Ingredient risk record
Nitrofurantoin
Also appears as: polymer bound nitrofurantoin
An antibacterial used against internal infections. It appears in this database mainly through Seachem Focus, which binds medication to food rather than dosing the water column — an approach the manufacturer specifically frames as a way to keep medication away from delicate plants and invertebrates.
Source-linked caution for
The evidence is formulation associated. It raises a warning on a product containing this ingredient but never decides the verdict.
“Using a medicated food mix will prevent damage to delicate plants or invertebrates from medication.”
manufacturer page · seachem.com · checked August 16, 2026
The inference only runs one way
A product containing nitrofurantoin gets a warning. But a product without it gets nothing — no clearance, no green tick. Fritz Algae Clean Out contains no copper and is still explicitly unsafe for shrimp and snails, which is why FishyMag will not certify a product as compatible unless the manufacturer says so directly.
Treatments containing nitrofurantoin
Next steps
FishyMag reports what manufacturers say, quoted and linked. It does not diagnose illness or recommend a treatment, and it never infers that a product is safe from the absence of a warning — where no statement exists, it says so.
Formulations change. Always read the label on the bottle in your hand, and contact the manufacturer if your tank contains anything valuable or unusual.