Penicillin exerts a bactericidal action on gram positive and some gram negative bacteria. Useful for the control of some common bacterial diseases of fish including fin and tail rot and flexibacter infections.
Add one tablet (500 mg) into aquarium for each 20 gallons of water to be treated. Repeat in 24 hours. It is suggested that a partial water change be made between treatments. While duration of treatment depends on type and severity of the infection, it is recommended that extended baths in the medication continue for a minimum of 5 days & for not more than 10 days. Discontinue treatment with this medication if no improvement is noted within 5 days.
Caution: For aquarium and ornamental fish only. Not for human use. Keep out of the reach of children. Keep container tightly closed and in a cool dry place. Not to be given to fish intended for food use.