# Sulfamethoxazole/Trimethoprim for Fish (Fish Sulfa)

> Sulfamethoxazole and trimethoprim block two consecutive steps bacteria need to make folate. Used together they are more effective than either drug alone. Broad, with activity against many gram-positive and gram-negative bacteria.

Source: https://petremedyusa.com/medications/sulfa-antibiotics-for-fish/ · PetRemedyUSA

## Commonly used for

- General bacterial infections
- Fin rot and ulcers
- Backup option when a first antibiotic class has not worked

## Things to know

- People with sulfa allergies should avoid contact with the tablets and treated water.
- Not effective against parasites or fungi.
- Treat in a hospital tank where possible.

## Products

- [Fish Sulfa 960mg 100-Tablets](https://petremedyusa.com/products/fish-sulfa-960mg-100-tablets/): from $55.99
- [Fish Sulfa 960mg 60-Tablets](https://petremedyusa.com/products/fish-sulfa-960mg-60-tablets/): from $55.67

## Frequently asked questions

### What does the 960mg on Fish Sulfa mean?

It refers to the combined strength of the sulfamethoxazole and trimethoprim in each tablet. Follow the directions on the label for how much to use.