Thomas Labs Fish Flex Forte (Cephalexin) is for use
in aquariums for the treatment of bacterial activity. Cephalexin is a
cephalosporin antibiotic and acts by inhibiting the synthesis of bacterial cell
wall, leading to cell death. Cephalexin is active against both
gram-positive and gram-negative bacteria. Resistance can develop among
some gram-negative rods (e.g., E. coli).
Fish: Add one capsule into aquarium
for each 20 gallons of water. Repeat in 24 hours. It is suggested that a
partial water change be made between treatments. While treatment duration
depends on the type and severity of infection, it is recommended that
extended baths in the medication continue for a minimum of 5 days and for
not more than 10 days. Discontinued treatment if no improvement is noted
within 5 days.