatment depends on type and severity of infection, it is recommended that extended medication baths continue for a minimum of 5 days and not for more than 10 days. Discontinue treatment if no improvement is noted within 5 days. 

Keep out of reach of children. Fish Antibiotics are for aquarium use only. Intended for ornamental fish and/or ornamental organisms, and not intended for use with fish that are intended for human consumption.

FDA inspected.