Fish Pen- Penicillin 250mg - Fish Antibiotic
Fish Pen™ (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.
*Drugs.com Pill Identifier is for reference use only. Fish and Bird medications are "not for human use", regardless if the medication is the same.