(Fish Pen Forte Equivalent) Fish Penicillin Plus - 500 mg - 100 count [DISCONTINUED]

Fish Penicillin Plus 100 Count is an antibiotic that exerts a bactericidal action on gram-positive and some gram-negative bacteria in fish. Used in the control of some common bacterial diseases in fish, including diseases caused by bacteria such as fin and tail rot and Flexibacter infections.

This product is USP grade and manufactured in the USA

Description: Fish Penicillin Plus 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

Available Sizes/Strengths

  • 250 mg 300 count  
  • 250 mg 100 count
  • 500 mg 30 count
  • 500 mg 100 count

Active Ingredients: Penicillin 500 mg


  • 500mg - 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. This product should not be given to fish intended for human consumption. Keep out of the reach of children and animals. Keep container tightly closed and in a cool dry place. In case of accidental overdose, contact a health professional immediately.